TECHNICAL FIELD [0001] The present invention relates to a purification method of a aldehyde compound, a manufacturing method of an aldehyde compound including the purification method as a step, and a manufacturing 10 method of an amine compound and a manufacturing method of an isocyanate compound that use an aldehyde compound obtained by the aforementioned manufacturing method. BACKGROUND ART [0002] 15 As a manufacturing method of an aldehyde compound using a norbornene compound, for example, the methods described in Patent Documents 1 to 3 are known. Patent Documents 1 to 3 disclose methods for manufacturing formyl cyan norbornane by hydroformylating cyan norbornene by using 20 a mixed gas of H2/CO in the presence of a catalyst. Patent Documents 1 and 2 disclose an example in which a metal compound is used as a catalyst. Herein, because a target compound can be obtained with a high degree of selectivity, and a reaction pressure can be kept low, a rhodium complex is preferably used as a catalyst. 25 [0003] Patent Document 4 describes a metal ligand complex catalyst. In this document, rhodium is exemplified as a metal, and an organic 2 phosphorus ligand is exemplified as a ligand. [0004] Patent Document 5 discloses a method for treating a solution, which contains a trivalent phosphorus compound, a rhodium compound, 5 and an aldehyde compound, that is for recovering the rhodium metal. In the document, hydrolysis using water and a base compound such as NaOH is used. RELATED DOCUMENT PATENT DOCUMENT 10 [0005] [Patent Document 1] Japanese Laid-open Patent Publication No. 57-193438 [Patent Document 2] Japanese Laid-open Patent Publication No. 60-72844 15 [Patent Document 3] US Patent No. 3,143,570 [Patent Document 4] Japanese Translation of PCT International Application No. 2003-505438 [Patent Document 5] Japanese Laid-open Patent Publication No. 6-49554 20 DISCLOSURE OF THE INVENTION [0006] The present inventors found that when an amine compound is synthesized by imino-hydrogenating an aldehyde compound, if a 25 compound derived from a phosphorus compound used for a hydroformylation reaction remains, yield of the reaction is reduced. In order to improve the yield of the reaction, after the 3 hydroformylation reaction, the obtained aldehyde compound and the compound derived from the phosphorus compound need to be separated beforehand. [0007] 5 However, when the boiling point of the aldehyde compound is close to the boiling point of the compound derived from the phosphorus compound, it is difficult to separate the compounds by distillation in some cases. Furthermore, when the phosphorus compound is hydrolyzed such that it can be separated by distillation, the solution 10 becomes acidic, and thus the aldehyde compound loses stability in some cases. In addition, when the acidic solution obtained after the hydrolysis is neutralized with a base compound, so as to improve the stability of the aldehyde compound, the base compound causes polymerization/decomposition of the aldehyde compound, and thus the 15 stability deteriorates in some cases. For this reason, the present invention aims to establish a purification technique of an aldehyde compound that separates an aldehyde compound and a compound derived from a phosphorus compound while maintaining stability of the aldehyde compound as a target 20 substance. [0008] As a result of performing intensive examination to solve the above problem, the present inventors found a method for separating a compound derived from a phosphorus compound while maintaining 25 stability of an aldehyde compound by using a predetermined base compound. [0009] 4 The present invention includes the following. [1] A purification method of an aldehyde compound, including a step of neutralizing a reaction solution containing an aldehyde compound by adding water and a base compound to the reaction solution, 5 and a step of distilling the neutralized reaction solution, in which the reaction solution is obtained by reacting a compound represented by the following Formula (al) or (a2) with hydrogen and carbon monoxide in the presence of a metal compound of groups 8 to 10 and a phosphorus compound, the phosphorus compound is represented by the following 10 Formula (F^O^P, and the base compound is at least one kind selected from among carbonate and hydrogen carbonate of metals of group I on the periodic table and carbonate and hydrogen carbonate of metals of group II on the periodic table, 15 (in Formula (al), X represents a hydrogen atom, a cyano group, an aldehyde group, or a -CH=NR group; R represents a hydrogen atom, 5 an alkyl group having 1 to 6 carbon atoms, or an aryl group; and in Formulae (al) and (a2), n represents 0, 1, or 2), (R'OhP fin the formula, a plurality of F^s may be the same as or different 5 from each other, and represents an alkyl group having 1 to 16 carbon atoms that may have a substituent or an aryl group having 6 to 16 carbon atoms that may have a substituent). [0010] [2] The purification method of an aldehyde compound described 10 in [1], in which the base compound is potassium hydrogen carbonate or potassium carbonate. [3] The purification method of an aldehyde compound descried in [1] or [2], in which the phosphorus compound is at least one kind selected from the group consisting of triphenyl phosphite, trimethyl 15 phosphite, triethyl phosphite, tripropyl phosphite, triisopropyl phosphite, trimethylphenyl phosphite, and tris(2,4-di-tert-butylphenyl)phosphite. [4] The purification method of an aldehyde compound described in any one of [1] to [3], in which the metal compound of groups 8 20 to 10 is a rhodium compound, a cobalt compound, a ruthenium compound, or an iron compound. [0011] [5] The purification method of an aldehyde compound described in any one of [1] to [3], in which the metal compound of groups 8 25 to 10 is a rhodium compound. [6] The purification method of an aldehyde compound described in any one of [1] to [5], in which a compound represented by the Formula 6 (al) is used, and the compound is a compound represented by the following Formula (1), (in Formula (1) , X has the same definition as X in Formula (al) ) . [7] The purification method of an aldehyde compound described in any one of [1] to [6] , in which the step of neutralizing the reaction solution is performed within a temperature range of equal to or higher than 40°C and equal to or lower than 50°C. [0012] [8] A manufacturing method of an aldehyde compound, including a step of obtaining a reaction solution containing an aldehyde compound by reacting a compound represented by the following Formula (al) or (a2) with hydrogen and carbon monoxide in the presence of a metal compound of groups 8 to 10 and a phosphorus compound, a step of neutralizing the reaction solution by adding water and a base compound to the reaction solution, and a step of purifying an aldehyde compound by distilling the neutralized reaction solution, in which the phosphorus compound is represented by the following Formula (I^O) 3P, and the base compound is at least one kind selected from among carbonate and hydrogen carbonate of metals of group I on the periodic table and carbonate and hydrogen carbonate of metals of group II on the periodic table, 5 (in Formula (al), X represents a hydrogen atom, a cyano group, an aldehyde group, or a —CH=NR group; R represents a hydrogen atom, an alkyl group having 1 to 6 carbon atoms, or an aryl group; and in Formulae (al) and (a2), n represents 0, 1, or 2}, (R'OhP 10 (in the formula, a plurality of R1s may be the same as or different from each other, and represents an alkyl group having 1 to 16 carbon atoms that may have a substituent or an aryl group having 6 to 16 carbon atoms that may have a substituent). [0013] 15 [9] The manufacturing method of an aldehyde compound described in [8], in which the base compound is potassium hydrogen carbonate or potassium carbonate. [10] The manufacturing method of an aldehyde compound described in [8] or [9], in which the phosphorus compound is at least,one kind selected from the group consisting of triphenyl phosphite, trimethyl phosphite, triethyl phosphite, tripropyl phosphite, triisopropyl phosphite, trimethylphenyl phosphite, and tris(2,4~di-tert-butylphenyl)phosphite. 5 [11] The manufacturing method of an aldehyde compound described in any one of [8] to [10], in which the metal compound of groups 8 to 10 is a rhodium compound, a cobalt compound, a ruthenium compound, o,r an iron compound. [12] The manufacturing method of an aldehyde compound described 10 in any one of [8] to [10], in which the metal compound of groups 8 to 10 is a rhodium compound. [0014] [13] The manufacturing method of an aldehyde compound described in any one of [8] to [12], in which a compound represented by the 15 Formula (al) is used, and the compound is a compound represented by the following Formula (1), (in Formula (1) , X has the same definition as X in Formula (al) ) . 20 [14] The manufacturing method of an aldehyde compound described in any one of [8] to [13], in which the step of neutralizing the reaction solution is performed within a temperature range of equal to or higher than 40°C and equal to or lower than 50°C. 9 [15] A manufacturing method of an amine compound, including a step of reacting an aldehyde compound obtained by the manufacturing method described in any one of [8] to [14] with ammonia and with hydrogen in the presence of a catalyst. 5 [16] A manufacturing method of an isocyanate compound, including a step of reacting an amine compound obtained by the manufacturing method described in [15] with a carbonylating agent. [0015] In the present invention, a "phosphorus compound" refers to a 10 phosphorus compound that can form a complex with a metal compound, and includes any of a phosphorus compound having formed a complex with a metal compound and a free phosphorus compound. Furthermore, in the present invention, when a substance B is used in an amount of 1 * 10~6 mol with respect to 1 mol of a substance 15 A, the amount of the substance B is described as 1 ppmmol. EFFECT OF THE INVENTION [0016] According to the purification method of an aldehyde compound 20 of the present invention, it is possible to separate a compound derived from a phosphorus compound while maintaining stability of an aldehyde compound. Consequentially, it is possible to obtain an aldehyde. compound, from which the compound derived from the phosphorus compound has been separated and removed, while maintaining the yield. 25 [0017] The manufacturing method of an aldehyde compound, the manufacturing method of an amine compound, and the manufacturing 10 method of an isocyanate compound using the amine compound obtained by the aforementoned manufacturing method of the present invention include the purification method of an aldehyde compound as a step. Accordingly, the manufacturing methods are excellent in productivity 5 and yield of the target compounds. BRIEF DESCRIPTION OF THE DRAWINGS [0018] The aforementioned object, other objects, characteristics, and 10 advantages become clearer by preferable embodiments described below and the following drawings accompanied by the embodiments. [0019] FIG. 1 is a 1H-NMR chart of a compound obtained in Example 1. FIG. 2 is a 1H-NMR chart of a compound obtained in Example 6. 15 FIG. 3 is a XH-NMR chart of a compound obtained in Example 7. DESCRIPTION OF EMBODIMENTS [0020] Hereinafter, a manufacturing method of an aldehyde compound, 20 a manufacturing method of an amine compound, and a manufacturing method of an isocyanate compound of the present embodiment will be described in this order. Herein, a purification method of an aldehyde compound of the present embodiment will be described in the manufacturing method of an aldehyde compound. 25 [0021] Manufacturing method of aldehyde compound> The manufacturing method of an aldehyde compound of the present 11 embodiment includes a step of reacting a compound represented by the following Formula (al) or (a2) with hydrogen and carbon monoxide in the presence of a metal compound of groups 8 to 10 and a predetermined phosphorus compound. 5 [0022] [0024] 10 In Formula (al), X represents a hydrogen atom, a cyano group, an aldehyde group, or a -CH=NR group, and R represents a hydrogen atom, an alkyl group having 1 to 6 carbon atoms, or an aryl group. X is preferably a cyano group or an aldehyde group, and more preferably a cyano group. In Formulae (al) and (a2), n represents 0, 1, or 2.. 15 n is preferably 0 or 1, and more preferably 1. The compound represented by Formula (al) may be any of an endo-isomer and an exo-isomer, or may be a mixture containing these isomers at any ratio. [0025] 12 Specific examples of the compound represented by Formula (al) include the following compounds. (1) Examples of the compound in which n is 0 include cyclohexene, 4-cyano-1-cyclohexene, 3-cyclohexene-1-carboxyaldehyde, and 5 4-iminomethyl-l-cyclohexene. (2) Examples of the compound in which n is 1 include bicyclo[2.2.1]-2-heptene, bicyclo[2.2.1]—5-heptene-2-carbonitrile, bicyclo[2.2.1]-5-heptene-2-carboxyaldehyde, and bicyclo[2.2.1]-5-hepten-2-yl methanamine. 10 (3) Examples of the compound in which n is 2 include bicyclo[2.2.2]-2-octene, bicyclo[2.2.2]-5-octene-2-carbonitrile, bicyclo[2.2.2]-5-octene-2-carboxyaldehyde, and bicyclo[2.2.2]-5-hepten-2-yl methanamine. [0026] 15 Examples of the compound represented by Formula (a2) include the following compounds. (1) Examples of the compound in which n is 0 include 1,4-cyclohexadiene. (2) Examples of the compound in which n is 1 include 20 bicyclo[2.2.1]hepta-2,5-diene. (3) Examples of the compound in which n is 2 include bicyclo[2.2.2]octa-2,5-diene. [0027] In the present embodiment, it is preferable to use the compound 25 represented by Formula (al) , and it is more preferable for n to be 1. Specifically, as such a compound, a compound represented by the following Formula (1) can be preferably used. In Formula (1) , X has the same definition as X in Formula (al) . 5 X is preferably a cyano group or an aldehyde group, and more preferably a cyano group. Herein, the compound represented by Formula (1) may be any of an endo-isomer and an exo-isomer, and may be a mixture containing these isomers at any ratio. 10 [0030] The metal compound of groups 8 to 10 used in the reaction of the present embodiment is a rhodium compound, a cobalt compound, a ruthenium compound, or an iron compound. [0031]. 15 Examples of the rhodium compound include Rh(acac)(CO)2/ Rh(acac)3, RhCl(CO) (PPh3) 2, RhCl(PPh3)3, RhBr (CO) (PPh3) 2, Rh2 (CO) 8, Rh4(CO)12, Rh6(CO)i6, and the like. Examples of the cobalt compound include HCo(CO)3, HCo(CO)4, Co2(CO)8, HCo3 (CO) 9, and the like. Examples of the ruthenium compound include Ru(CO)3 (PPh3) 2l 20 RuCl2(PPh3)3, RuCl3(PPh3)3, Ru3(CO}i2, and the like. Examples of the iron compound include Fe(CO)5, Fe(CO)4PPh3, Fe (CO) 4 (PPh3) 2, and the like. Herein, "acac" means acetylacetonate. [0032] 14 The rhodium compound used in the reaction of the present embodiment is not particularly limited as long as it is a compound containing monovalent rhodium metal, and examples thereof include rhodium carbonyl catalysts such as dicarbonyl acetylacetonate 5 rhodium (Rh(acac) (CO)2) , dodecacarbonyl tetrarhodium (Rh4 (CO) i2) , hexadecacarbonyl hexarhodium (Rh6(CO)i6), and octacarbonyl rhodium (Rh2(CO)8); rhodium chloride; and the like. [0033] The phosphorus compound used in the reaction of the present 10 invention is represented by the following Formula. (R'ojsP In the formula, a plurality of R1s may be the same as or different from each other, and represents an alkyl group having 1 to 16 carbon atoms that may have a substituent or an aryl group having 6 to 16 15 carbon atoms that may have a substituent. Examples of" the substituent of the alkyl group having 1 to 16 carbon atoms or the aryl group having 6 to 16 carbon atoms include an alkyl group having 1 to 6 carbon atoms, an alkoxy group having 1 to 6 carbon atoms, an alkenyl group having 1 to 6 carbon atoms, 20 a hydroxyl group, an amino group, a cyano group, and the like. In the present embodiment, R1 is preferably an aryl group having 6 to 16 carbon atoms that may have a substituent. [0034] Specific examples of the phosphorus compound include trivalent 25 phosphorus compounds such as triphenyl phosphite, trimethyl phosphite, triethyl phosphite, tripropyl phosphite, triisopropyl phosphite, trimethylphenyl phosphite, and 15 tris(2, 4-di-tert-butylphenyl)phosphite. One kind of these can be used singly, or two or more kinds thereof can be used in combination. A hydroformylation reaction using these raw materials can be performed such that it satisfies the following condition (1), the 5 condition (2) , and/or the condition (3) . In the present embodiment, it is preferable for the reaction to satisfy two conditions including the condition (1) and the condition (2). [0035] (1) The amount of the metal of groups 8 to 10 included in the 10 metal compound of groups 8 to 10 is 0.01 ppmmol to 300 ppmmol, preferably 0.15 ppmmol to 100 ppmmol, more preferably 0.5 ppmmol to 100 ppmmol, and particularly preferably 1 ppmmol to 100 ppmmol, with respect to 1 mol of the compound represented by Formula (al) or (a2) . (2) A molar ratio of the phosphorus compound (mol)/the metal 15 of groups 8 to 10 (mol) contained in the metal compound of groups 8 to 10 is equal to or greater than 100, preferably equal to or greater than 150, and more preferably equal to or greater than 200 . The upper limit thereof is not particularly limited. However, from the viewpoint of the aforementioned effects, the upper limit is equal 20 to or less than 1,000,000, preferably equal to or less than 100,000, more preferably equal to or less than 50,000, and particularly preferably equal to or less than 10,000. The lower limit and the upper limit can be combined in any way. (3) A molar ratio of the phosphorus compound (mol)/the compound 25 represented by Formula (al) or (a2) (mol) is 0 . 003 to 0. 05, preferably 0.003 to 0.03, and more preferably 0.003 to 0.02. Herein, the range of the numerical values of the conditions (1) 16 to (3) can be combined in any way. [0036] The method satisfying such conditions can achieve excellent productivity of an aldehyde compound and can obtained high yield, 5 even when the amount of the metal of groups 8 to 10 is reduced. Presumably, because the amount of the phosphorus compound used is increased, the activity of the metal compound of groups 8 to 10 is improved more than expected, hence the aforementioned effects are obtained. It is also considered that the compound represented by 10 Formula (al) or (a2) exerts a strong steric or electronic influence, hence the aforementioned effects are obtained. [0037] Specifically, an aldehyde compound can be synthesized in the following manner. 15 First, a rhodium compound, a phosphorus compound, and the compound as a raw material represented by Formula (al) or (a2) are put into a reactor. Then hydrogen and carbon monoxide gas are supplied into the reactor, and in this state, a hydroformylation reaction can be performed at a temperature of 30°C to 120°C under 20 a pressure of 0.1 MPa to 1.0 MPa for a reaction time of 1 hour to 8 hours. Herein, a uniform reaction system including only an oil phase or a double layer reaction system including a water layer and an oil layer can be appropriately selected to perform the hydroformylation reaction. 25 In this way, the compound represented by Formula (al) or (a2) is hydroformylated, and an aldehyde compound is synthesized. [0038] 17 The hydroformylation reaction can be performed without using a solvent, and can use a substituted or unsubstituted aromatic compound, a substituted or unsubstituted aliphatic hydrocarbon compound, or an alcohol. The hydroformylation reaction can be 5 performed in a solvent such as toluene, benzene, hexane, octane, acetonitrile, benzonitrile, o-dichlorobenzene, ethanol, pentanol, or octanol. The hydroformylation reaction of the present embodiment exhibits excellent reactivity at a high concentration. Accordingly, the hydroformylation reaction can be performed without using a 10 solvent. As a result, a step of evaporating a solvent and the like become unnecessary, hence the reaction is performed by a simple step. Furthermore, the volume efficiency is improved, and the production efficiency becomes excellent. [0039] 15 By the manufacturing method of the present embodiment, an aldehyde compound represented by the following Formula (bl) is synthesized from the compound of Formula (al). Moreover, from the compound of Formula (a2), an aldehyde compound represented by the following Formula (b2) is synthesized. [0042] When n is 1 or 2, and X is a group other than a hydrogen atom, the compound represented by Formula (bl) or (b2) can be obtained in 5 the form of either a "compound in which the 2-position and the 5-position have been substituted with a predetermined group (hereinafter, the compound will be referred to as a "2,5-isomer")" or a "compound-in which the 2-position and the 6-position have been substituted with a predetermined group (hereinafter, the compound 10 will be referred to as a "2, 6-isomer")", or can be obtained in the form of a mixture containing these isomers at any ratio. Depending on the steric configuration of the substituent, each of the 2, 5-isomer and the 2, 6-isomer can be obtained in any form including an endo-endo isomer, an endo-exo-isomer, and an exo-exo-isomer, or can be obtained 15 in the form of a mixture containing at least two kinds of these isomers at any ratio. Herein, when n is 0, and X is a group other than a hydrogen atom, the compound represented by Formula (bl) or (b2) can be obtained in the form of either a cis-isomer or a trans-isomer, or can be obtained 20 in the form of a mixture containing these isomers as any ratio. In Formula, (bl) or (b2), X and n have the same definition as X in Formula (al) or (a2). [0043] In the present embodiment, the compound represented by Formula 19 (bl) is preferably obtained, and examples of such a compound include a compound represented by the following Formula (2). [0044] 5 [0045] In Formula (2), X has the same definition as X in Formula (1) . Herein, the aldehyde compound represented by Formula (2) can be obtained in the form of either a "compound in which the 2-position of bicyclo[2.2.l]heptane has been substituted with the substituent 10 X and the 5-position thereof has been substituted with an aldehyde group (hereinafter, the compound will be referred to as a "2,5-isomer")" or a "compound in which the 2-position has been substituted with che substituent X and the 6-position has been substituted with an aldehyde group (hereinafter, the compound will 15 be referred to as a "2,6-isomer")", or can be obtained in the form of a mixture containing these isomers at any ratio. Furthermore, depending on the steric configuration of the substituent, each of the 2, 5-isomer and the 2, 6-isomer can be obtained in any form including an endo-endo isomer, an endo-exo-isomer, and an exo-exo-isomer, or 20 can be obtained in the form of a mixture containing at least two kinds of these isomers at any ratio. After the hydroformylation reaction ends, a target aldehyde 20 compound can be obtained by performing a purification step which will be described later. [0046] 5 The purification method of an aldehyde compound of the present embodiment includes a step of neutralizing a reaction solution, which contains the aldehyde compound obtained as above, by adding water and the following base compound to the reaction solution, and a step of distilling the neutralized reaction solution. 10 The reaction solution which contains the aldehyde compound contains the aldehyde compound represented by the Formula (bl) or (b2) , a phosphorus compound, and a compound containing rhodium. In the present embodiment, the "compound containing rhodium" also includes any of a compound in the form of a complex consisting of 15 the rhodium compound added as a raw material, the phosphorus compound, CO/H2 and a free" rhodium compound. [0047] When water and a base compound are added to the reaction solution, water and an aqueous solution of a base compound may be added, or 20 only a solution containing a base compound may be added. The amount of water to be mixed is 2.0% by mass to 10.0% by mass, preferably 5.0% by mass to 9.0% by mass, more preferably 6.0% by mass to 9.0% by mass, with respect to the total amount of the solution of the mixture.. This is the total amount of water and water of the 25 aqueous solution of a base compound. In the present embodiment, the base compound used in the reaction is at least one kind selected from among carbonate and hydrogen 21 carbonate of metals of group I on the periodic table and carbonate and hydrogen carbonate of metals of group II on the periodic table. [0048] Examples of the base compound include sodium hydrogen carbonate, 5 sodium carbonate, potassium hydrogen carbonate, potassium carbonate, calcium carbonate, magnesium carbonate, and the like. Herein, at a point in time when the base compound has been added, i;n some cases, a reaction product (impurities) derived from the base compound and the phosphorus compound is precipitated, or 10 alternatively, a reaction product (impurities) is precipitated similarly to the still residue remaining after distillation. Accordingly, from the viewpoint of industrial process, it is preferable to use potassium hydrogen carbonate or potassium carbonate as the base compound. If such bases containing potassium are used, 15 the precipitation of the aforementioned reaction product (impurities) can be inhibited. Particularly, potassium carbonate exhibits high solubility in water and makes it possible to prepare a high-concentration aqueous solution. Potassium carbonate can increase neutralization 20 efficiency from the viewpoint described above, and availability thereof is high. Therefore, it can also be suitably used for mass production. [0049] Specifically, purification of an aldehyde compound can be 25 performed as below. A mixture of a compound containing rhodium, a phosphorus compound, and a compound represented by Formula (bl) or (b2) is put 22 into a reactor. Then water is added thereto, and the resultant is treated for a reaction time of 2 hours to 10 hours under normal pressure at a temperature of 40°C to 80°C, preferably at 40°C to 50°C. Thereafter, an aqueous solution of a base compound was added 5 thereto to perform a neutralization treatment. The conditions of the neutralization treatment can be appropriately set according to the manufacturing scale and the like. However, the neutralization treatment is preferably performed within a temperature range of equal to or higher than 40°C and equal to or lower than 50CC. Furthermore, 10 the pressure condition is preferably set to be a normal pressure, and the neutralization is preferably performed for a reaction time of 1 hour to 2 hours. Moreover, in the present embodiment, after the neutralization treatment, distillation and purification are performed under a 15 reduced pressure. By these steps, it is possible to suitably separate a compound derived from a phosphorus compound while maintaining stability of the aldehyde compound represented by Formula (bl) or (b2). Consequentially, it is possible to obtain an aldehyde compound, from 20 which a compound derived from a phosphorus compound has been separated and removed, while maintaining the yield of the aldehyde compound obtained by the preceding step. In addition, in the purification step of the present embodiment, after water is added and a heating treatment is performed, an aqueous 25 solution of a base compound is added. At this time, if the aqueous solution of a base compound is added within the aforementioned temperature range, it is possible to efficiently neutralize the 23 reaction system without the need to excessively cool the reaction system. That is, if neutralization is performed within the aforementioned temperature range, it is possible to improve the production efficiency while maintaining stability of the aldehyde 5 compound. The manufacturing method of an amine compound of the present embodiment that will be described later and the manufacturing method of an isocyanate compound using an amine compound obtained by the aforementioned manufacturing method includes the purification method 10 of an aldehyde compound as a step. Accordingly, the manufacturing methods are excellent in productivity and yield of the target compounds. [0050] Manufacturing method of amine compound> 15 The manufacturing method of an amine compound of the present embodiment includes the following steps. Step (a) : a step of reacting a compound represented by the Formula (al) or (a2) with hydrogen and carbon monoxide in the presence of a metal compound of groups 8 to 10 and a phosphorus compound 20 Step (b): a step of reacting an aldehyde compound obtained by Step (a) with ammonia and with hydrogen in the presence of a catalyst [0051] The manufacturing method of an amine compound of the present embodiment includes the aforementioned manufacturing method of an 25 aldehyde compound as in Step (a). Therefore, in Step (a), the productivity and yield of the aldehyde compound are excellent, and as a result, the productivity and yield of an amine compound as a 24 target compound also become excellent. Herein, because Step (a) is the same as the step in the "manufacturing method of an aldehyde compound", description of this step will not be repeated. 5 [0052] In step (b) , the aldehyde compound represented by the Formula (al) or (a2) that is obtained by Step (a) is iminated by being reacted with ammonia, and hydrogen is added thereto in the presence of a catalyst. In this way, an amine compound is synthesized. 10 [0053] As the catalyst, a metal catalyst such as nickel, platinum, palladium, or ruthenium, and the like can be used. When the aldehyde compound has a cyano group as a substituent, a -CH2-NH2 group is generated by hydrogen reduction. 15 In this way, in Step (b), the aldehyde group of the aldehyde compound becomes" an amino group by imination, and the cyano group also becomes an amino group by hydrogen reduction. Consequentially, an amine compound represented by the following Formula (cl) having two amino groups is synthesized. Herein, when the aldehyde compound 20 represented by Formula (bl) in which X is a hydrogen atom is used, an amine compound represented by the following Formula (c2) is synthesized. [0054] [0056] In Formula (cl) or (c2) , n has the same definition as n in Formula 5 (al) or The manufacturing method of an isocyanate compound of the present embodiment: includes the following steps. Step (a) : a step of reacting a compound represented by the Formula 20 (al) or (a2) with hydrogen and carbon monoxide in the presence of a metal compound of groups 8 to 10 and a phosphorus compound Step (b) : a step of reacting an aldehyde compound obtained by Step fa) with ammonia and with hydrogen in the presence of a catalyst Step (c) : a step of reacting an amine compound obtained by Step 25 (b) with a carbonylating agent [0062] The manufacturing method of an isocyanate compound of the 28 present embodiment includes the aforementioned manufacturing method of an aldehyde compound as Step (a). Therefore, in Step fa), the productivity and yield of the aldehyde compound are excellent, and as a result, the productivity and yield of an isocyanate compound 5 as a target compound also become excellent. [0063] Herein, Step (a) is the same as the step in the "manufacturing method of an aldehyde compound", and Step (b) is the same as the step in the "manufacturing method of an amine compound". Therefore, 10 description of Step (a) and Step (b) will not be repeated. [0064] In Step (c) , the amine compound represented by Formula (cl) or (c2) obtained by Step (b) is reacted with a carbonylating agent under predetermined conditions, whereby an isocyanate compound represented 15 by the following Formula (dl) or (d2) is synthesized. As-the carbonylating agent, phosgene, a urea derivative, a carbonate derivative, carbon monoxide, or the like can be used. [0065] 20 n in Formula (dl) or (d2) has the same definition as n in Formula (al) or