THE PATENTS ACT. 1970
(39 of 1970)
COMPELETE SPECIFICATION Section 10, rule I3|
PROCESS OF MANUFACTURING. OF AMINO PLAST GEL FOR WATER SHUT OFF
NOVA TRANSFERS PVT. LTD.,
B-8, ANAND CHS ,SITALADEVI TEMPLE ROAD,
MAHIM,MUMBAI-400016 MAHARASHTRA, INDIA
AN INDIAN COMPANY
The following specification particularly describes the nature of the invention and the manner in which it is to be performed.

TECHNICAL FIELD
This invention relates to a process of manufacturing of amino plast gel for water shut off.
BACKGROUND OF THE INVENTION
Amino plast gels have increasingly become important in the course of industrial development. These are being used in various fields like paper, textiles, coating and oil drilling.
Amino plasts are generally prepared by reacting primary/ secondary amines with formaldehyde and/or alkanols in presence of acid or alkaline catalysts. Various process parameters like temparature, catalysts, pH are monitored to get the desired product.
OBJECTIVE OF THE INVENTION
The main objective of the invention is to prepare gel with linear or branched amine and/or cyclic amine, paraformaldehyde and alkanolamine in presence of modifiers in varying proportions of amines under strictly alkaline conditions to get suitable product for the water shut off in oil wells.
DET AIL DESCRIPTION OF THE INVENTION
The process of manufacturing of linear amino plast gel for water shut off is carried out in three different stages. Linear amino plast and cylic amino plast are produced separately and then judicious combination of these two along with the
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other additives is prepared which can give strong, hard gel at high temperature
The present invention relates to a process of manufacturing of amino plast gel for water shut off comprising the following steps
a) By reacting linear amine with aldehydes like paraformaldehyde (2-3 mole) in the presence of alkali at pH 7-12 and 0.5% modifier. Initially mass is heated to 45 degree centigrade. The resultant exotherm is controlled by external cooling. The reaction temperature is controlled between 45- 75 degree centigrade for 1 to 3 hours. Alkaline pH is maintained through out the reaction. Product is cooled and stored
b) by reacting cyclic amine with aldehyde like paraformaldehyde ( 3.5-6 moles) and alkanols (3.5-5 moles) in the presence of alkali at pH 7 to 11 and modifiers 0.5 to 2%. Initially mass is heated to 40 degree centigrade and resultant exotherm is controlled by chilled water to maintain the temperature between 40 to 80 degree centigrade for the period of. 1.5 to 3 hours. Alkaline pH is maintained throughout the reaction to get cyclic amino plast followed by cooling
c) combination of the said linear amino plast 20-50 parts and cyclic amino plast 50 -80 parts are thoroughly mixed under continuous stirring in the presence of
modifiers in such a way that the resultant product along with 0 to 30 parts water gives white solid strong gel at pH 5 to 10 and between temperature range of 65 -120 degree centigrade
The process is carried out under neutral blanket.
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It has been found that precondensate starts at low, temperature of about 40 degree centigrade when 1 to 5% polyamine modifier is used in the preparation of the precondensate. It is very easy to control the exotherm due to addition of the modifier. Alkaline pH of 7 to 12 using strong alkali like NaOH, KOH smoothens progress of the polymerization. Final reaction is carried out at 60-75 C. Process time is reduced along with reduction in heat energy requirement.
Part esterification is carried out with alkanols of varying chain length.
REACTANTS USED IN THE PROCESS
1. Linear amines: Urea, Thiourea
2. Cyclic amines : Melamine, Benzoguanamine
3. Alkanols : Methanol ,Ethanol Jsopropyl Alcohol etc
4 .Modifiers : Hexamine. Diethanolarnine.MIBK, alkylamines
5.Alkalies : NaOH,ROH
6.Aldehydes :Paraformaldehyde, formaldehyde
REACTION CONDITION
Condensation reaction is carried out in alkaline condition between pH 7-12.Temparature is maintained between 40 to 80, degree centigrade, for linear or cylic amino resins. Reaction is carried out under normal or inert atmosphere.
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WE CLAIM:
1 The process of manufacturing of amino plast gel for water shut off comprises the following steps
a) reacting linear amine with 2-3 moles paraformaldehyde in the presence of alkali at pH 7 to 12 using modifier at 45 to 75 degree centigrade for a period of 1 to 3 hours followed by cooling to obtain linear amino plast,
b) reacting cylic amine with para- formaldehyde 3-6 moles and alkanol 3 to 5 moles in the presence of alkali at pH 7 to 11 using the modifier! 0.5 to 2%} at 40 to 80 degree centigrade for a period of 1 to 3 hours to get cyclic amino plast,
c) combination of the said linear amino plast obtained at step (a) 20 to 50 parts and the said cyclic amino plast 50 to 80 parts obtained at step (b) are thoroughly mixed in the presence of modifier to get a product which along with 0-30 parts water produces to find colourless solid ,strong gel at pH 5 to 10 at temperature 65 to 120 degree centigrade.
2. The process of manufacturing of amino plast gel for water shut off as claimed in claim 1 wherein the said pH 7 to 12 is maintained using alkali selected from NaOH, KOH
3 The process of manufacturing of amino plast gel for water shut off as claimed in claim 1 wherein the said modifier is alkyl amines.

ABSTRACT
The process of manufacturing of amino plast gel for sand consolidation comprising the following steps
a) Reacting linear amine with 2-3 moles paraformaldehyde in the presence of alkali at pH 7 to 12 using modifier at 45 to 75 degree centigrade for a period of 1 to 3 hours followed by cooling to obtain linear amino plast.
b) Reacting cylic amine with para- formaldehyde 3-6 moles and alkanol 3 to 5 moles in the presence of alkali at pH 7 to 11 using the modifier! 0.5 to 2%} at 40 to 80 degree centigrade for a period of 1 to 3 hours to get cyclic amino plast.
C) Combination of the said linear amino plast obtained at step (a 20 to 50 parts and the said cyclic amino plast 50 to 80 parts obtained at step (b) are thoroughly mixed in the presence of modifier to get a product which along with 0- 30 parts water produces to find colourless solid ,strong gel at pH 5 to 10 at temperature 65 to 120 degree centigrade
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