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Method For Recovering Alkali Metal Salt And Apparatus For Recovering Alkali Metal Salt
Abstract: The present invention is a method for recovering an alkali metal salt from a solution X that contains: a compound HA having a pKa value of 3.0-5.0 and/or an anion A that forms compound HA; and an alkali metal ion. The method includes: (1) a pH adjustment step for adjusting the pH of the solution X to 0-4.0 when the pH exceeds 4; (2) an aluminum salt addition step for adding an aluminum salt to the solution X so that the molar concentration of aluminum is at least 0.25 times the total molar concentration of anions A, which is the sum of the molar concentration of compound HA in the solution X and the molar concentration of anions A present as ions in the solution X; and (3) a nanofiltration step for separating alkali metal ions to the permeation side from the solution X by means of a nanofiltration membrane following step (1) and step (2).
Notices, Deadlines & Correspondence
Patent Information
Applicants
TORAY INDUSTRIES, INC.
Inventors
1. MIYAMOTO Ryoma
2. AOYAMA Shigeru
3. YOSHIZAKI Tomoya
Specification
Documents
Application Documents
| # | Name | Date |
|---|---|---|
| 1 | 202547101312-STATEMENT OF UNDERTAKING (FORM 3) [21-10-2025(online)].pdf | 2025-10-21 |
| 2 | 202547101312-REQUEST FOR EXAMINATION (FORM-18) [21-10-2025(online)].pdf | 2025-10-21 |
| 3 | 202547101312-PROOF OF RIGHT [21-10-2025(online)].pdf | 2025-10-21 |
| 4 | 202547101312-PRIORITY DOCUMENTS [21-10-2025(online)].pdf | 2025-10-21 |
| 5 | 202547101312-FORM 18 [21-10-2025(online)].pdf | 2025-10-21 |
| 6 | 202547101312-FORM 1 [21-10-2025(online)].pdf | 2025-10-21 |
| 7 | 202547101312-DECLARATION OF INVENTORSHIP (FORM 5) [21-10-2025(online)].pdf | 2025-10-21 |
| 8 | 202547101312-COMPLETE SPECIFICATION [21-10-2025(online)].pdf | 2025-10-21 |
| 9 | 202547101312-FORM-26 [22-10-2025(online)].pdf | 2025-10-22 |
| 10 | 202547101312-Proof of Right [23-10-2025(online)].pdf | 2025-10-23 |