JPS57114568A - Concentration of aqueous solution of lactam - Google Patents
Concentration of aqueous solution of lactamInfo
- Publication number
- JPS57114568A JPS57114568A JP16481A JP16481A JPS57114568A JP S57114568 A JPS57114568 A JP S57114568A JP 16481 A JP16481 A JP 16481A JP 16481 A JP16481 A JP 16481A JP S57114568 A JPS57114568 A JP S57114568A
- Authority
- JP
- Japan
- Prior art keywords
- lactam
- aqueous solution
- reverse osmosis
- osmosis membrane
- reducing agent
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Abstract
PURPOSE: To remove lactam from an aqueous solution of lactam in high rejection, and to reuse the separated pure water as industrial water, by adding a slight amount of a reducing agent to the aqueous solution, and concentrating the solution with a specific composite reverse osmosis membrane.
CONSTITUTION: A lactam-containing aqueous solution is concentrated with a reverse osmosis membrane. The aqueous solution is added with about 10W 100ppm of a reducing agent, and brought into contact under pressure with a reverse osmosis membrane consisting of (A) a semipermeable barrier layer having a thickness of about 0.01W0.1μ and composed of a crosslinked polymer containing a compound having isocyanurate structure of formula (R1 is glycidyl, etc.: R2 is H, 2W5C alkyl or R1) as a main component (the isocyanurate structure in the polymer is bonded through -O- and -COO- bonds) and (B) a porous substrate membrane supporting the semipermeable layer A. The rejection of lactam is as high as ≥about 95%.
COPYRIGHT: (C)1982,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP16481A JPS6021585B2 (en) | 1981-01-06 | 1981-01-06 | Method for concentrating lactam aqueous solution |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP16481A JPS6021585B2 (en) | 1981-01-06 | 1981-01-06 | Method for concentrating lactam aqueous solution |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS57114568A true JPS57114568A (en) | 1982-07-16 |
JPS6021585B2 JPS6021585B2 (en) | 1985-05-28 |
Family
ID=11466388
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP16481A Expired JPS6021585B2 (en) | 1981-01-06 | 1981-01-06 | Method for concentrating lactam aqueous solution |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS6021585B2 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2013119539A (en) * | 2011-12-08 | 2013-06-17 | Unitika Ltd | METHOD FOR PURIFYING RECOVERED ε-CAPROLACTAM |
-
1981
- 1981-01-06 JP JP16481A patent/JPS6021585B2/en not_active Expired
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2013119539A (en) * | 2011-12-08 | 2013-06-17 | Unitika Ltd | METHOD FOR PURIFYING RECOVERED ε-CAPROLACTAM |
Also Published As
Publication number | Publication date |
---|---|
JPS6021585B2 (en) | 1985-05-28 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
US4950404B1 (en) | ||
GB8530028D0 (en) | Porous fluorine resin membrane | |
EP0798036A3 (en) | Highly permeable composite reverse osmosis membrane and a reverse osmosis membrane module using the same | |
JPS5621604A (en) | Separation of liquid by semipermeable composite membrane | |
JPS54151570A (en) | Selectively permeable composite membrane and its manufacture | |
JPS5712802A (en) | Water extraction system using permeable membrane | |
IL70166A0 (en) | Composite material,its manufacture and its use in osmotic purification of liquids | |
JPS56126408A (en) | Semipermeable membrane and its production | |
US3721623A (en) | Method of improving the salt rejection of semipermeable reverse osmosis membranes | |
JPS57114568A (en) | Concentration of aqueous solution of lactam | |
DE3564077D1 (en) | Semipermeable composite membrane | |
JPS5599934A (en) | Preparation of porous vinylidene fluoride resin membrane | |
JPS57159587A (en) | Sterilization and purification of water | |
JPS5621605A (en) | Separation of liquid by semipermeable composite membrane consisting of furufryl alcohol polymer | |
JPS57106683A (en) | Method for concentrating beta-lactam antibiotic substance | |
JPS52143961A (en) | Treatment of solution containing acids or alkalis and/or salts | |
JPS5724602A (en) | Selective separation of aqueous solution containing water-soluble valuable | |
GB2011828A (en) | Acrylonitrile polymer semipermeable membranes | |
JPS531178A (en) | Separation spcecificity recovering method of membrane | |
JPS553809A (en) | Dynamic membrane formation supporter and its manufacture | |
JPS57184404A (en) | Preparation of semi-permeable film | |
JPS52143962A (en) | Treatment of solution | |
JPS56139105A (en) | Semipermeable composite membrane and its manufacture | |
JPS5712801A (en) | Dynamic membrane for water treatment | |
JPS5791707A (en) | Composite semipermeable membrane and method for producing the same |