JPS5594933A - Purification of polycaproamide - Google Patents
Purification of polycaproamideInfo
- Publication number
- JPS5594933A JPS5594933A JP264679A JP264679A JPS5594933A JP S5594933 A JPS5594933 A JP S5594933A JP 264679 A JP264679 A JP 264679A JP 264679 A JP264679 A JP 264679A JP S5594933 A JPS5594933 A JP S5594933A
- Authority
- JP
- Japan
- Prior art keywords
- polycaproamide
- permeate
- chips
- reverse osmosis
- osmosis membrane
- 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.)
- Pending
Links
Landscapes
- Polyamides (AREA)
Abstract
PURPOSE: To enhance a recovery rate of monomers of polycaproamide and to enable to extend life time of a reverse osmosis membrane by separating a refined waste solution of polycaproamide chips by a reverse osmosis membrane method into a concentrated solution and a permeate.
CONSTITUTION: Polycaproamide chips are refined by warm water to extract monomers and an obtained refined waste solutin containing monomers is cooled, and thereafter generated precipitate is filtered. By this cooling, oligomer is mainly precipitated and recovered by filtering. Subsequently, the filtrate is pressurized, e.g., to above 20kg/cm2 by a final pump and reached to a cncentrating apparatus by a reverse osmosis membrane to separate to a concentrated solution and a permeate. A concentrated solution is concentrated to about 80W95% of a lactam concentration by a concentrating apparatus e.g. a double walled kettle and, moreover, supplied to a distillation and refining apparatus or the like to recover. On the other hand, the permeate is again reused in a refining process of polycaproamide chips.
COPYRIGHT: (C)1980,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP264679A JPS5594933A (en) | 1979-01-12 | 1979-01-12 | Purification of polycaproamide |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP264679A JPS5594933A (en) | 1979-01-12 | 1979-01-12 | Purification of polycaproamide |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS5594933A true JPS5594933A (en) | 1980-07-18 |
Family
ID=11535118
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP264679A Pending JPS5594933A (en) | 1979-01-12 | 1979-01-12 | Purification of polycaproamide |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5594933A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN102382296A (en) * | 2011-08-17 | 2012-03-21 | 浙江华建尼龙有限公司 | Production process for preparing fiber-grade nylon 6 chips with extracted aqueous concentrated solution and apparatus thereof |
-
1979
- 1979-01-12 JP JP264679A patent/JPS5594933A/en active Pending
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN102382296A (en) * | 2011-08-17 | 2012-03-21 | 浙江华建尼龙有限公司 | Production process for preparing fiber-grade nylon 6 chips with extracted aqueous concentrated solution and apparatus thereof |
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