JPS5670019A - Recovery of washing solvent - Google Patents
Recovery of washing solventInfo
- Publication number
- JPS5670019A JPS5670019A JP14691279A JP14691279A JPS5670019A JP S5670019 A JPS5670019 A JP S5670019A JP 14691279 A JP14691279 A JP 14691279A JP 14691279 A JP14691279 A JP 14691279A JP S5670019 A JPS5670019 A JP S5670019A
- Authority
- JP
- Japan
- Prior art keywords
- prepolymer
- organic solvent
- solvent
- urethane prepolymer
- crude
- 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
- Vaporization, Distillation, Condensation, Sublimation, And Cold Traps (AREA)
- Polyurethanes Or Polyureas (AREA)
Abstract
PURPOSE: To recover highly pure organic solvent, economically, in an industrial scale, from a crude organic solvent containing urethane prepolymer, preventing the polymerization of the prepolymer, by distilling the crude solvent after treatment with a lower aliphatic alcohol, etc.
CONSTITUTION: A crude organic solvent (e.g. acetone) containing urethane prepolymer and obtained from the washing process of a reactor for preparation of urethane prepolymer, is mixed with a lower aliphatic alcohol (e.g. methanol) and a urethanization catalyst (e.g. dibutyltin dilaurate, dimethylbenzylamine, etc.), and heated at 30W150°C, pref. 50W80°C to effect the blocking of the isocyanate groups in the prepolymer. After the treatment, the mixture is distilled to recover the solvent.
COPYRIGHT: (C)1981,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP14691279A JPS5670019A (en) | 1979-11-13 | 1979-11-13 | Recovery of washing solvent |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP14691279A JPS5670019A (en) | 1979-11-13 | 1979-11-13 | Recovery of washing solvent |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS5670019A true JPS5670019A (en) | 1981-06-11 |
Family
ID=15418370
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP14691279A Pending JPS5670019A (en) | 1979-11-13 | 1979-11-13 | Recovery of washing solvent |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5670019A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4999213A (en) * | 1990-02-21 | 1991-03-12 | E. I. Du Pont De Nemours And Company | Monofunctional alcohols to prevent gelation in two component isocyanate coatings |
-
1979
- 1979-11-13 JP JP14691279A patent/JPS5670019A/en active Pending
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4999213A (en) * | 1990-02-21 | 1991-03-12 | E. I. Du Pont De Nemours And Company | Monofunctional alcohols to prevent gelation in two component isocyanate coatings |
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