JPS57130960A - Purification of dimethylformamide - Google Patents
Purification of dimethylformamideInfo
- Publication number
- JPS57130960A JPS57130960A JP1726481A JP1726481A JPS57130960A JP S57130960 A JPS57130960 A JP S57130960A JP 1726481 A JP1726481 A JP 1726481A JP 1726481 A JP1726481 A JP 1726481A JP S57130960 A JPS57130960 A JP S57130960A
- Authority
- JP
- Japan
- Prior art keywords
- formic acid
- dmf
- dimethylformamide
- raw
- reusable
- 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
Landscapes
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
Abstract
PURPOSE: To purify raw hydrous dimethylformamide into high-purity dimethyl-formamide reusable with reduced formic acid concentration, by adding an amino compound to the raw hydrous dimethylformamide containing formic acid as an impurity upto a neutralization point, followed by distillation.
CONSTITUTION: A raw hydrous dimethylformamide (referred to as DMF hereinafter) containing formic acid as an impurity is partially hydrolyzed to prepare dimethylamine and formic acid, to the raw hydrous DMF an amino compound such as a primary amine (e.g., isopropylamine) shown by the formulaIis added until a neutralization point is attained, formic acid is converted into a reaction product shown by the formula II which is removed out of the system, and the resulted MDF is distilled to give high-purity DMF. During the distillation, formic acid is changed into a salt having good thermal stability, an acid, a high-boiling component, is suppressed to reduce decomposition, and bumping will not occur. The concentration of formic acid is reduced to ≤1g/l, DMF reusable for preparing polyuretheane elastic fiber, etc. is prepared.
COPYRIGHT: (C)1982,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP56017264A JPS5857421B2 (en) | 1981-02-06 | 1981-02-06 | Purification method of dimethylformamide |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP56017264A JPS5857421B2 (en) | 1981-02-06 | 1981-02-06 | Purification method of dimethylformamide |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS57130960A true JPS57130960A (en) | 1982-08-13 |
JPS5857421B2 JPS5857421B2 (en) | 1983-12-20 |
Family
ID=11939103
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP56017264A Expired JPS5857421B2 (en) | 1981-02-06 | 1981-02-06 | Purification method of dimethylformamide |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5857421B2 (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN108299190A (en) * | 2018-03-07 | 2018-07-20 | 福州大学 | A kind of method of separation and azeotropic system |
CN111606822A (en) * | 2020-05-25 | 2020-09-01 | 安徽金禾实业股份有限公司 | Method for recovering acidic DMF (dimethyl formamide) in sucralose production |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH0532550U (en) * | 1991-09-26 | 1993-04-27 | 東洋化学株式会社 | Mounting structure for eaves trough mounting bracket |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS52128316A (en) * | 1976-04-21 | 1977-10-27 | Hitachi Shipbuilding Eng Co | Method of removing formic acid in process of recovering purificating dimethyl formamide |
-
1981
- 1981-02-06 JP JP56017264A patent/JPS5857421B2/en not_active Expired
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS52128316A (en) * | 1976-04-21 | 1977-10-27 | Hitachi Shipbuilding Eng Co | Method of removing formic acid in process of recovering purificating dimethyl formamide |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN108299190A (en) * | 2018-03-07 | 2018-07-20 | 福州大学 | A kind of method of separation and azeotropic system |
CN111606822A (en) * | 2020-05-25 | 2020-09-01 | 安徽金禾实业股份有限公司 | Method for recovering acidic DMF (dimethyl formamide) in sucralose production |
Also Published As
Publication number | Publication date |
---|---|
JPS5857421B2 (en) | 1983-12-20 |
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