JPS5781430A - Purification of formaldehyde - Google Patents
Purification of formaldehydeInfo
- Publication number
- JPS5781430A JPS5781430A JP15768980A JP15768980A JPS5781430A JP S5781430 A JPS5781430 A JP S5781430A JP 15768980 A JP15768980 A JP 15768980A JP 15768980 A JP15768980 A JP 15768980A JP S5781430 A JPS5781430 A JP S5781430A
- Authority
- JP
- Japan
- Prior art keywords
- hemiformal
- temperature
- formaldehyde
- column
- water content
- 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 obtain purified formaldehyde having low water content, by using a varpor-liquid contact column as a thermal decomposition device for hemiformal to give decomposed hemiformal with a low water content, by controlling the temperature of wet wall column at normal temperature.
CONSTITUTION: An aqueous solution of formaldehyde is fed from the pipe 11 to the production tank 1 for hemiformal and decomposed hemiformal is introduced from the pipe 12 to the tank 1 to give hemiformal, and water in the hemiformal is evaporated by the evaporator 2 into a water content of 0.5W1.0wt%. The hemiformal is then sent to the upper part of the vapor-liquid contact column 3, the temperature of the bottom part of the column is kept at ≥the decomposition temperature of hemiformal, the temperature of the upper and middle parts of the column are maintained at < the decomposition temperature of hemiformal, and hemiformal is decomposed thermally at the bottom part of columm. Water is sent with formaldehyde by the contact formed and rising formaldehyde and hemiformal flowing down. By the use of decomposed hemiformal with low water content in spite of the operation of the wet wall column 4 at normal temperature, the desired substance with a water content of ≤100ppm is obtained from the pipe 19 in high yield.
COPYRIGHT: (C)1982,JPO&Japio
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15768980A JPS5834450B2 (en) | 1980-11-11 | 1980-11-11 | Formaldehyde purification method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15768980A JPS5834450B2 (en) | 1980-11-11 | 1980-11-11 | Formaldehyde purification method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5781430A true JPS5781430A (en) | 1982-05-21 |
| JPS5834450B2 JPS5834450B2 (en) | 1983-07-27 |
Family
ID=15655227
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP15768980A Expired JPS5834450B2 (en) | 1980-11-11 | 1980-11-11 | Formaldehyde purification method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5834450B2 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2013111462A1 (en) * | 2012-01-24 | 2013-08-01 | ポリプラスチックス株式会社 | Method for producing hemiformal concentrate, and method for producing formaldehyde gas |
| WO2013118552A1 (en) * | 2012-02-09 | 2013-08-15 | ポリプラスチックス株式会社 | Method for producing formaldehyde gas and apparatus for producing formaldehyde gas |
-
1980
- 1980-11-11 JP JP15768980A patent/JPS5834450B2/en not_active Expired
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2013111462A1 (en) * | 2012-01-24 | 2013-08-01 | ポリプラスチックス株式会社 | Method for producing hemiformal concentrate, and method for producing formaldehyde gas |
| JP2013151439A (en) * | 2012-01-24 | 2013-08-08 | Polyplastics Co | Method for producing hemiformal concentrate and method for producing formaldehyde gas |
| WO2013118552A1 (en) * | 2012-02-09 | 2013-08-15 | ポリプラスチックス株式会社 | Method for producing formaldehyde gas and apparatus for producing formaldehyde gas |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5834450B2 (en) | 1983-07-27 |
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