JPS5498715A - Preparation of oxalic acid - Google Patents
Preparation of oxalic acidInfo
- Publication number
- JPS5498715A JPS5498715A JP109778A JP109778A JPS5498715A JP S5498715 A JPS5498715 A JP S5498715A JP 109778 A JP109778 A JP 109778A JP 109778 A JP109778 A JP 109778A JP S5498715 A JPS5498715 A JP S5498715A
- Authority
- JP
- Japan
- Prior art keywords
- tube
- phase
- aqueous phase
- oxalic acid
- vessel
- 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
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
Abstract
PURPOSE: To prepare oxalic acid, useful as chemicals, dyeing additives, reagent for analysis, etc., through successive processes comprising hydrolyzation of alkyl oxalate, phase-separation to an organic phase and an aqueous phase, recycling of the organic phase to the hydrolyzing process, and crystallization of oxalic acid from the aqueous phase.
CONSTITUTION: An alkyl oxalate (1 part by weight) and water (0.8W5 parts by weight) are introduced into the hydrolyzing vessel 1 through the tube 6 and the tube 7, respectively. The evaporated alcohol and water are condensed with the condenser 4. The water is taken out of the reaction vessel and circulated through the tube 10. The hydrolysis solution is introduced into the phase separation vessel 2 through the tube 11, and separated into an organic phase and an aqueous phase. The organic phase is circulated through the tube 12. The aqueous phase is introduced through the tubes 13 and 14 into the crystallization vessel 3, and crystals of oxalic acid are taken out from the tube 19. On the other hand, the residual solution is circulated through the tube 18. The following process comprising the separation of the alcohol dissolved in the aqueous phase in the distillation column 5 followed by the recycling of the residual solution into the crystallization vessel 3, may be added in option.
COPYRIGHT: (C)1979,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP109778A JPS5498715A (en) | 1978-01-11 | 1978-01-11 | Preparation of oxalic acid |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP109778A JPS5498715A (en) | 1978-01-11 | 1978-01-11 | Preparation of oxalic acid |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS5498715A true JPS5498715A (en) | 1979-08-03 |
Family
ID=11491975
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP109778A Pending JPS5498715A (en) | 1978-01-11 | 1978-01-11 | Preparation of oxalic acid |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5498715A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN1094922C (en) * | 2000-01-06 | 2002-11-27 | 天津大学 | Method for preparing oxalic acid by using diethyl oxalate |
CN113307736A (en) * | 2021-06-29 | 2021-08-27 | 河南心连心化学工业集团股份有限公司 | Device and method for producing oxalic acid by using byproduct oxalate produced in process of preparing ethylene glycol from coal |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS494203A (en) * | 1972-04-28 | 1974-01-16 | ||
JPS5219610A (en) * | 1975-08-04 | 1977-02-15 | Mitsubishi Chem Ind Ltd | Process for preparation of high purity butanediol |
-
1978
- 1978-01-11 JP JP109778A patent/JPS5498715A/en active Pending
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS494203A (en) * | 1972-04-28 | 1974-01-16 | ||
JPS5219610A (en) * | 1975-08-04 | 1977-02-15 | Mitsubishi Chem Ind Ltd | Process for preparation of high purity butanediol |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN1094922C (en) * | 2000-01-06 | 2002-11-27 | 天津大学 | Method for preparing oxalic acid by using diethyl oxalate |
CN113307736A (en) * | 2021-06-29 | 2021-08-27 | 河南心连心化学工业集团股份有限公司 | Device and method for producing oxalic acid by using byproduct oxalate produced in process of preparing ethylene glycol from coal |
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