CN1415594A - Method for preparing crotonic acid - Google Patents
Method for preparing crotonic acid Download PDFInfo
- Publication number
- CN1415594A CN1415594A CN 02138692 CN02138692A CN1415594A CN 1415594 A CN1415594 A CN 1415594A CN 02138692 CN02138692 CN 02138692 CN 02138692 A CN02138692 A CN 02138692A CN 1415594 A CN1415594 A CN 1415594A
- Authority
- CN
- China
- Prior art keywords
- tower
- dousuan
- silver powder
- crotonic aldehyde
- crotonic acid
- 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.)
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- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
Abstract
A process for preparing crotonic acid features that under the catalysis of silver powder as catalyst, the crotonaldehyde is oxidized in oxidizing tower to obtain crotonic acid. Its advantages are high output rate and short reaction time.
Description
Technical field
The present invention relates to make the preparation method of Ba Dousuan with the crotons formoxy-ization.
Background technology
Crotonic aldehyde oxidation at present prepares Ba Dousuan makes crotonic aldehyde be oxidized to Ba Dousuan by the catalyst acetic acid salt in oxidizing tower usually, but catalyzer can not recycle, and the reaction times is longer, and the product yield is relatively low.
Summary of the invention
For improving the Ba Dousuan yield, shorten the reaction times, further reduce cost, the invention provides a kind of is the method for Preparation of Catalyst Ba Dousuan with the silver powder.
The present invention is a raw material with the crotonic aldehyde, is catalyzer with the silver powder, makes crotonic aldehyde in oxidizing tower, in tower in silver powder: crotonic aldehyde=1-3: under the silver powder catalysis of 1000 ratios, atmospheric oxygen changes into Ba Dousuan.
During oxidation of the present invention, liquid temp is 15-130 ℃ in the tower, and the tower internal pressure is 0.1-0.5mpa.
The present invention is a catalyzer with the silver powder, is the feedstock production Ba Dousuan with the crotonic aldehyde, and oxidization time is shortened, and the Ba Dousuan yield is brought up to about 75% by about 60% simultaneously, and catalyzer can recycling use, has reduced cost effectively.
Embodiment
With the silver powder catalyzer by weight silver powder: crotonic aldehyde=1-3: 1000 silver powder adds in the oxidizing tower, crotonic aldehyde is heated up, when rising to 30-40 ℃, in oxidizing tower, feed about 6 hours air continuously, the oxidizing tower temperature is controlled at 15-130 ℃, and the catalyzer kick off temperature is 20 ℃; Tower inner control pressure is 0.1-5mpa, and reflux temperature is controlled at below 50 ℃, and the oxidation reflux temperature is regulated with cooling water flow, closes valve steam after reaction is normal, and logical then water coolant is kept temperature in the tower.When material acid number 35-37%, finish oxidation work.The purification of Ba Dousuan is that the Ba Dousuan crude product is sent in the crude steam kettle, slightly evaporates, and boils off crotonic aldehyde, sends into then in the distillation tower, under the 0.9mpa vacuum condition, distills out 99% Ba Dousuan salable product.
Claims (2)
1, the preparation method of Ba Dousuan is a raw material with the crotonic aldehyde, is catalyzer with the silver powder, makes crotonic aldehyde in oxidizing tower, in tower in silver powder: crotonic aldehyde=1-3: under the silver powder catalysis of 1000 ratios, atmospheric oxygen changes into Ba Dousuan.
2, preparation method according to claim 1, the interior liquidus temperature of tower is 15-130 ℃ when it is characterized in that oxidation, the tower internal pressure is 0.1-0.5Mpa.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02138692 CN1415594A (en) | 2002-11-29 | 2002-11-29 | Method for preparing crotonic acid |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02138692 CN1415594A (en) | 2002-11-29 | 2002-11-29 | Method for preparing crotonic acid |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1415594A true CN1415594A (en) | 2003-05-07 |
Family
ID=4749635
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 02138692 Pending CN1415594A (en) | 2002-11-29 | 2002-11-29 | Method for preparing crotonic acid |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1415594A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101391948B (en) * | 2007-09-20 | 2012-06-13 | 浙江新和成股份有限公司 | Method for preparing 3-methyl-2-butenoic acid |
| CN108250069A (en) * | 2018-01-22 | 2018-07-06 | 万华化学集团股份有限公司 | A kind of preparation method of isooctyl acid |
| CN114315557A (en) * | 2022-02-11 | 2022-04-12 | 北京弗莱明科技有限公司 | Production method of trans-butene-2-acid with high yield |
| CN116283556A (en) * | 2023-05-18 | 2023-06-23 | 北京弗莱明科技有限公司 | Rectification separation process of crude 2-butenoic acid product |
-
2002
- 2002-11-29 CN CN 02138692 patent/CN1415594A/en active Pending
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101391948B (en) * | 2007-09-20 | 2012-06-13 | 浙江新和成股份有限公司 | Method for preparing 3-methyl-2-butenoic acid |
| CN108250069A (en) * | 2018-01-22 | 2018-07-06 | 万华化学集团股份有限公司 | A kind of preparation method of isooctyl acid |
| CN108250069B (en) * | 2018-01-22 | 2021-01-15 | 万华化学集团股份有限公司 | Preparation method of isooctanoic acid |
| CN114315557A (en) * | 2022-02-11 | 2022-04-12 | 北京弗莱明科技有限公司 | Production method of trans-butene-2-acid with high yield |
| CN114315557B (en) * | 2022-02-11 | 2022-06-10 | 北京弗莱明科技有限公司 | Production method of trans-2-butenoic acid with high yield |
| CN116283556A (en) * | 2023-05-18 | 2023-06-23 | 北京弗莱明科技有限公司 | Rectification separation process of crude 2-butenoic acid product |
| CN116283556B (en) * | 2023-05-18 | 2023-08-15 | 北京弗莱明科技有限公司 | Rectification separation process of crude 2-butenoic acid product |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |