JPS5655341A - Preparation of high-purity o-toluic acid - Google Patents
Preparation of high-purity o-toluic acidInfo
- Publication number
- JPS5655341A JPS5655341A JP13083279A JP13083279A JPS5655341A JP S5655341 A JPS5655341 A JP S5655341A JP 13083279 A JP13083279 A JP 13083279A JP 13083279 A JP13083279 A JP 13083279A JP S5655341 A JPS5655341 A JP S5655341A
- Authority
- JP
- Japan
- Prior art keywords
- xylene
- products
- oily layer
- layer
- 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.)
- Granted
Links
Landscapes
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
Abstract
PURPOSE: To suppress the formation of by-products, and to obtain the titled acid useful as a raw material for fluorescent dye, etc. in high purity, by oxidizing o- xylene with a molecular oxygen-containing gas in liquid phase, treating the reaction product under specific conditions to give an oily layer, followed by the recycling the oily layer for the above-mentioned oxidation.
CONSTITUTION: o-Xylene, for example, is oxidized in gas phase with an air-, or oxygen-containing gas in the presence of a salt of heavy metal, e.g., Co, Mn, etc. as a catalyst at 120W180°C under 2W30kg/cm2G. In the case of a low conversion 20W40%, since amounts of o-phthalic acid and phthalide as by-products are relatively small, o- xylene is added to the product solution of oxidation, which is recrystallized and filtered to give the desired o-toluic acid as a cake. To the prepared filtrate is added water or a basic aqueous solution so that it is separated into an oily layer and an aqueous layer, and the by-products, e.g., o-phthalic acid, etc. are transferred into the aqueous layer side and removed, and the oily layer is recycled through the oxidative process.
USE: Sensitive dye, rust preventive, pigment, agricultural chemical, drug, etc.
COPYRIGHT: (C)1981,JPO&Japio
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP13083279A JPS5655341A (en) | 1979-10-12 | 1979-10-12 | Preparation of high-purity o-toluic acid |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP13083279A JPS5655341A (en) | 1979-10-12 | 1979-10-12 | Preparation of high-purity o-toluic acid |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5655341A true JPS5655341A (en) | 1981-05-15 |
| JPS622576B2 JPS622576B2 (en) | 1987-01-20 |
Family
ID=15043733
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP13083279A Granted JPS5655341A (en) | 1979-10-12 | 1979-10-12 | Preparation of high-purity o-toluic acid |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5655341A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5011987A (en) * | 1989-05-17 | 1991-04-30 | Mitsubishi Gas Chemical Company | Process for manufacturing high-purity o-toluic acid |
| EP0807618A3 (en) * | 1996-05-17 | 1999-04-21 | Toray Industries, Inc. | A method for preparing aromatic carboxylic acids, aromatic aldehydes and aromatic alcohols |
-
1979
- 1979-10-12 JP JP13083279A patent/JPS5655341A/en active Granted
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5011987A (en) * | 1989-05-17 | 1991-04-30 | Mitsubishi Gas Chemical Company | Process for manufacturing high-purity o-toluic acid |
| EP0807618A3 (en) * | 1996-05-17 | 1999-04-21 | Toray Industries, Inc. | A method for preparing aromatic carboxylic acids, aromatic aldehydes and aromatic alcohols |
| US6242643B1 (en) | 1996-05-17 | 2001-06-05 | Toray Industries, Inc. | Method for preparing aromatic carboxylic acids, aromatic aldehydes, and aromatic alcohols |
| US6437176B2 (en) | 1996-05-17 | 2002-08-20 | Toray Industries, Inc. | Method for preparing aromatic carboxylic acids, aromatic aldehydes, and aromatic alcohols |
| US6590129B2 (en) | 1996-05-17 | 2003-07-08 | Toray Industries, Inc. | Method for preparing aromatic carboxylic acids, aromatic aldehydes, and aromatic alcohols |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS622576B2 (en) | 1987-01-20 |
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