JPS5655341A - Preparation of high-purity o-toluic acid - Google Patents

Preparation of high-purity o-toluic acid

Info

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
Application number
JP13083279A
Other languages
Japanese (ja)
Other versions
JPS622576B2 (en
Inventor
Yoshiaki Noda
Shunji Takemasa
Harutoshi Oota
Shigeo Sugita
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
NIPPON JIYOURIYUU KOGYO KK
Original Assignee
NIPPON JIYOURIYUU KOGYO KK
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by NIPPON JIYOURIYUU KOGYO KK filed Critical NIPPON JIYOURIYUU KOGYO KK
Priority to JP13083279A priority Critical patent/JPS5655341A/en
Publication of JPS5655341A publication Critical patent/JPS5655341A/en
Publication of JPS622576B2 publication Critical patent/JPS622576B2/ja
Granted legal-status Critical Current

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  • 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
JP13083279A 1979-10-12 1979-10-12 Preparation of high-purity o-toluic acid Granted JPS5655341A (en)

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)

* Cited by examiner, † Cited by third party
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

Cited By (5)

* Cited by examiner, † Cited by third party
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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