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JPS57130964A - Purification of acetone cyanohydrin - Google Patents

Purification of acetone cyanohydrin

Info

Publication number
JPS57130964A
JPS57130964A JP1496081A JP1496081A JPS57130964A JP S57130964 A JPS57130964 A JP S57130964A JP 1496081 A JP1496081 A JP 1496081A JP 1496081 A JP1496081 A JP 1496081A JP S57130964 A JPS57130964 A JP S57130964A
Authority
JP
Japan
Prior art keywords
acetone
water
acetone cyanohydrin
crude
distillation
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
JP1496081A
Other languages
Japanese (ja)
Other versions
JPH0132818B2 (en
Inventor
Hiroaki Kai
Satoru Nezu
Hirohito Goto
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.)
Asahi Kasei Corp
Asahi Chemical Industry Co Ltd
Original Assignee
Asahi Chemical Industry Co Ltd
Asahi Kasei 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 Asahi Chemical Industry Co Ltd, Asahi Kasei Kogyo KK filed Critical Asahi Chemical Industry Co Ltd
Priority to JP1496081A priority Critical patent/JPS57130964A/en
Publication of JPS57130964A publication Critical patent/JPS57130964A/en
Publication of JPH0132818B2 publication Critical patent/JPH0132818B2/ja
Granted legal-status Critical Current

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  • Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)

Abstract

PURPOSE: To purify crude acetone cyanohydrin liquid containing acidic impuritues, unreacted hydrocyanic acid, unreacted acetone and water, continuously, in high purity, by carrying out fractional distillation of the liquid keeping the water-content and pH within specific ranges.
CONSTITUTION: Purified acetone cyanohydrin is obtained from crude acetone cyanohydrin containing acidic impurities, hydrocyanic acid, acetone and water, by adjusting the water-content of the crude liquid to ≤2.5wt%, pref. ≤1.0wt%, and carrying out the fractional distillation of the liquid keeping the pH of the 10vol% aqueous solution of purified acetone cyanohydrin extracted from the bottom of the distillation column within 3.2W4.5 by adding a proper amount of an acid or alkali to the distillation system. The distillation temp. is pref. ≤ 130°C, esp. 100W125°C. The decomposition of the objective compound is suppressed, and the compound can be purified economically. The crude raw material is obtained by reacting hydrocyanic acid with acetone in the presence of an alkaline catalyst, and neutralizing the catalyst.
COPYRIGHT: (C)1982,JPO&Japio
JP1496081A 1981-02-05 1981-02-05 Purification of acetone cyanohydrin Granted JPS57130964A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP1496081A JPS57130964A (en) 1981-02-05 1981-02-05 Purification of acetone cyanohydrin

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP1496081A JPS57130964A (en) 1981-02-05 1981-02-05 Purification of acetone cyanohydrin

Publications (2)

Publication Number Publication Date
JPS57130964A true JPS57130964A (en) 1982-08-13
JPH0132818B2 JPH0132818B2 (en) 1989-07-10

Family

ID=11875539

Family Applications (1)

Application Number Title Priority Date Filing Date
JP1496081A Granted JPS57130964A (en) 1981-02-05 1981-02-05 Purification of acetone cyanohydrin

Country Status (1)

Country Link
JP (1) JPS57130964A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1040642C (en) * 1993-10-14 1998-11-11 中国石油化工总公司 Vaccum rectification for purifying acetone cyanohydrin
JP2007031456A (en) * 2006-11-13 2007-02-08 Asahi Kasei Chemicals Corp Method for producing acetone cyanhydrin
US20100056742A1 (en) * 2006-12-08 2010-03-04 Evonik Roehm Gmbh Process and apparatus for preparing alkyl esters of methacrylic acid

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5718655A (en) * 1980-07-08 1982-01-30 Mitsui Toatsu Chem Inc Preparation of acetone cyanhydrin

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5718655A (en) * 1980-07-08 1982-01-30 Mitsui Toatsu Chem Inc Preparation of acetone cyanhydrin

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1040642C (en) * 1993-10-14 1998-11-11 中国石油化工总公司 Vaccum rectification for purifying acetone cyanohydrin
JP2007031456A (en) * 2006-11-13 2007-02-08 Asahi Kasei Chemicals Corp Method for producing acetone cyanhydrin
US20100056742A1 (en) * 2006-12-08 2010-03-04 Evonik Roehm Gmbh Process and apparatus for preparing alkyl esters of methacrylic acid
US9637574B2 (en) * 2006-12-08 2017-05-02 Evonik Röhm Gmbh Process and apparatus for preparing alkyl esters of methacrylic acid

Also Published As

Publication number Publication date
JPH0132818B2 (en) 1989-07-10

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