JPS56100758A - Preparation of caprolactam - Google Patents

Preparation of caprolactam

Info

Publication number
JPS56100758A
JPS56100758A JP433080A JP433080A JPS56100758A JP S56100758 A JPS56100758 A JP S56100758A JP 433080 A JP433080 A JP 433080A JP 433080 A JP433080 A JP 433080A JP S56100758 A JPS56100758 A JP S56100758A
Authority
JP
Japan
Prior art keywords
caprolactam
boiling
distillation
high purity
beckmann
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
JP433080A
Other languages
Japanese (ja)
Other versions
JPS6021583B2 (en
Inventor
Mitsuaki Shiragami
Kazuo Tan
Takashi Hironaka
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.)
Mitsubishi Kasei Corp
Original Assignee
Mitsubishi Kasei Corp
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 Mitsubishi Kasei Corp filed Critical Mitsubishi Kasei Corp
Priority to JP55004330A priority Critical patent/JPS6021583B2/en
Publication of JPS56100758A publication Critical patent/JPS56100758A/en
Publication of JPS6021583B2 publication Critical patent/JPS6021583B2/en
Expired legal-status Critical Current

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Abstract

PURPOSE: To prepare the titled compound from cyclohexanone oxime in high purity and yield, by recycling the low-boiling and/or high-boiling fractions obtained by the distillation of crude caprolactam to the Beckmann rearrangement process or the heating process.
CONSTITUTION: Caprolactam is extracted with an organic solvent from a reaction mixture obtained either by the Beckmann of cyclohexanone oxime at 80W130°C in the presence of fuming sulfuric acid, or by the Beckmann rearrangement of the oxime at 70W100°C followed by heating at a temperature between 90°C and 125°C and higher than that of the rearrangement reaction. The organic solvent is removed from the extract, and the crude caprolactam thus obtained is purified by distillation to obtain high purity caprolactam. The yeild of the high purity caprolactam can be improved by recycling the low-boiling and/or the high-boiling fractions obtained by the distillation to the Beckmann rearrangement process or the heating process.
COPYRIGHT: (C)1981,JPO&Japio
JP55004330A 1980-01-18 1980-01-18 Caprolactam manufacturing method Expired JPS6021583B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP55004330A JPS6021583B2 (en) 1980-01-18 1980-01-18 Caprolactam manufacturing method

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP55004330A JPS6021583B2 (en) 1980-01-18 1980-01-18 Caprolactam manufacturing method

Publications (2)

Publication Number Publication Date
JPS56100758A true JPS56100758A (en) 1981-08-12
JPS6021583B2 JPS6021583B2 (en) 1985-05-28

Family

ID=11581427

Family Applications (1)

Application Number Title Priority Date Filing Date
JP55004330A Expired JPS6021583B2 (en) 1980-01-18 1980-01-18 Caprolactam manufacturing method

Country Status (1)

Country Link
JP (1) JPS6021583B2 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63156766A (en) * 1986-12-11 1988-06-29 バスフ　アクチェンゲゼルシャフト Production of caprolactam from beckman transformation of cyclohexanone oxime
US6706153B2 (en) * 1996-07-11 2004-03-16 Dsm N.V. Process for the separation of a ketoxime or aldoxime from an amide

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2667483A (en) * 1954-01-26 Purification of lactams
JPS5387384A (en) * 1977-01-12 1978-08-01 Stamicarbon Method of recovering epsilonncaprolactum

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2667483A (en) * 1954-01-26 Purification of lactams
JPS5387384A (en) * 1977-01-12 1978-08-01 Stamicarbon Method of recovering epsilonncaprolactum

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63156766A (en) * 1986-12-11 1988-06-29 バスフ　アクチェンゲゼルシャフト Production of caprolactam from beckman transformation of cyclohexanone oxime
US6706153B2 (en) * 1996-07-11 2004-03-16 Dsm N.V. Process for the separation of a ketoxime or aldoxime from an amide

Also Published As

Publication number Publication date
JPS6021583B2 (en) 1985-05-28

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