GB1535485A - Isolation of epsilon-caprolactam - Google Patents

Isolation of epsilon-caprolactam

Info

Publication number
GB1535485A
GB1535485A GB2272777A GB2272777A GB1535485A GB 1535485 A GB1535485 A GB 1535485A GB 2272777 A GB2272777 A GB 2272777A GB 2272777 A GB2272777 A GB 2272777A GB 1535485 A GB1535485 A GB 1535485A
Authority
GB
United Kingdom
Prior art keywords
caprolactam
epsilon
isolation
toluene
lactam
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.)
Expired
Application number
GB2272777A
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.)
Bayer AG
Original Assignee
Bayer AG
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 Bayer AG filed Critical Bayer AG
Publication of GB1535485A publication Critical patent/GB1535485A/en
Expired legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07D—HETEROCYCLIC COMPOUNDS
    • C07D201/00—Preparation, separation, purification or stabilisation of unsubstituted lactams
    • C07D201/16—Separation or purification

Abstract

Process for purifying epsilon -caprolactam by extraction and recrystallisation, wherein a crude lactam is extracted with toluene and recrystallised from toluene. The process is particularly simple to carry out continuously with high yield without distillation to obtain ultrapure lactam.
GB2272777A 1976-06-05 1977-05-30 Isolation of epsilon-caprolactam Expired GB1535485A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19762625402 DE2625402A1 (en) 1976-06-05 1976-06-05 CLEANING EPSILON CAPROLACTAM

Publications (1)

Publication Number Publication Date
GB1535485A true GB1535485A (en) 1978-12-13

Family

ID=5979933

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2272777A Expired GB1535485A (en) 1976-06-05 1977-05-30 Isolation of epsilon-caprolactam

Country Status (10)

Country Link
JP (1) JPS52151186A (en)
BE (1) BE855367A (en)
BR (1) BR7703572A (en)
CH (1) CH626339A5 (en)
DD (1) DD132491A5 (en)
DE (1) DE2625402A1 (en)
ES (1) ES459328A1 (en)
FR (1) FR2353535A1 (en)
GB (1) GB1535485A (en)
NL (1) NL7706080A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115253380A (en) * 2022-08-19 2022-11-01 清元智能科技研究院(湖北)有限公司 Caprolactam extraction system and method

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2845075A1 (en) * 1978-10-17 1980-05-08 Basf Ag METHOD FOR PURIFYING ROHCAPROLACTAM

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH522649A (en) * 1970-04-17 1973-04-13 Buchs Metallwerk Ag Caprolactam purification - by solvent extn and crystallisation using same solvent
SU387996A1 (en) * 1971-04-30 1973-06-22 METHOD OF CLEANING CAPROLACTAM
CH564528A5 (en) * 1972-06-14 1975-07-31 Buchs Metallwerk Ag Purification of caprolactam freed from water - by counter-current multi-stage cystallisation from the melt using a solvent

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115253380A (en) * 2022-08-19 2022-11-01 清元智能科技研究院(湖北)有限公司 Caprolactam extraction system and method
CN115253380B (en) * 2022-08-19 2023-09-01 清元智能科技研究院(湖北)有限公司 Caprolactam extraction system and method

Also Published As

Publication number Publication date
JPS52151186A (en) 1977-12-15
DD132491A5 (en) 1978-10-04
ES459328A1 (en) 1978-03-16
FR2353535A1 (en) 1977-12-30
BE855367A (en) 1977-12-05
DE2625402A1 (en) 1977-12-22
FR2353535B1 (en) 1982-07-02
BR7703572A (en) 1978-03-21
CH626339A5 (en) 1981-11-13
NL7706080A (en) 1977-12-07

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Legal Events

Date Code Title Description
PS Patent sealed
PCNP Patent ceased through non-payment of renewal fee