GB1003858A - Improved process for the purification of caprolactam - Google Patents

Improved process for the purification of caprolactam

Info

Publication number
GB1003858A
GB1003858A GB31371/62A GB3137162A GB1003858A GB 1003858 A GB1003858 A GB 1003858A GB 31371/62 A GB31371/62 A GB 31371/62A GB 3137162 A GB3137162 A GB 3137162A GB 1003858 A GB1003858 A GB 1003858A
Authority
GB
United Kingdom
Prior art keywords
product
water
caprolactam
evaporation
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.)
Expired
Application number
GB31371/62A
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.)
SNIA Viscosa SpA
Original Assignee
SNIA Viscosa SpA
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 SNIA Viscosa SpA filed Critical SNIA Viscosa SpA
Publication of GB1003858A publication Critical patent/GB1003858A/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
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07D—HETEROCYCLIC COMPOUNDS
    • C07D201/00—Preparation, separation, purification or stabilisation of unsubstituted lactams
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07D—HETEROCYCLIC COMPOUNDS
    • C07D201/00—Preparation, separation, purification or stabilisation of unsubstituted lactams
    • C07D201/02—Preparation of lactams
    • C07D201/08—Preparation of lactams from carboxylic acids or derivatives thereof, e.g. hydroxy carboxylic acids, lactones or nitriles
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07D—HETEROCYCLIC COMPOUNDS
    • C07D223/00—Heterocyclic compounds containing seven-membered rings having one nitrogen atom as the only ring hetero atom
    • C07D223/02—Heterocyclic compounds containing seven-membered rings having one nitrogen atom as the only ring hetero atom not condensed with other rings
    • C07D223/06—Heterocyclic compounds containing seven-membered rings having one nitrogen atom as the only ring hetero atom not condensed with other rings with hetero atoms or with carbon atoms having three bonds to hetero atoms with at the most one bond to halogen, e.g. ester or nitrile radicals, directly attached to ring carbon atoms
    • C07D223/08—Oxygen atoms
    • C07D223/10—Oxygen atoms attached in position 2

Landscapes

  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)

Abstract

A process for the purification of crude caprolactam, obtained by the nitrosation of cyclohexyl compounds containing a tertiary carbon atom such as hexahydrobenzoic acid or its functional derivatives, comprises dissolving the caprolactam in water, followed by at least one alkaline treatment of the crude caprolactam solution, distillation of the product obtained after evaporation of the water, a reduction of the distilled product, and a final oxidation of an aqueous solution of the reduced product. In one embodiment, the process further comprises an alkaline treatment of the oxidised solution and a subsequent distillation of the product obtained after evaporation of the water. In a second embodiment, the process comprises a basic treatment of the crude caprolactam solution followed by distillation of the product obtained after evaporation of the water, a reduction of the distilled product, a basic treatment of the reduced product and, finally, oxidation of the latter. Intermediate filtration steps may additionally be performed. Examples are given. Specifications 904,302, 904,413 and 912,034 are referred to.
GB31371/62A 1961-08-30 1962-08-15 Improved process for the purification of caprolactam Expired GB1003858A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
IT1577061 1961-08-30

Publications (1)

Publication Number Publication Date
GB1003858A true GB1003858A (en) 1965-09-08

Family

ID=11148210

Family Applications (1)

Application Number Title Priority Date Filing Date
GB31371/62A Expired GB1003858A (en) 1961-08-30 1962-08-15 Improved process for the purification of caprolactam

Country Status (3)

Country Link
CH (1) CH421968A (en)
ES (1) ES280225A1 (en)
GB (1) GB1003858A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109694349A (en) * 2017-10-24 2019-04-30 中国石油化工股份有限公司 A kind of method of caprolactam refining

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109694349A (en) * 2017-10-24 2019-04-30 中国石油化工股份有限公司 A kind of method of caprolactam refining
CN109694349B (en) * 2017-10-24 2022-10-14 中国石油化工股份有限公司 Caprolactam refining method

Also Published As

Publication number Publication date
ES280225A1 (en) 1962-11-01
CH421968A (en) 1966-10-15

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