NL7115406A - Caprolactam purification by crystallisation from benzene toluene - and xylenes - Google Patents

Caprolactam purification by crystallisation from benzene toluene - and xylenes

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Publication number
NL7115406A
NL7115406A NL7115406A NL7115406A NL7115406A NL 7115406 A NL7115406 A NL 7115406A NL 7115406 A NL7115406 A NL 7115406A NL 7115406 A NL7115406 A NL 7115406A NL 7115406 A NL7115406 A NL 7115406A
Authority
NL
Netherlands
Prior art keywords
crystallisation
caprolactam
benzene
xylenes
purifying
Prior art date
Application number
NL7115406A
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 filed Critical
Priority to NL7115406A priority Critical patent/NL7115406A/en
Publication of NL7115406A publication Critical patent/NL7115406A/en

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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

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

Abstract

Crude lactam, prepared for example by cyclohexanone oxime re-arragnement in the presence of solid catalysts, such as B2O3, is dissolved in benzene or in a 7 - 8C alkylbenzene; precipitated by stirring and cooling to 0 - 50 degrees C; crystal suspension is filtered optionally after repeated re-crystallisation from benzene or 7 - 8C alkylbenzenes; and treated epsilon-caprolactam is distilled in vacuo. Pure epsilon-caprolactam is obtained, suitable for production of fibre-forming polyamides. Process can be adapted for purifying other lactams, or for purifying lactams obtained from polyamide waste. By-products as well as non-converted oxime are removed.
NL7115406A 1971-11-09 1971-11-09 Caprolactam purification by crystallisation from benzene toluene - and xylenes NL7115406A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
NL7115406A NL7115406A (en) 1971-11-09 1971-11-09 Caprolactam purification by crystallisation from benzene toluene - and xylenes

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL7115406A NL7115406A (en) 1971-11-09 1971-11-09 Caprolactam purification by crystallisation from benzene toluene - and xylenes

Publications (1)

Publication Number Publication Date
NL7115406A true NL7115406A (en) 1973-05-11

Family

ID=19814442

Family Applications (1)

Application Number Title Priority Date Filing Date
NL7115406A NL7115406A (en) 1971-11-09 1971-11-09 Caprolactam purification by crystallisation from benzene toluene - and xylenes

Country Status (1)

Country Link
NL (1) NL7115406A (en)

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