BE775173A - Caprolactam purification by crystallisation from benzene toluene - and xylenes - Google Patents

Caprolactam purification by crystallisation from benzene toluene - and xylenes

Info

Publication number
BE775173A
BE775173A BE775173A BE775173A BE775173A BE 775173 A BE775173 A BE 775173A BE 775173 A BE775173 A BE 775173A BE 775173 A BE775173 A BE 775173A BE 775173 A BE775173 A BE 775173A
Authority
BE
Belgium
Prior art keywords
crystallisation
caprolactam
benzene
xylenes
purifying
Prior art date
Application number
BE775173A
Other languages
French (fr)
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
Priority to BE775173A priority Critical patent/BE775173A/en
Publication of BE775173A publication Critical patent/BE775173A/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

Landscapes

  • 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.
BE775173A 1971-11-10 1971-11-10 Caprolactam purification by crystallisation from benzene toluene - and xylenes BE775173A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
BE775173A BE775173A (en) 1971-11-10 1971-11-10 Caprolactam purification by crystallisation from benzene toluene - and xylenes

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
BE775173A BE775173A (en) 1971-11-10 1971-11-10 Caprolactam purification by crystallisation from benzene toluene - and xylenes

Publications (1)

Publication Number Publication Date
BE775173A true BE775173A (en) 1972-03-01

Family

ID=3858860

Family Applications (1)

Application Number Title Priority Date Filing Date
BE775173A BE775173A (en) 1971-11-10 1971-11-10 Caprolactam purification by crystallisation from benzene toluene - and xylenes

Country Status (1)

Country Link
BE (1) BE775173A (en)

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