GB867741A - Method of removing impurity from aqueous solutions of caprolactam containing lactam oligomers - Google Patents

Method of removing impurity from aqueous solutions of caprolactam containing lactam oligomers

Info

Publication number
GB867741A
GB867741A GB5134/60A GB513460A GB867741A GB 867741 A GB867741 A GB 867741A GB 5134/60 A GB5134/60 A GB 5134/60A GB 513460 A GB513460 A GB 513460A GB 867741 A GB867741 A GB 867741A
Authority
GB
United Kingdom
Prior art keywords
oligomers
temperature
passing
containing lactam
aqueous solutions
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
GB5134/60A
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.)
Stamicarbon BV
Original Assignee
Stamicarbon BV
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 Stamicarbon BV filed Critical Stamicarbon BV
Publication of GB867741A publication Critical patent/GB867741A/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
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
    • C08G69/00—Macromolecular compounds obtained by reactions forming a carboxylic amide link in the main chain of the macromolecule
    • C08G69/02—Polyamides derived from amino-carboxylic acids or from polyamines and polycarboxylic acids
    • C08G69/08—Polyamides derived from amino-carboxylic acids or from polyamines and polycarboxylic acids derived from amino-carboxylic acids
    • C08G69/14—Lactams
    • C08G69/16—Preparatory processes

Abstract

Polycaprolactam is prepared by heating at 200 DEG -300 DEG C. the evaporation residue from an aqueous caprolactam solution which has been purified by passing the impure aqueous solution containing lactam oligomers which form a solid phase at room temperature, through one or more cation and/or anion exchangers at a temperature of at least 30 DEG C. Specifications 762,879, 763,953, 793,598 and 838,591 are referred to.ALSO:Impurities or impurities and oligomers are removed from an impure aqueous caprolactam solution containing lactam oligomers which at room temperature form a solid phase, by passing the aqueous solution at a temperature of at least 30 DEG C. through one or more cation and/or anion exchangers. Linear oligomers may be removed from an ion exchanger by passing H2SO4 or HNO3 of concentrations greater than 2N over the exchanger. The starting solution may be lactam wash water, and the temperature should be such that all or almost all of the oligomers are dissolved. Specifications 762,879, 763,953, 793,598 and 838,591 are referred to.
GB5134/60A 1959-02-14 1960-02-12 Method of removing impurity from aqueous solutions of caprolactam containing lactam oligomers Expired GB867741A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL867741X 1959-02-14

Publications (1)

Publication Number Publication Date
GB867741A true GB867741A (en) 1961-05-10

Family

ID=19849314

Family Applications (1)

Application Number Title Priority Date Filing Date
GB5134/60A Expired GB867741A (en) 1959-02-14 1960-02-12 Method of removing impurity from aqueous solutions of caprolactam containing lactam oligomers

Country Status (1)

Country Link
GB (1) GB867741A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111527051A (en) * 2018-06-01 2020-08-11 伍德依文达菲瑟有限责任公司 Method for recovering extraction water in the production of polyamide 6

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111527051A (en) * 2018-06-01 2020-08-11 伍德依文达菲瑟有限责任公司 Method for recovering extraction water in the production of polyamide 6

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