GB708034A - Improvements relating to the separation of caprolactam from solution - Google Patents

Improvements relating to the separation of caprolactam from solution

Info

Publication number
GB708034A
GB708034A GB958/52A GB95852A GB708034A GB 708034 A GB708034 A GB 708034A GB 958/52 A GB958/52 A GB 958/52A GB 95852 A GB95852 A GB 95852A GB 708034 A GB708034 A GB 708034A
Authority
GB
United Kingdom
Prior art keywords
oil
caprolactam
solution
hydroxide
sodium
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
GB958/52A
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.)
Directie van de Staatsmijnen in Limburg
Original Assignee
Directie van de Staatsmijnen in Limburg
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 Directie van de Staatsmijnen in Limburg filed Critical Directie van de Staatsmijnen in Limburg
Publication of GB708034A publication Critical patent/GB708034A/en
Expired legal-status Critical Current

Links

Classifications

    • CCHEMISTRY; METALLURGY
    • C07ORGANIC CHEMISTRY
    • C07DHETEROCYCLIC COMPOUNDS
    • C07D201/00Preparation, separation, purification or stabilisation of unsubstituted lactams
    • C07D201/16Separation or purification
    • CCHEMISTRY; METALLURGY
    • C07ORGANIC CHEMISTRY
    • C07DHETEROCYCLIC COMPOUNDS
    • C07D223/00Heterocyclic compounds containing seven-membered rings having one nitrogen atom as the only ring hetero atom
    • C07D223/02Heterocyclic compounds containing seven-membered rings having one nitrogen atom as the only ring hetero atom not condensed with other rings
    • C07D223/06Heterocyclic 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
    • C07D223/08Oxygen atoms
    • C07D223/10Oxygen atoms attached in position 2

Landscapes

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

Abstract

Caprolactam is separated from a solution in sulphuric acid or oleum by (a) neutralizing the solution with aqueous ammonia or ammonium salts having an alkaline reaction; (b) separating the caprolactam oil mechanically from the aqueous layer containing dissolved ammonium salts, and (c) mixing the oil with an alkali metal compound or with an alkaline earth metal compound having an alkaline reaction in sufficient quantity to convert the ammonium sulphate dissolved in the oil to an alkali metal or alkaline earth metal salt, separating the solid substances formed and distilling the oil at reduced pressure. Suitable alkali metal or alkaline earth metal compounds are sodium hydroxide, sodium carbonate, sodium borate, barium hydroxide, calcium hydroxide, potassium hydroxide, potassium carbonate, potassium silicate, sodium formate or potassium acetate. In the example a solution of caprolactam in sulphuric acid prepared from cyclohexanonoxime by the Beckmann process is neutralised with aqueous ammonia; the resulting oil is mixed with sodium hydroxide, filtered and distilled under reduced pressure.
GB958/52A 1951-01-18 1952-01-11 Improvements relating to the separation of caprolactam from solution Expired GB708034A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL708034X 1951-01-18

Publications (1)

Publication Number Publication Date
GB708034A true GB708034A (en) 1954-04-28

Family

ID=19812121

Family Applications (1)

Application Number Title Priority Date Filing Date
GB958/52A Expired GB708034A (en) 1951-01-18 1952-01-11 Improvements relating to the separation of caprolactam from solution

Country Status (1)

Country Link
GB (1) GB708034A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2993889A (en) * 1961-07-25 Separation of a lactam from an acid
US3021326A (en) * 1962-02-13 snider

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2993889A (en) * 1961-07-25 Separation of a lactam from an acid
US3021326A (en) * 1962-02-13 snider

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