GB750222A - Improvements in the production of amides - Google Patents

Improvements in the production of amides

Info

Publication number
GB750222A
GB750222A GB2406852A GB2406852A GB750222A GB 750222 A GB750222 A GB 750222A GB 2406852 A GB2406852 A GB 2406852A GB 2406852 A GB2406852 A GB 2406852A GB 750222 A GB750222 A GB 750222A
Authority
GB
United Kingdom
Prior art keywords
chloroform
beckmann
acetic acid
water
extracted
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
GB2406852A
Inventor
Irene Marianne Cohn
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.)
Acordis UK Ltd
Original Assignee
British Celanese Ltd
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 British Celanese Ltd filed Critical British Celanese Ltd
Priority to GB2406852A priority Critical patent/GB750222A/en
Publication of GB750222A publication Critical patent/GB750222A/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

Landscapes

  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Other In-Based Heterocyclic Compounds (AREA)

Abstract

Reaction mixtures containing lactams and un-neutralized mineral acid obtained in the Beckmann transformation of oximes of cyclic ketones, are extracted by means of chloroform to recover the lactam. The Beckmann mixture is preferably diluted with water before extraction so that it contains 100 to 200 grams of sulphuric acid per litre of combined sulphuric acid and water. The extraction may be carried out in the presence of acetic acid or chlorinated acetic acid which may be present in the Beckmann transformation or added to the chloroform. In examples, a Beckmann reaction product containing caprolactam and sulphuric acid is diluted with water and extracted in a column with (1) chloroform, or (2) a mixture of chloroform and acetic acid, (3) and (4) a Beckmann reaction mixture containing acetic acid is diluted with water and extracted with chloroform. The preparation of a lactam from suberone iso-oxime also is referred to. According to the Provisional Specification chloroform may be replaced by other chlorinated aliphatic hydrocarbons, e.g. methylene chloride, trichlorethane, tetrachlorethane, trichlorethylene and perchlorethylene. Specifications 740,891 and 750,221 are referred to.
GB2406852A 1952-09-25 1952-09-25 Improvements in the production of amides Expired GB750222A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB2406852A GB750222A (en) 1952-09-25 1952-09-25 Improvements in the production of amides

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB2406852A GB750222A (en) 1952-09-25 1952-09-25 Improvements in the production of amides

Publications (1)

Publication Number Publication Date
GB750222A true GB750222A (en) 1956-06-13

Family

ID=10205852

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2406852A Expired GB750222A (en) 1952-09-25 1952-09-25 Improvements in the production of amides

Country Status (1)

Country Link
GB (1) GB750222A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4021422A (en) * 1974-08-05 1977-05-03 Stamicarbon B.V. Process for the recovery of ε-caprolactam from reaction mixture of ε-caprolactam and sulphuric acid
EP0002300A1 (en) * 1977-12-02 1979-06-13 Stamicarbon B.V. Process for the recovery of 2-pyrrolidone

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4021422A (en) * 1974-08-05 1977-05-03 Stamicarbon B.V. Process for the recovery of ε-caprolactam from reaction mixture of ε-caprolactam and sulphuric acid
EP0002300A1 (en) * 1977-12-02 1979-06-13 Stamicarbon B.V. Process for the recovery of 2-pyrrolidone

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