GB347666A - Improvements in and relating to the production of halogen phthalic anhydrides - Google Patents

Improvements in and relating to the production of halogen phthalic anhydrides

Info

Publication number
GB347666A
GB347666A GB3947029A GB3947029A GB347666A GB 347666 A GB347666 A GB 347666A GB 3947029 A GB3947029 A GB 3947029A GB 3947029 A GB3947029 A GB 3947029A GB 347666 A GB347666 A GB 347666A
Authority
GB
United Kingdom
Prior art keywords
acid
heated
sulphuric
parts
salt
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
GB3947029A
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.)
PHILIP FLETCHER BANGHAM
Scottish Dyes Ltd
Original Assignee
PHILIP FLETCHER BANGHAM
Scottish Dyes 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 PHILIP FLETCHER BANGHAM, Scottish Dyes Ltd filed Critical PHILIP FLETCHER BANGHAM
Priority to GB3947029A priority Critical patent/GB347666A/en
Publication of GB347666A publication Critical patent/GB347666A/en
Expired legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
    • C07C51/00—Preparation of carboxylic acids or their salts, halides or anhydrides
    • C07C51/54—Preparation of carboxylic acid anhydrides
    • C07C51/56—Preparation of carboxylic acid anhydrides from organic acids, their salts, their esters or their halides, e.g. by carboxylation

Landscapes

  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Engineering & Computer Science (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)

Abstract

A salt of a halogen phthalic acid is treated with sulphuric or hydrochloric acid, preferably in theoretical amount, and heated to obtain a sulphate or chloride and the corresponding halogen phthalic anhydride. In order to avoid unnecessary evaporation, it is preferred to use the concentrated acid, so that the strength of the sulphuric acid, for example, should be over 90 per cent. The product obtained in suitable for use in condensation, especially in condensations involving the use of anhydrous aluminium chloride. In examples (1) 45 parts of 100 per cent sulphuric acid are heated to 100 DEG C., and 200 parts of the acid sodium salt of 4-chlorphthalic acid added. The temperature is then raised to 200 DEG C., and held there for several hours, until all the water which is formed has distilled off. The 4-chlorphthalic anhydride may be separated after cooling by extraction with benzene, toluene, solvent naphtha or the like. (2) The acid potassium salt of 3-chlorphthalic acid is heated with sulphuric acid to 150 DEG C., and then to 200 DEG C. (3) The acid potassium salt of 3 : 4-dichlorphthalic acid is heated with sulphuric acid to 160 DEG C., and then to 200 DEG C. (4) The calcium salt of 3 : 6-dichlorphthalic acid is heated at 180 DEG C., and then to 200 DEG C., with sulphuric acid. (5) 111 parts of acid sodium 4-chlorphthalate are heated with 120 parts of 30 per cent hydrochloric acid to 100 DEG C., rising to 160 DEG C., and then to 200 DEG C., and further treated as in example (1).
GB3947029A 1929-12-24 1929-12-24 Improvements in and relating to the production of halogen phthalic anhydrides Expired GB347666A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB3947029A GB347666A (en) 1929-12-24 1929-12-24 Improvements in and relating to the production of halogen phthalic anhydrides

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB3947029A GB347666A (en) 1929-12-24 1929-12-24 Improvements in and relating to the production of halogen phthalic anhydrides

Publications (1)

Publication Number Publication Date
GB347666A true GB347666A (en) 1931-04-24

Family

ID=10409722

Family Applications (1)

Application Number Title Priority Date Filing Date
GB3947029A Expired GB347666A (en) 1929-12-24 1929-12-24 Improvements in and relating to the production of halogen phthalic anhydrides

Country Status (1)

Country Link
GB (1) GB347666A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114853705A (en) * 2022-04-24 2022-08-05 河北海力香料股份有限公司 Method for preparing chlorophthalic anhydride by recovering 4-chlorophthalic acid monosodium salt reaction mother liquor

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114853705A (en) * 2022-04-24 2022-08-05 河北海力香料股份有限公司 Method for preparing chlorophthalic anhydride by recovering 4-chlorophthalic acid monosodium salt reaction mother liquor

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