GB726831A - Improvements in terephthalic acid synthesis - Google Patents

Improvements in terephthalic acid synthesis

Info

Publication number
GB726831A
GB726831A GB468/53A GB46853A GB726831A GB 726831 A GB726831 A GB 726831A GB 468/53 A GB468/53 A GB 468/53A GB 46853 A GB46853 A GB 46853A GB 726831 A GB726831 A GB 726831A
Authority
GB
United Kingdom
Prior art keywords
acid
terephthalic acid
nitric acid
anhydride
terephthalic
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
GB468/53A
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.)
Uniroyal Inc
Original Assignee
United States Rubber Co
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 United States Rubber Co filed Critical United States Rubber Co
Publication of GB726831A publication Critical patent/GB726831A/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
    • C07C51/16—Preparation of carboxylic acids or their salts, halides or anhydrides by oxidation
    • C07C51/27—Preparation of carboxylic acids or their salts, halides or anhydrides by oxidation with oxides of nitrogen or nitrogen-containing mineral acids

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

Terephthalic acid is made by refluxing a mixture of p-xylylene dichloride, nitric acid of 70-100 per cent strength and a saturated aliphatic monocarboxylic acid of 2-6 carbon atoms; the latter holds the reactants in solution but causes precipitation of the terephthalic acid as formed. The process is preferably carried out at a pressure of 1/3 -2 atmospheres above normal. The nitric acid is used in amounts of 1.5-3 times and the carboxylic acid (preferably acetic) 2.5-8 times the weight of p-xylylene dichloride. The latter may be a crude mixture of chloromethylbenzenes (containing also the o-isomer) obtained by chloromethylating benzyl chloride; there are then obtained as by-products phthalic acid (or anhydride) and acids of the diphenylmethane series. After separation of the terephthalic acid the solvent may be recycled and used again, fortified with nitric acid and/or acyl anhydride. Examples are given of the process. The terephthalic acid may be converted into its dimethyl ester. Specifications 623,836 and 644,707 are referred to.
GB468/53A 1952-04-24 1953-01-07 Improvements in terephthalic acid synthesis Expired GB726831A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US726831XA 1952-04-24 1952-04-24

Publications (1)

Publication Number Publication Date
GB726831A true GB726831A (en) 1955-03-23

Family

ID=22109155

Family Applications (1)

Application Number Title Priority Date Filing Date
GB468/53A Expired GB726831A (en) 1952-04-24 1953-01-07 Improvements in terephthalic acid synthesis

Country Status (1)

Country Link
GB (1) GB726831A (en)

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