GB946999A - The prevention and removal of crude maleic acid deposits - Google Patents

The prevention and removal of crude maleic acid deposits

Info

Publication number
GB946999A
GB946999A GB2894761A GB2894761A GB946999A GB 946999 A GB946999 A GB 946999A GB 2894761 A GB2894761 A GB 2894761A GB 2894761 A GB2894761 A GB 2894761A GB 946999 A GB946999 A GB 946999A
Authority
GB
United Kingdom
Prior art keywords
maleic acid
maleic anhydride
crude maleic
deposit
crude
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
GB2894761A
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.)
Scientific Design Co Inc
Original Assignee
Scientific Design Co Inc
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 Scientific Design Co Inc filed Critical Scientific Design Co Inc
Publication of GB946999A publication Critical patent/GB946999A/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

The invention comprises a method of preventing the formation of adhering, solid deposits on a steel surface in contact with a crude maleic anhydride product super-saturated with crude maleic acid containing fumaric acid, resins and tars, by maintaining the steel surface at at least 185 DEG C. and a means for removing a solid crude maleic acid deposit from a steel surface by heating the deposit to at least 185 DEG C. and dispersing it in water maintained at about 100 DEG C. and removing the resultant aqueous dispersion. The crude maleic anhydride product may be obtained by the dehydration by azeotropic distillation with e.g. xylene, of an aqueous maleic acid solution formed by the absorbtion in water of the product of the catalytic partial oxidation of benzene from which some maleic anhydride has been removed by condensation. The deposit may be heated while submerged in a liquid which is preferably maleic anhydride. The preferred temperature is from 185 to 200 DEG C. Examples are provided. Specification 853,849 is referred to.
GB2894761A 1960-08-11 1961-08-10 The prevention and removal of crude maleic acid deposits Expired GB946999A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US4885360A 1960-08-11 1960-08-11

Publications (1)

Publication Number Publication Date
GB946999A true GB946999A (en) 1964-01-15

Family

ID=21956797

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2894761A Expired GB946999A (en) 1960-08-11 1961-08-10 The prevention and removal of crude maleic acid deposits

Country Status (1)

Country Link
GB (1) GB946999A (en)

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