GB695958A - Improvements in or relating to dehydration of maleic acid to maleic anhydride - Google Patents

Improvements in or relating to dehydration of maleic acid to maleic anhydride

Info

Publication number
GB695958A
GB695958A GB14955/50A GB1495550A GB695958A GB 695958 A GB695958 A GB 695958A GB 14955/50 A GB14955/50 A GB 14955/50A GB 1495550 A GB1495550 A GB 1495550A GB 695958 A GB695958 A GB 695958A
Authority
GB
United Kingdom
Prior art keywords
maleic anhydride
pool
maleic
acid
vapour
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
GB14955/50A
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.)
Monsanto Chemicals Ltd
Monsanto Chemical Co
Original Assignee
Monsanto Chemicals Ltd
Monsanto Chemical 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 Monsanto Chemicals Ltd, Monsanto Chemical Co filed Critical Monsanto Chemicals Ltd
Publication of GB695958A publication Critical patent/GB695958A/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

Maleic anhydride is prepared by feeding an aqueous solution or slurry of maleic acid into a pool of maleic anhydride containing not more than 15 per cent by weight of water whether in the free state or combined in the form of maleic acid or fumaric acid, maintaining the pool under conditions of partial reflux, thereby condensing the maleic anhydride in the vapours and removing at least the greater part of the water vapour from the refluxing system so that the water in the pool does not exceed said 15 per cent value. The refluxing pool of maleic anhydride is preferably maintained at 125-185 DEG C. and under an appropriately reduced pressure to cause boiling. The reflux condenser temperature is in general maintained at 65-100 DEG C. The maleic acid feed preferably contains at least 40 per cent maleic acid. This feed, which may be preheated to temperatures up to 105 DEG C., is preferably introduced continuously or intermittently via a pipe terminating below the surface of the boiling pool of anhydride. Generally, conditions are such that the weight of maleic anhydride and acid in the vapour above the boiling pool is at least twice and preferably at least six times the weight of the water vapour. Substantially all the maleic anhydride vapour is condensed while the water vapour is allowed to escape from the condensing system. The process may be operated continuously, maleic anhydride being withdrawn either from the boiling pool or from the condensing system. Examples are given.
GB14955/50A 1949-06-29 1950-06-15 Improvements in or relating to dehydration of maleic acid to maleic anhydride Expired GB695958A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US695958XA 1949-06-29 1949-06-29

Publications (1)

Publication Number Publication Date
GB695958A true GB695958A (en) 1953-08-19

Family

ID=22090009

Family Applications (1)

Application Number Title Priority Date Filing Date
GB14955/50A Expired GB695958A (en) 1949-06-29 1950-06-15 Improvements in or relating to dehydration of maleic acid to maleic anhydride

Country Status (1)

Country Link
GB (1) GB695958A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1194838B (en) * 1961-03-07 1965-06-16 Basf Ag Process for the production of pure maleic anhydride free of fumaric acid from maleic acid or its aqueous solutions

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1194838B (en) * 1961-03-07 1965-06-16 Basf Ag Process for the production of pure maleic anhydride free of fumaric acid from maleic acid or its aqueous solutions

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