DE3471923D1 - Process for the preparation of maleic anhydride - Google Patents

Process for the preparation of maleic anhydride

Info

Publication number
DE3471923D1
DE3471923D1 DE8484110197T DE3471923T DE3471923D1 DE 3471923 D1 DE3471923 D1 DE 3471923D1 DE 8484110197 T DE8484110197 T DE 8484110197T DE 3471923 T DE3471923 T DE 3471923T DE 3471923 D1 DE3471923 D1 DE 3471923D1
Authority
DE
Germany
Prior art keywords
sepg
mixt
temp
introducing
organic phase
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
DE8484110197T
Other languages
German (de)
Inventor
Fritz Dr Gude
Praun Ferdinand Dr Von
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.)
Huels AG
Original Assignee
Huels AG
Chemische Werke Huels AG
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 Huels AG, Chemische Werke Huels AG filed Critical Huels AG
Priority claimed from EP19840110197 external-priority patent/EP0174379B1/en
Application granted granted Critical
Publication of DE3471923D1 publication Critical patent/DE3471923D1/en
Expired legal-status Critical Current

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  • Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)

Abstract

Maleic anhydride (MA) is produced by catalytic air oxidn. of suitable hydrocarbons (e.g. butene, butane, butadiene and/or benzene) at 300-450 deg.C, followed by (a) opt. separating part of the MA by cooling to a temp. above the dew point of the accompanying H2O, (b) extracting with a water-insoluble tert. amine (I), and (c) heating the extract at 120-180 deg.C under vacuum to recover the MA. Step (b) is effected by (i) introducing the air stream contg. MA and H2O vapour at a temp. below the dew point of the H2O, opt. after adding more H2O, into a mixt. of (I) and a hydrocarbon water-azeotroping agent, and sepg. the organic phase, or (ii) introducing the air stream at a temp. above the dew point of the H2O into a mixt. of (I) and an alcohol with a low vapour pressure, and sepg. the organic phase, or (iii) introducing the air stream into H2O, extracting the maleic acid with a mixt. of (I) and a hydrocarbon water-azeotroping agent, and sepg. the organic phase. (I) must have a pKa of less than 9. In cases (i) and (ii), it must be an air-stable amine with prim. aliphatic gps. branched at the 2 posn. (I) is tri(2-ethylhexyl)amine (Ia). The azeotroping agent is an aromatic hydrocarbon, e.g. xylene or diethylbenzene. Pref. alcohols are (iso)decanol, lauryl, myristyl or palmityl alcohol or diethylene glycol monobutyl ether.
DE8484110197T 1984-08-28 1984-08-28 Process for the preparation of maleic anhydride Expired DE3471923D1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP19840110197 EP0174379B1 (en) 1983-06-16 1984-08-28 Process for the preparation of maleic anhydride

Publications (1)

Publication Number Publication Date
DE3471923D1 true DE3471923D1 (en) 1988-07-14

Family

ID=8192132

Family Applications (1)

Application Number Title Priority Date Filing Date
DE8484110197T Expired DE3471923D1 (en) 1984-08-28 1984-08-28 Process for the preparation of maleic anhydride

Country Status (2)

Country Link
AT (1) ATE34971T1 (en)
DE (1) DE3471923D1 (en)

Also Published As

Publication number Publication date
ATE34971T1 (en) 1988-06-15

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