DE3471923D1 - Process for the preparation of maleic anhydride - Google Patents
Process for the preparation of maleic anhydrideInfo
- 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
Links
Landscapes
- 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.
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) |
-
1984
- 1984-08-28 AT AT84110197T patent/ATE34971T1/en not_active IP Right Cessation
- 1984-08-28 DE DE8484110197T patent/DE3471923D1/en not_active Expired
Also Published As
Publication number | Publication date |
---|---|
ATE34971T1 (en) | 1988-06-15 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
8364 | No opposition during term of opposition | ||
8339 | Ceased/non-payment of the annual fee |