C - Chemistry – Metallurgy – 07 – C
Patent
C - Chemistry, Metallurgy
07
C
202/84, 260/719.
C07C 11/09 (2006.01) C07C 7/148 (2006.01) C07C 41/06 (2006.01)
Patent
CA 1142554
ABSTRACT OF THE DISCLOSURE: The present invention is concerned with a process for obtaining isobutene from a C4-hydrocarbon mixture contain- ing isobutene, which comprises the steps for reacting the mixture continuously with a primary C3-or C4-alcohol in the presence of an ion exchanger in its acid form as a condensing agent to form the corresponding C3- or C4-alkyl tert-butyl ether by feeding the primary C3- or C4-alcohol and the C4- hydrocarbon mixture with or without prior mixing, to an etherification reaction zone which contains the ion exchanger, while maintaining the exit temperature of the reaction mixture from the etherification reaction zone at from 25 to 65°C and the quotient of the volume of the etherification reaction zone and the throughput of the C4-hydrocarbon mixture and the primary C3- or C4-alcohol at from 0.01 to 5 hours; distil- ling the reaction mixture obtained from the etherification reaction zone in a first distillation zone, taking off as the top product without water washing a C4-hydrocarbon mixture comprising the unconverted hydrocarbons and not more than 1,000 ppm by weight of the primary C3- or C4-alcohol and taking off as the bottom product the resulting C3- or C4- alkyl tert-butyl ether, which may contain therein primary C3- or C4-alcohol which may have been added in excess; feeding the bottom product to a second reaction zone, containing an acid catalyst, in which the C3- or C4-alkyl tert-butyl ether is decomposed at an elevated temperature to give isobutene and primary C3- and C4-alcohol; feeding the mixture of isobutene and primary C3- and C4-alcohol produced in the decomposition step to a second distillation zone, taking off as the top product without a water wash isobutene contain- ing not more than 500 ppm by weight of primary C3-or C4- alcohol and taking off as the bottom product the remaining primary C3- or C4-alcohol produced in step (c); and recycling the primary C3- or C4-alcohol which is the bottom product of step (d) to the etherification reaction zone.
355096
Brunner Erwin
Lindner Alfred
Merger Franz
Sandrock Gerhard
Schubert Eckart
Basf Aktiengesellschaft
Robic Robic & Associes/associates
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