C - Chemistry – Metallurgy – 07 – C
Patent
C - Chemistry, Metallurgy
07
C
260/719.3
C07C 11/09 (2006.01) C07C 7/148 (2006.01) C07C 41/42 (2006.01)
Patent
CA 1115737
ABSTRACT OF THE DISCLOSURE A process for obtaining isobutene from a C4-hy- drocarbon mixture containing isobutene, which comprises (a) reacting the mixture 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-hydro- carbon mixture, with or without prior mixing, to an etherifi- cation reaction zone which contains the ion exchanger; (b) distilling 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 com- prising the unconverted hydrocarbons such top product being substantially free from isobutene and the primary C3- or C4-al- cohol 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; (c) 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; (d) feeding the mixture of isobu- tene and primary C3- and C4-alcohol produced in step (c) to a second distillation zone, taking off as the top product isobutene and as the bottom product the remaining C3- or C4-alcohol produced in step (c); and (e) recyoling the primary C3- or C4-alcohol which is the bottom product of step (d) to the etherification reaction zone.
318369
Brunner Erwin
Lindner Alfred
Merger Franz
Sandrock Gerhard
Schubert Eckart
Basf Aktiengesellschaft
Robic Robic & Associes/associates
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