Aldolisation-dehydration process

Details Aldolisation-dehydration process Aldolisation-dehydration process

C - Chemistry, Metallurgy

07

C

C07C 47/21 (2006.01) C07C 45/66 (2006.01) C07C 45/72 (2006.01) C07C 45/74 (2006.01) C07C 45/81 (2006.01) C07C 45/82 (2006.01)

Patent

CA 2133764

An aldolisation-dehydration process is disclosed for converting an aldehyde, e.g. n-valeraldehyde, to a substituted acro- lein, e.g. propyl butyl acrolein (2-propylhept-2-enal). Aldolisation and dehydration are effected in a stirred tank reactor (16; 111) using an alkali catalyst, such as sodium hydroxide. A reaction product stream (23; 113) containing both organic and aqueous phases is distilled (in column 25; 123) to yield a heterogeneous azeotrope containing water and aldehyde. On condensation and phase separation the lower water layer (34; 150) can be discharged from the plant without the need for neutralisation. From the bottom of the distillation zone a mixture (36; 157) of substituted acrolein and alkali catalyst solution is obtained. The substituted acrolein is recovered as product (45; 173), while the catalyst solution (47; 175) is recycled to the aldolisation reactor. Part (49; 181) of the catalyst solution is purged to control the level of Cannizzaro reaction products.

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