Process for recovering aldehyde obtained by hydroformulation in two columns with increasing pressure

Abstract

A process for the separation of an aldehyde and a second component from a feed stream (3a, 3b, 3c) comprising the aldehyde and the second component, said process comprising: providing the feed stream to one or both of a first separation vessel (1) operating at a first pressure and a second separation vessel (2) operating at a second pressure wherein said second pressure (2) is greater than said first pressure; operating said first separation vessel (1) and said second separation vessel (2) such that separation occurs; recovering an aldehyde product stream (4) from at or near the bottom of the first separation vessel (1), said aldehyde product stream (4) having a concentration of aldehyde which is higher than that in the feed stream (3a, 3b, 3c); recovering a second component stream (8) from at or near the top of the second separation vessel (2), said second component stream having a concentration of second component which is higher than in the feed stream (3a, 3b, 3c); removing a first recycle stream (5, 6) from at or near the top of the first separation vessel (1) and feeding it to the second separation vessel (2); and removing a second recycle stream (9, 10) from at or near the bottom of the second separation vessel (2) and feeding it to the first separation vessel (1).

Dependencies are inferred from the claim text.