Offgas cleanup in olefin hydroformylation
AssigneeExxonMobil Chemical Patents Inc.
InventorsEddy T. A. Van Driessche, Ronald D. Garton, Raphael F. Caers
Life of this patent
Estimating the term…
Abstract
In the hydroformylation of C5-C14 olefins with cobalt catalyst to produce C6-C15 oxygenates, where offgasses from the hydroformylation or cobalt removal step contain volatile cobalt compounds, the cobalt compounds are recovered by scrubbing the offgas with a liquid, and recycling the liquid to the cobalt removal step. Suitable scrubbing liquids are the organic cobalt-depleted hydroformylation reaction product or a downstream derivative thereof, or an aqueous solution of a Co2+ salt, preferably such salt of formic acid.
Claims17
A process for producing a C6-C15 oxygenate by hydroformylating a C5-C14 olefin feed in the presence of a hydroformylation catalyst comprising a first metal that is cobalt, to form an organic cobalt-containing hydroformylation reaction product (1), which process comprises a demetalling step for removing cobalt from the reaction product (1) thereby producing a cobalt-containing aqueous product (2) and an organic cobalt-depleted reaction product (3), and in which process a gas stream (4) containing volatile cobalt carbonyl is separated from the reaction product (1) and the gas stream (4) is treated with an absorption liquid for absorbing at least part of the volatile cobalt carbonyl contained in the gas, thereby forming a cobalt-containing absorption liquid, characterised in that the cobalt-containing absorption liquid is recycled to the demetalling step.
Dependencies are inferred from the claim text.