Cobalt recovery from cobalt catalysed hydroformylation...

Details Cobalt recovery from cobalt catalysed hydroformylation... Cobalt recovery from cobalt catalysed hydroformylation...

2011-03-22

2011-03-22

Witherspoon, Sikarl A (Department: 1621)

Organic compounds -- part of the class 532-570 series

Organic compounds

Oxygen containing

C568S909000, C568S451000, C560S098000, C560S127000

Reexamination Certificate

active

07910782

ABSTRACT:
In a hydroformylation reaction, the circulation and recovery of cobalt carbonyl in a cobalt catalyst cycle using carbonylate as an intermediate and acidification thereof, is improved by supplying an aqueous sulfuric acid solution containing less than 16% wt of sulfuric acid to the carbonylate to control sulfuric acid concentration in the carbonylate/acid mixture, before accounting for any acid consuming reaction, to a value of from 2% to 10% by weight. Single step and multistage liquid/liquid extraction techniques as well as vapor/liquid extraction techniques followed by the absorption of cobalt from the vapor in an organic liquid both benefit from this improvement.

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