Patent ID: 7935851

Claim:
A process comprising: i) feeding a C 4 stream comprising butene-1 and at least 15 wt % isobutylene to a hydroformylation reactor, ii) hydroformylating the C 4 feed under conditions that converts at least 65% of the butene-1 and converts no more than 5% of the isobutylene to produce a hydroformylation mixture comprising isobutylene and a hydroformylation product selected from the group consisting of valeraldehyde, pentanol and mixtures thereof; and iii) separating the hydroformylation product from the isobutylene; wherein the conditions comprise: a) a temperature in the range from 80 to 130° C.; b) a total pressure of not more than 5000 kPa; c) a partial pressure of carbon monoxide below 150 kPa; and d) a partial pressure of hydrogen in the range from 100 to 800 kPa.