Patent ID: 6693225
Filing Date: 2004-02-17
Classification: C07C,C10G

Abstract:
A process for hydrogenating a liquid cut containing hydrocarbons, including unsaturated molecules containing at least two double bonds or at least one triple bond, which comprises:partially hydrogenating the unsaturated molecules containing at least two double bonds or at least one triple bond into less unsaturated molecules containing at least one double bond, in at least one reactor comprising at least two distinct beds of at least one hydrogenation catalyst, wherein a portion of a gas phase containing hydrogen is introduced as a mixture with said cut upstream of the first catalyst bed and a portion thereof is introduced upstream of the subsequent beds contained in said reactor, wherein in the first reactor hydrogenation is carried out in a liquid and gas downflow mode and wherein a gas/liquid mixture from said first reactor is sent to a separation section from which a gas phase is recovered, an aqueous phase is eliminated and a liquid phase is recovered containing the hydrogenated product from said first reactor, at least a portion of which is returned as a mixture with said cut to the inlet to said first reactor upstream of the first catalyst bed contained in said first reactor, wherein the recycle ratio of the portion which is returned to the first reactor is from 10:1 to about 30:1, the recycle ratio being the ratio of the volume flow rate of the recycle to the volume flow rate of the liquid cut feed to said reactor.