Hydrogenation process comprising a catalytic distillation zone comprising a reaction zone with distribution of hydrogen
First Claim
1. A process for the treatment of a feed, a major portion of which is constituted by hydrocarbons containing at least 5 carbon atoms per molecule and comprising at least one unsaturated compound containing at most six carbon atoms per molecule including benzene, and treating said feed in a distillation zone comprising a stripping zone and a rectification zone, associated with a hydrogenation reaction zone which is at least partially internal to said distillation zone, in which at least a portion of the unsaturated compounds containing at most six carbon atoms per molecule and contained in the feed are hydrogenated in a catalytic bed in the presence of a hydrogenation catalyst and at least one gas stream comprising hydrogen to cause an effluent which is highly depleted in unsaturated compounds containing at most six carbon atoms per molecule to leave overhead of the distillation zone and an effluent which is depleted in unsaturated compounds containing at most six carbon atoms per molecule to leave from the bottom of the distillation zone, characterized in that each catalytic bed of the internal portion of the hydrogenation zone is traversed by an ascending co-current of said gas stream and liquid, and in that the vapour from the distillation zone is maintained substantially completely out of contact with the catalyst.
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Abstract
The invention concerns a reactive distillation process comprising a distillation zone, associated with a reaction zone which is at least in part internal to said distillation zone and comprises at least one catalytic bed in which the feed is transformed in the presence of a catalyst and at least one gas stream containing hydrogen, characterized in that each catalytic bed in the internal portion of said reaction zone is traversed by said gas stream and liquid in ascending co-current mode. The invention particularly concerns selective hydrogenation processes for light unsaturated hydrocarbons, mainly any olefins and benzene, comprised in a mixture, the major portion of which is constituted by hydrocarbons containing at least five carbon atoms per molecule.
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15 Claims
- 1. A process for the treatment of a feed, a major portion of which is constituted by hydrocarbons containing at least 5 carbon atoms per molecule and comprising at least one unsaturated compound containing at most six carbon atoms per molecule including benzene, and treating said feed in a distillation zone comprising a stripping zone and a rectification zone, associated with a hydrogenation reaction zone which is at least partially internal to said distillation zone, in which at least a portion of the unsaturated compounds containing at most six carbon atoms per molecule and contained in the feed are hydrogenated in a catalytic bed in the presence of a hydrogenation catalyst and at least one gas stream comprising hydrogen to cause an effluent which is highly depleted in unsaturated compounds containing at most six carbon atoms per molecule to leave overhead of the distillation zone and an effluent which is depleted in unsaturated compounds containing at most six carbon atoms per molecule to leave from the bottom of the distillation zone, characterized in that each catalytic bed of the internal portion of the hydrogenation zone is traversed by an ascending co-current of said gas stream and liquid, and in that the vapour from the distillation zone is maintained substantially completely out of contact with the catalyst.
Specification