| 摘要 |
A process is disclosed for the isomerization of a C4 feedstock and a C5-C6 feedstock that reduces equipment and operating expenses by utilizing a process flow scheme that provides beneficial heat integration and facilitates the use of a common recovery zone while permitting a wide variation in the relative ratio of a C4 to a C5-C6 feedstock. The isomerization of the C4 feedstock takes place in a separate reaction zone. The effluent from the C4 isomerization zone is heat exchanged against or mixed with the C5-C6 feedstock ahead of an additional isomerization zone that converts the C5-C6 hydrocarbons, and if present, normal C4 hydrocarbons, to more highly branched hydrocarbons. Effluents from both isomerization zones enter a common separation section that removes light gases from the isomerate product. This invention simplifies the simultaneous isomerization of C4 and C5-C6 feedstocks. If offers significant cost and operational advantages to newly designed units and is beneficial in the revamp of existing isomerization units to either add or improve butane isomerization capabilities. For example, butane isomerization capability may be incorporated into an existing C5-C6 isomerization unit by adding as few pieces of major equipment as a butane drier, a feed exchanger, and one or two reactors.
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