초록 ▼

Processes are disclosed for the separation of light hydrocarbons from a feedstream containing hydrogen, light hydrocarbons and heavy hydrocarbons. The processes employ thermal swing adsorption zone to adsorb heavy hydrocarbons and a pressure swing adsorption zone to remove the remaining light hydroc

Processes are disclosed for the separation of light hydrocarbons from a feedstream containing hydrogen, light hydrocarbons and heavy hydrocarbons. The processes employ thermal swing adsorption zone to adsorb heavy hydrocarbons and a pressure swing adsorption zone to remove the remaining light hydrocarbons. At least a portion of the product from the pressure swing adsorption zone is used to purge the thermal swing adsorption zone. Specific applications of the process of the present invention are disclosed with relation to hydrodealkylation processes and dehydrocyclodimerization processes.

대표청구항 ▼

A hydrocarbon conversion process comprising: (a) passing a reactor feed comprising feed hydrocarbons and a recycle stream as hereinafter characterized, to a reaction zone maintained at effective conditions to convert the feed hydrocarbons to product hydrocarbons, said product hydrocarbons having a d

A hydrocarbon conversion process comprising: (a) passing a reactor feed comprising feed hydrocarbons and a recycle stream as hereinafter characterized, to a reaction zone maintained at effective conditions to convert the feed hydrocarbons to product hydrocarbons, said product hydrocarbons having a different chemical composition than the feed hydrocarbons and having a C1-C5 hydrocarbon fraction and a C6+hydrocarbon fraction, and withdrawing a reactor product comprising hydrogen and the product hydrocarbons; (b) passing at least a portion of the reactor product through a first adsorption zone containing solid adsorbent at a temperature sufficient to adsorb at least a portion of the C6+hydrocarbon fraction and withdrawing a first adsorption effluent stream comprising hydrogen and at least a portion of the C1-C5 hydrocarbons fraction; (c) passing the first adsorption effluent stream through a second adsorption zone containing solid adsorbent at a pressure sufficient to adsorb at least a portion of the C1-C5 hydrocarbon fraction and withdrawing a second adsorption effluent stream comprising hydrogen; (d) heating at least a substantial portion of the second adsorption effluent to a temperature sufficient to desorb at least a portion of the C6+hydrocarbon fraction, passing the heated portion to said first adsorption zone and withdrawing a first desorption effluent stream comprising hydrogen and at least a portion of the C6+hydrocarbon fraction; (e) reducing the pressure in the second adsorption zone to a pressure sufficient to desorb at least a portion of the C1-C5 hydrocarbon fraction therefrom and withdrawing a second desorption effluent comprising at least a portion of the C1-C5 hydrocarbon fraction; and (f) passing a portion of the first desorption effluent stream to the reaction zone to comprise the recycle stream.