Importance

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Abstract

This application provides processes for recovering hydrogen, ethylene and ethane from dry gas or separating ethylene cracked gas from dry gas of refinery plants, wherein a hydrating separation may be combined with for example a freezing or absorbing separation so as to separate a multiple gas mixture. The process may include for example: providing a dry gas or ethylene cracked gas to be separated by hydrating separation into a hydrating reactor to produce a hydrate comprising methane and nitrogen and a first gas mixture comprising hydrogen, ethane, and ethylene; removing the hydrate from the first gas phase mixture; further separating the first gas phase mixture of comprising hydrogen, ethylene and ethane in a conventional freezing or absorbing separation; and providing the hydrate produced in the hydration reactor into a hydrate decomposer wherein the hydrate is decomposed under the conditions of heating or decompression to obtain a second gas mixture comprising methane and nitrogen and less amount of ethane and ethylene.

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First Claim