초록 ▼

A process for treating gas streams containing hydrogen and hydrocarbons. The process includes a membrane conditioning step to remove C.sub.5 -C.sub.8 hydrocarbons, followed by a selective adsorption or membrane separation step to separate hydrogen from methane. The membrane conditioning step uses a

A process for treating gas streams containing hydrogen and hydrocarbons. The process includes a membrane conditioning step to remove C.sub.5 -C.sub.8 hydrocarbons, followed by a selective adsorption or membrane separation step to separate hydrogen from methane. The membrane conditioning step uses a membrane selective for C.sub.5 -C.sub.8 hydrocarbons over hydrogen.

대표청구항 ▼

[ We claim:] [1.] A process for treating a gas containing at least hydrogen, methane and a C.sub.5 -C.sub.8 hydrocarbon and having a first dewpoint of at least 10.degree. C. at 200 psia, said process comprising a membrane conditioning step and a hydrogen/methane separation step;wherein the membrane

[ We claim:] [1.] A process for treating a gas containing at least hydrogen, methane and a C.sub.5 -C.sub.8 hydrocarbon and having a first dewpoint of at least 10.degree. C. at 200 psia, said process comprising a membrane conditioning step and a hydrogen/methane separation step;wherein the membrane conditioning step comprises removing at least a portion of the C.sub.5 -C.sub.8 hydrocarbon from the gas by:(i) passing the gas as a feed stream across the feed side of a polymeric membrane having a feed side and permeate side, and being selective for the C.sub.5 -C.sub.8 hydrocarbon over hydrogen;(ii) withdrawing from the permeate side a permeate stream enriched in C.sub.5 -C.sub.8 hydrocarbon compared with the gas;(iii) withdrawing from the feed side a conditioned residue stream comprising hydrogen and methane and having a second dewpoint at 200 psia at least about 10.degree. C. lower than the first dewpoint;and wherein the hydrogen/methane separation step comprises:(i) passing the conditioned residue stream to a selective adsorption system, thereby selectively adsorbing methane from the gas;(ii) withdrawing a purified hydrogen product stream from the adsorption system;(iii) desorbing and withdrawing a waste gas stream from the adsorption system.