MEMBRANE AND NON-MEMBRANE SOUR GAS TREATMENT PROCESS

摘要

Improved processes for treating gas streams containing hydrogen sulfide, carbon dioxide, water vapor, and methane, particularlynatural gas streams. The processes rely on the availability of two membrane types, one of which has a hydrogen sulfide/methane selectivityof at least about 40 when measured with multicomponent gas mixtures at high pressure. Based on the different permeation properties of thetwo membrane types, optimized separation processes can be designed. The membrane separation is combined with non-membrane treatmentof the residue and/or permeate streams.