초록 ▼

A semi-permeable gas membrane process is described for the separation of very high purity nitrogen from a process feed gas mixture that is predominantly nitrogen, and one or more other permeable gases, which process comprises providing a feed gas mixture under pressure to a membrane separator unit c

A semi-permeable gas membrane process is described for the separation of very high purity nitrogen from a process feed gas mixture that is predominantly nitrogen, and one or more other permeable gases, which process comprises providing a feed gas mixture under pressure to a membrane separator unit comprising a semi-permeable separation membrane with respect to which the largest fraction of the other permeable gases is at least 20 times more permeable than nitrogen, to provide a very high purity raffinate nitrogen gas product.

대표청구항 ▼

A semi-permeable gas membrane process for the separation of very high purity nitrogen of ≥99.5 vol. % from a process feed gas mixture that is predominantly nitrogen, and one or more other permeable gases, obtained from ammonia production, from stoichiometric combustion, or from combustion gas after

A semi-permeable gas membrane process for the separation of very high purity nitrogen of ≥99.5 vol. % from a process feed gas mixture that is predominantly nitrogen, and one or more other permeable gases, obtained from ammonia production, from stoichiometric combustion, or from combustion gas after treatment by a chemical or catalytic process, such that the O2 content is ≤5 vol. %, which semi-permeable gas membrane process comprises providing said feed gas mixture under pressure to a membrane separator unit comprising a semi-permeable separation membrane with respect to which the largest fraction of the other permeable gases is a least 20 times more permeable than nitrogen, to provide a very high purity raffinate nitrogen gas product of ≥99.5 vol. % nitrogen.