초록 ▼

A process for treating a gas stream containing an organic component and a second gas. The process uses at least two compression stages, followed by membrane separation, with recirculation of the membrane permeate streams to different points in the compression train. The process provides particular b

A process for treating a gas stream containing an organic component and a second gas. The process uses at least two compression stages, followed by membrane separation, with recirculation of the membrane permeate streams to different points in the compression train. The process provides particular benefits for separations characterized by modest membrane selectivity and a high concentration of the organic component in the remaining gas the compression steps.

대표청구항 ▼

1. A process for separating an organic component from a gas stream, comprising the organic component and a second gas, the process comprising the steps of:(a) passing the gas stream through a first compression stage and a second compression stage in series, thereby forming a compressed stream; (b) w

1. A process for separating an organic component from a gas stream, comprising the organic component and a second gas, the process comprising the steps of:(a) passing the gas stream through a first compression stage and a second compression stage in series, thereby forming a compressed stream; (b) withdrawing at least a portion of the organic component from the compressed stream as a withdrawn stream, thereby leaving a remaining stream; (c) performing a first membrane separation step, comprising: (i) providing a first membrane having a first feed side and a first permeate side; (ii) passing the remaining stream over the first feed side under conditions in which there is a pressure drop between the first feed side and the first permeate side; (iii) withdrawing from the first feed side a first residue stream enriched in the second gas compared with the remaining stream; (iv) withdrawing from the first permeate side a first permeate stream enriched in the organic component compared with the remaining stream; (d) performing a second membrane separation step, comprising: (i) providing a second membrane having a second feed side and a second permeate side; (ii) passing the first residue stream over the second feed side under conditions in which there is a pressure drop between the second feed side and the second permeate side; (iii) withdrawing from the second feed side a second residue stream enriched in the second gas compared with the first residue stream; (iv) withdrawing from the second permeate side a second permeate stream enriched in the organic component compared with the first residue stream; (e) recirculating at least a portion of the first permeate stream to the second compression stage; (f) recirculating at least a portion of the second permeate stream to the first compression stage.