Patent ID: 9631154
Date: 2017-04-25
CPC Classifications: B01D,C10L,Y02C

Claim:
1. A method of removing acid gas from natural gas, comprising the steps of: supplying natural gas having a first concentration of acid gas to a first side of a first membrane; supplying a physical solvent to a second side of the first membrane; transferring acid gas from the natural gas through the first membrane from the first side to the second side, yielding natural gas having a second concentration of acid gas on the first side of the first membrane, the second concentration being lower than the first concentration; supplying the natural gas having the second concentration of acid gas to a first side of a second membrane; supplying a chemical solvent to a second side of the second membrane; transferring acid gas from the natural gas having the second concentration through the second membrane, from the first side to the second side of the second membrane, yielding natural gas having a third concentration of acid gas on the first side of the second membrane, the third concentration being lower than the second concentration; and recovering the natural gas having the third concentration of acid gas from the first side of the second membrane.