H2 recovery and CO2 separation using membrane

A gas treatment system comprising:

• a first pressure swing adsorption (PSA) column to generate a first H2-product gas and a first PSA tail gas from a first feed gas, the first PSA tail gas comprising CO2 and a residual H2;
• a CO2 selective membrane, connected to the first PSA column and configured to separate CO2 from the first PSA tail gas, generating a CO2-rich permeate gas and a CO2-lean rejected gas;
• a second PSA column to generate a second H2-product gas and a second PSA tail gas from a second feed gas, the second PSA tail gas comprising another residual H2;
• a tail gas mixer to mix the CO2-lean rejected gas and the second PSA tail gas, generating a mixed tail gas;
• and
• an H2 selective membrane to separate the residual H2 and the another residual H2 from the mixed tail gas using an H2 selective membrane, generating a recovered H2 permeate gas and a final rejected gas.

An H2 recovery system comprising:

• a steam reformer to generate a first feed gas comprising H2 and CO2, wherein a CO2 concentration of the first feed gas is between 10% and 30%;
• a first pressure swing adsorption (PSA) column to generate a first H2-product gas and a first PSA tail gas from the first feed gas, the first PSA tail gas comprising the CO2 and a residual H2;
• a CO2 selective membrane, connected to the first PSA column and configured to separate CO2 from the first PSA tail gas, generating a CO2-rich permeate gas and a CO2-lean rejected gas;
• an H2 production facility to generate a second feed gas comprising H2, wherein a CO2 concentration of the second feed gas is less than 0.1%;
• a second PSA column to generate a second H2-product gas and a second PSA tail gas from the second feed gas, the second PSA tail gas comprising another residual H2;
• a tail gas mixer to mix the CO2-lean rejected gas and the second PSA tail gas, generating a mixed tail gas;
• an H2 selective membrane to separate the residual H2 and the another residual H2 from the mixed tail gas using an H2 selective membrane, generating a recovered H2 permeate gas and a final rejected gas;
• and
• a feed gas mixer to add the recovered H2 permeate gas to the first feed gas.