Process for the preparation of a hydrogen-rich stream
A process for the preparation of a hydrogen-rich stream comprising contacting a carbon monoxide-containing gas, methanol and water in at least one shift step in the presence of a catalyst comprising copper, zinc and aluminium and/or chromium at a shift inlet temperature of at least 280° C. and a pressure of at least 2.0 MPa.
1. A process for the preparation of a hydrogen-rich stream comprising reforming a hydrocarbon feed to obtain a carbon monoxide-containing gas, and contacting the carbon monoxide-containing gas, methanol and water in at least one shift step without external addition of heat in the presence of a catalyst comprising copper, zinc and aluminum and/or chromium, at a shift inlet temperature of at least 280° C. and a pressure of at least 2.0 MPa.
2. A process according to claim 1 , wherein the methanol and water are in vapour form.
3. A process according to claim 1 , wherein the methanol and water are in liquid form.
4. A process according to claim 1 , wherein the at least one shift step is a Medium Temperature or High Temperature shift step.
5. A process according to claim 4 , wherein the Medium Temperature or High Temperature shift step is followed by a Low Temperature shift step.
6. Process according to claim 1 , wherein the hydrocarbon feed is pre-reformed before the reforming step.
7. Process according to claim 6 , wherein unreacted methanol is separated from the shift step effluent and re-cycled to the pre-reforming step.
8. Process according to claim 4 , wherein the shift inlet temperature is at least 300° C.