Membrane permeate recycle process for use with pressure swing adsorption processes
AssigneeUop LLC
InventorsBradley P. Russell, Gautam Pandey, David A. Wegerer, Wim Elseviers
Life of this patent
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Abstract
Process of treating a net gas stream is disclosed. The process includes sending the net gas stream to a compressor to produce a compressed gas stream. The compressed gas stream is then sent to a pressure swing adsorption unit to produce a hydrogen product stream and a tail gas stream. Tail gas stream from the pressure swing adsorption unit is sent to a first membrane unit to produce a first permeate stream and a first non-permeate stream. Portion of the tail gas stream is sent to a second membrane unit to produce a second permeate stream and a second non-permeate stream.
Claims18
A process of treating a net gas stream comprising:
- sending the net gas stream to a compressor to produce a compressed gas stream;
- sending the compressed gas stream to a pressure swing adsorption unit to produce a hydrogen product stream and a tail gas stream;
- sending a portion of the tail gas stream to a first membrane unit to produce a first permeate stream and a first non-permeate stream;
- sending a portion of the tail gas stream to a second membrane unit to produce a second permeate stream and a second non-permeate stream;
- and
- passing the second permeate stream without further compression to the pressure swing adsorption unit,
- wherein the first membrane unit and the second membrane unit are selective for hydrogen,
- and wherein the second permeate stream from the second membrane unit is recycled to the pressure swing adsorption unit as purge gas.
A process of treating a net gas stream comprising:
- sending the net gas stream to a compressor to produce a compressed gas stream;
- sending the compressed gas stream to a pressure swing adsorption unit to produce a hydrogen product stream and a tail gas stream;
- sending a portion of the tail gas stream to a first membrane unit to produce a first permeate stream and a first non-permeate stream;
- sending a portion of the tail gas stream to a second membrane unit to produce a second permeate stream and a second non-permeate stream;
- passing the second permeate stream without further compression to the pressure swing adsorption unit;
- and
- controlling a flow of the tail gas stream to the first membrane unit and the second membrane unit,
- wherein the first membrane unit and the second membrane unit are selective for hydrogen.
Dependencies are inferred from the claim text.