Membrane separation for hydrogen production
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What is the highest purity of hydrogen produced by membrane separation at present?
It is possible to achieve 4 nines; of course, the higher the purity, the lower the yield
It is mainly determined by the hydrogen content in the feedstock and the pressure difference between inlet and outlet; in reality, it is about extracting hydrogen rather than producing it. It is very difficult to achieve high levels – 60% for the inlet gas, while initially 80–90% can be attained. There are also those that first use membrane separation in pressure swing adsorption.
Are you conducting theoretical research or applied research? If it’s applied research, don’t even expect to get a 9; getting two 9s is already very difficult
At a pressure of 10–15 MPa, when the hydrogen content in the feed gas to the membrane is 60–70%, the purity after membrane separation can reach around 90–97%. At a pressure of 4–5.5 MPa, when the hydrogen content in the feed gas is 10–20%, the purity after membrane separation is around 30–45%. However, if higher purity is desired, it is not possible to increase the amount of hydrogen; this can be achieved by reducing the valve opening for the permeate gas leaving the membrane.