Hydrogen recovery selection
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We need to determine the process route soon, and the hydrogen content requirement is very high – over 99%. The investment in pressure swing adsorption equipment is relatively high; would membranes work instead? Are there any related projects and materials? Gas composition, recovery rate, and pressures of various gases.
Please provide the gas composition and pressure used for treating the gas; generally, a concentration of 99.5% can be achieved using synthetic off-gas for secondary hydrogen extraction.
Membrane recovery is likely to be even more costly
Gases such as 72% hydrogen, nitrogen, CO, CO2, methane, etc., constitute syngas. Why is the investment in membrane separation higher? After all, the pressure swing adsorption equipment is more numerous and larger in size. The control system is more complex, with more additional settings.
This post was last edited by Wuxi Hydrogen Energy on 2011-8-31 at 16:29. The key factor is the CO2 concentration; if the operating pressure is sufficient, membrane separation can achieve a purity of over 99%
6MPA, about 5% CO
Reply to 7# lizhaoye: Membrane separation should be able to achieve a concentration of 99%, and even just one stage of separation is sufficient to accomplish this.
Your company’s systems are under high pressure; a hydrogen membrane system can be used. Its cost is similar to that of PSA, yet it offers better product quality and operational stability compared to PSA. Membrane systems are typically used in high-pressure systems, while PSA has clearer advantages in low-pressure applications!
Reaching 99% with first-stage membranes is not very realistic. A combination of membrane and PSA can be used.
Reply to 10# ChuanQ: As long as the conditions are met, it is entirely possible to achieve a 99% concentration through primary membrane separation; we already have cases of this in our portfolio.