How does the PSA process separate the following gases
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I would like to ask everyone: How can pressure swing adsorption be used to separate the process gases listed below? Which adsorbent to choose? At what temperature and pressure does adsorption and desorption occur? The known gas components are: H2 96.44%, CH4 0.35%, C2H6 0.44%, C3H8 1.37%, isobutane 0.29%, n-butane 0.81%, isopentane 0.13%, and n-pentane 0.17%.
Please recommend adsorbents and the cost of the overall equipment.
This is relatively simple. All impurities other than hydrogen can be completely removed. The product gas requires hydrogen; please provide the flow rate and pressure of the feed gas, as well as the purity and yield of the product hydrogen. The original poster can send their contact information to my email scly8844@163.com if they wish; thank you.
This post was last edited by Wenwu6963 on 2016-2-17 at 10:03. Pressure swing adsorption takes place at room temperature. A higher pressure is beneficial for the adsorption process, and a decision can be made based on the actual circumstances. Desorption can be carried out using a flushing or vacuum process, as determined by actual needs. The selection of an adsorbent depends not only on the composition of the gas, but also on factors such as the flow rate, pressure, and temperature of the process gas, as well as requirements regarding the purity of the produced hydrogen, the recovery rate, and the allowable levels of harmful gases (such as sulfides). The scale of the facility and investment also require the aforementioned information. If necessary, please take a look at the messages I sent you; I can prepare a preliminary plan for you based on the actual situation.
With the help of experts, I also need a processing equipment to separate nitrogen from natural gas (the final dry gas). The main components of this dry gas are C1/C2 compounds, with a nitrogen content ranging from 5% to 18%. What is needed is a rough separation of nitrogen from the dry gas, so that the nitrogen content remains at no more than 2% to 3%. The volume of dry gas produced is 400,000 units per day, at a pressure of 1.2 to 2.3 MPa. What is the best process technology for this purpose? Which device offers the best cost-performance ratio?
Freezing processes and pressure swing adsorption can be employed. The former utilizes the different liquefaction temperatures of various substances for separation; it is a mature and reliable technology with high recovery rates, but the overall operating costs, including energy consumption, are relatively high. The latter requires less investment and has very low operating costs, but its effective gas recovery rate is relatively lower.
The initial investment in cryogenic adsorption equipment is too high; it is generally used for LNG gas purification. What we need to do is to control the nitrogen content in the dry gas to be exported, ensuring that it does not exceed 2–3%. The requirements are not stringent, but since the volume of gas to be exported is large, it is necessary to choose a technical approach and equipment that offers good cost-performance, relatively low investment costs, and simple operation at low expenses. Could any expert among you provide us with a rough strategy and estimate? Thank you
It’s the PSA hydrogen production process – it’s quite mature. For engineering projects, one can simply consult the manufacturers for technical solutions.