Design of the “pressure swing adsorption” purification process for crude ethylene gas

I have not designed a pressure swing adsorption process, but I can provide you with some basic guidance. Firstly, pressure swing adsorption is a method for separating gases using an adsorbent, achieved based on the differences in the adsorption properties of various components on the adsorbent. For your situation, where you want to purify ethylene gas to a \"polymerization grade,\" you can use an adsorbent suitable for ethylene adsorption for this purpose. First, you need to select the appropriate adsorbent. For the adsorption of ethylene, adsorbents with high selectivity and high adsorption capacity are typically chosen. For example, 3A molecular sieves exhibit high adsorption capacity and selectivity for ethylene at low temperatures. Meanwhile, depending on the characteristics of the gas components, different combinations of adsorbents can be selected to achieve better separation effects. Secondly, you need to perform process simulation calculations to determine the operating parameters. Common adsorption operation parameters include adsorption temperature, adsorption pressure, feed rate, etc. Through simulation calculations, you can determine the optimal operating parameters to improve the purification efficiency of ethylene. Finally, you can conduct experimental verification based on the simulation results to optimize the process design. Through continuous experimentation and adjustment, the process is gradually optimized to improve the purity of ethylene. I hope the above guidance will be helpful to you. If you have any other questions, feel free to ask. .

Hello, owner. Are you a company or a design firm?

We are a \"company\", a subsidiary of Xi’an Yanchang Petroleum. The idea of using “pressure swing adsorption” to purify polymer-grade “ethylene” is proposed because the cost of producing ethanol from coal is already quite high—reaching 4,500–5,000 yuan per ton. If polymeric-grade ethylene is produced using the ethanol dehydration process to generate ethylene, based on previous \"industrial operation data,\" it takes approximately 1.8 tons of ethanol to produce 1 ton of ethylene. So, excluding other costs, the cost of raw material ethanol alone results in an expense of around 10,000 yuan per ton to produce 1 ton of ethylene. This differs significantly from the cost of ethylene produced by the current mainstream process of producing ethylene via oil cracking. That is why we considered whether technological innovations could be applied to the \"ethylene distillation\" process, which involves high energy consumption and costs: using the \"pressure swing adsorption process\" to purify \"polymer-grade ethylene\". The key issue is that the development of \"new highly selective adsorbents\" is a challenge. It is required to increase the purity of ethylene from around 95% to over 99.90% through a \"pressure swing adsorption process\"! The final operating cost is also lower than that of the currently mainstream \"two-column distillation purification\" process. I urge all friends interested in “innovation in chemical engineering processes” to think about and explore this challenging problem! :handshake

This technology does exist, but it requires high energy consumption and high construction costs; companies lack the necessary determination to adopt it. Generally, technical experts or those involved in process development are also reluctant to develop technical solutions for it – and that’s an objective fact

Support innovation in scientific research and breakthroughs. It is recommended to get in touch with companies in Sichuan’s PSA industry, such as the Southwest Chemical Engineering Design Institute