Hydrogen separation from steam methane reforming off-gas by four-bed pressure swing adsorption process
- Hydrogen separation from steam methane reforming off-gas by four-bed pressure swing adsorption process
- 장성철; 양세일; 홍성안; 오성근; 최대기
- PSA; hydrogen separation; methane reforming; adsorption
- Issue Date
- The 6th International Conference on Separation Science & Technology
- , 120-120
- Hydrogen is increasingly demanded in various fields, including fuel cells, semiconductor processing, and the petrochemical industry. When steam reforming technology has been applied to produce hydrogen, it is very important to remove other impurities (mainly CO, CO2 and CH4) using adsorption separation technology, which is generally considered to be low in energy consumption and very precise in H2 separation (99.99%) with the aid of pore size and surface characteristics of adsorbent. Pressure swing adsorption (PSA) has been extensively used in the industry to obtain the desired product by separation and purification .
To obtain a high purity product from a multi-component feed, commercialized H2 PSA processes have been applied to the simultaneous use of various types of adsorbents, because different adsorbents show different selectivity depending on the adsorbate . Therefore, an important characteristic of the H2 PSA process is that many different adsorbents are used in multiple layered beds. A layered bed was applied to a PSA process for improvement in efficiency and showed that the yield and productivity of the PSA process using double-layered beds was strongly dependent on the relative layer lengts. The adsorption dynamics in the bed and its optimal design were studied from the experiment and simulation in the layered bed for H2 mixture separation.
The PSA process using a layered bed of activated carbon and zeolite 5A were studied to produce a high purity hydrogen product from the steam methane reforming off-gas. The non-isothermal, bulk separation PSA model adopted the linear driving force approximation for the particle uptake and the adsorption isotherm used the Dual-Site Langmuir.
Both experiment and simulation reveal that a layered bed of activated carbon and zeolite 5A can maximize utilization of adsorbent compared to a single adsorbent bed. When the total cycle time increased, the recovery at de
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