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Economic Benefits • Low energy consumption, does not consume water or create contaminated waste water. Does not require any heat. • High purity levels • Relatively low investment and maintenance costs Common Adsorption Materials Adsorbents are usually very porous materials because of their large surface areas. Adsorbent material will need to be replaced once it is filled or when it has reached its regenerated limit. In general, adsorbent material require minimal maintenance and are inexpensive. The setup is simple: adsorbent material is place in a drum with a gas inlet and an outlet. The two main criteria for an attractive adsorption material: • Have a high selectivity to CO2. We want the material to have a higher affinity towards CO2 than methane. • Be of a material that has pores that CO2 can penetrate their structure, while larger CH4 molecules have size limitations to diffuse through them. These materials are called kinetic adsorbents because their selectivity mechanism is through diffusion constraints. Zeolites: • One of the most common adsorbents used in PSA • Naturally occurring or synthetic silicates with uniform pore size and dimensions. • They work best with polar compounds such as H2S, SO2, NH3, carbonyl sulfide, mercaptans PG&E GAS R&D AND INNOVATION TECHNICAL ANALYSIS: PRESSURE SWING ADSORPTION “PG&E” refers to Pacific Gas and Electric Company, a subsidiary of PG&E Corporation. © 2019 Pacific Gas and Electric Company. All rights reserved. PAGE 7 OF 12PDF Image | Pressure Swing Adsorption Technical Analysis
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