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membrane material and diffuses through the membrane. Thus, the membrane separates gases into residue and permeate streams. Gas absorption membranes are microporous solids used to transport one of the gas constituents to the liquid absorbent. Figure 21. Process schematic for the cleaning of LFG with membrane technology. Source: [41]. The separation is the result of the presence of liquid absorbent on the one side of the membrane, which selectively removes certain components from the gas stream circulating on the other side. The solubility of carbon dioxide is nearly twenty times that of methane, due to the molecular structure of the two compounds. Carbon dioxide passes through the membrane and dissolves in the liquid absorbent, e.g. monoethylamine. Currently various membrane types are available, including porous inorganic, palladium, polymer and zeolite membranes. As single-membrane systems achieve low degree of separation, multi-step systems are commonly employed. In the case of CO2 capture, two types of membrane systems are used: gas separation membranes (made of ceramic and polymer materials) and gas absorption membranes. The downsides of a multi-membrane system include high methane losses. In the membrane-based CO2 separation process, CO2 is obtained in the gaseous form. 72PDF Image | Landfill Gas Energy Technologies
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