Experimental Study Of Low-temperature And Pressure Swing Adsorption Removal Carbon Dioxide Gas From Natural Gas

With the rapid development of the global population and economic expansion, the energy crisis is also increasing, natural gas because of its clean, quality, safety performance, has been widely used in various industries, such as:important as fossil fuels and chemical raw materials, which usage also increases with an increasing range of applications. However, natural gas in the recently mined, the gas contains large amounts of impurity gases:CO2, H2S, etc. Where the CO2 content of the largest natural gas CO2 affects the use of natural gas products, content is too high will reach the natural gas requirements.In order to solve the carbon problem, natural gas decarbonization technology constantly evolving, as is now the most used alcohol amines, physical adsorption, pressure swing adsorption (PSA), etc., but they all have various problems, such as physical absorption method selectivity is low; chemical absorption method for strong corrosion of equipment and amine serious loss; low up-front investment required for fado, wide area, and the absorption of energy consumption; low product gas concentration membrane separation was needed multi-cascade standing use; PSA law requires the use of a number of adsorption towers side by side. Therefore proposed a new, reasonable decarbonization process is essential to solve the problem now.Combined transport natural gas liquefaction process temperature and PSA technology, low pressure swing adsorption process proposed by CO2 at low temperatures to conduct a pressure swing adsorption, to the new technology can improve the ability of natural gas CO2 removal, it is to enhance its separation factor. Low pressure swing adsorption process is based on the pressure swing adsorption process is proposed, therefore identical with PSA adsorbent is the core of this technology factors.This paper experimentally investigated at low temperature, static pressure swing adsorption of CO2 and CH4 component gas adsorption amount of nine kinds of adsorbents, the effects of temperature and pressure on its adsorption capacity was found for CO2 adsorption, zeolite molecular sieves generally 0? as the dividing line, the adsorption capacity increases first and then decreases phenomenon, and low temperature increases its microporous adsorbent regional context, and adsorption of carbon-based adsorbents, but continues to increase with decreasing temperature Great. Through the CO2 adsorption isotherm analysis, screened four adsorbent material CH4 static adsorption experiments, found that adsorption curve 4 kinds of adsorbent material increases with decreasing temperature, i.e., the adsorption capacity decreases with temperature becomes large.Coconut shell activated carbon and 5A zeolite for dynamic simulation of adsorption was found:coconut shell activated carbon as the temperature decreases or pressure on CO2/CH4 binary mixed gas separation factor will continue to increase, the temperature effect is greater than the pressure of its impact influence, and within a temperature range of dynamic adsorption experiments of CH4 will appear then decreases phenomenon; 5A molecular sieve for CO2/CH4 binary mixed gas separation factor decreases with increasing pressure, lowering when the temperature of the separation factor will show fluctuated, but the overall trend is decreasing.