Abstract
Natural gas consists of a mixture of hydrocarbons with the largest share of methane, and non-hydrocarbon impure components such as N2, CO2 and H2S. In order to fulfill the gas market requirements, it is necessary to separate these unwanted components from the natural gas stream. There are several available technologies for the separation of CO2 from natural gas, such as: polymeric membranes, cryogenic distillation, absorption and adsorption. In this paper is presented the mechanism of CO2 separation using membrane technology, as well as the process of separation CO2 depending on the number of membranes in the system for a typical gas reservoir in Serbia.
Highlights
Natural gas is a mixture of hydrocarbons with the highest proportion of methane and variable amounts of non-hydrocarbon components such as acid gases (CO2, H2S)
Factors influencing gas separation using membrane technology are the share of CO2 in the mixture, membrane material and the operating conditions (Peters et al, 2011)
The parameter Di/Dj represents the ratio of the diffusion coefficients of the two gases and can be characterized as a membrane selectivity based on the mobility of individual molecules (Baker, 2006)
Summary
Natural gas is a mixture of hydrocarbons with the highest proportion of methane and variable amounts of non-hydrocarbon components such as acid gases (CO2, H2S). The average composition of natural gas in Serbia expressed in mol% is: 96,184 of C1, 1,624 of C2, 0,508 of i-C4, 0,018 of n-C4, 0,018 of i-C5, 0,012 of n-C5, 0,019 of C6 +, 0,99 of N2 and 0,471 of CO2 (Srbijagas-a). The natural produced gas must meet certain requirements such as composition, calorific value, and pressure. The maximum allowed value of CO2 in the gas can be 2 mol%, while the value of N2 is 3 mol% (Srbijagas-b). Removing impurities from natural gas increases the calorific value and reduces the volume of gas for transport. Available technologies for separation CO2 from natural gas are membranes, cryogenic distillation, absorption, and adsorption. The removed CO2 and N2 can be injected into hydrocarbon reservoirs in order to increase the
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