Abstract: UDS-II complex solvent is used by Yuanba Natural Gas Treating Plant to remove impurities such as H2S, CO2 and organic sulfur in the raw natural gas. The treated gas can meet the first class specification of Natural Gas (GB 17820-2012). With the more and more stringent environmental protection requirements in China, a new edition of Natural Gas (GB 17820-2018) was issued in 2018 and the natural gas product of Yuanba Natural Gas Treating Plant couldn’t meet the requirements of the new standard. Combined with the characteristics of the natural gas desulfurization process and the natural gas product of the plant, the impact of the new standard on the plant was analyzed. Additional COS hydrolysis or molecular sieve desulfurization facilities can effectively improve the product quality and meet the requirements of the new standard. To further reduce the total sulfur content of natural gas product, the development of natural gas treating technology shall be strengthened continuously.

Key words: natural gas desulfurization, molecular sieve, COS hydrolysis, complex solvent