Progress of natural gas desulfurization technology

1.3.2 Thiobacillus azotizans (SHel-PaQUES process)

The process, developed jointly by Dutch company Paqu and Shell, uses thiobacillus denitriformis to remove hydrogen sulfide under alkaline conditions. The company's original Thiopaq process is used for desulfurization of refinery gas, biogas, etc. Shelpaq is the name given to natural gas, syngas, and Klaus exhaust treatment applications, where the process has been successfully used since 1993 for the desulfurization of biogas (a mixture of CH4, C02, and H2S). After the experiment of long-term treatment of high-pressure natural gas in the experimental plant, it is proved that the process runs smoothly, and its cost is about 100 US dollars /t of sulfur, which is suitable for treating 5013000kg/d of H2S. The technique uses lye to absorb hydrogen sulfide, since thiobacillus azotica can survive in both aerobic and anaerobic conditions, under aerobic conditions.