Abstract: Based on the static measurement results of H2S absorption capacities of MDEA and different ratio sterically hindered amine solutions, the desulfurization performance of MDEA and sterically hindered amine solution with optimized ratio for high sulfur natural gas was investigated in a high gravity desulfurization side-stream apparatus under the conditions of operation pressure of 8.3 MPa and different gas/liquid ratio. The influence of rotating speed of high gravity apparatus on the selective desulfurization was also studied. The results indicate that No.8 solvent exhibits the largest H2S absorption capacity. The absorption capacities of No.8 solvent at 40 ℃ and 50 ℃ are 79.67g/L and 59.20g/L, respectively. The high gravity desulfurization technology can reduce the H2S content from 2.0×105 mg/m3 in raw gas to less than 100 mg/m3 in purified natural gas. At the ratio of gas to liquid of 95, purified gas has the H2S contents of 19.8 mg/m3 and total sulfur contents of 32.27 mg/m3 and CO2 contents of 0.38%, which meets the second category natural gas quality standard.

Key words: high sulfur natural gas, organic sulfur, desulfurization, high gravity desulfurization technology