Abstract：In order to reduce the emission of H2S from the flare gas of the refinery and utilize the removed H2S as resource to ensure the economically feasible of the developed process, a process was developed for deep desulphurization of 1.5×108 Nm3/a flare gas from oil refinery by methyldiethanolamine (MDEA) method and production of 3 600 t/a methanethiol by utilization of concentrated H2S as a resource. The magnetic-driven super-gravity rotating packed-bed and the half-desorption coupled desorption process were chosen to improve the desulfurization efficiency and the H2S enrichment degree. The synthesis process of methanthiol from dimethyl sulfide, the recontact column for removal of H2S and the pressure-swing distillation process ensured the high recovery and the quality of the main- and by-products. The heat pump system in the desorption column, the double-effect distillation for separation of methanol and water and the optimization of the heat-exchange network effectively reduced the energy consumption of the developed process. The simulation results showed that the concentration of SO2 in the exhausted waste gas from the designed process was 21.9 mg/Nm3. Both the energy consumption per unit product of 3 870.2 kgce and the energy consumption of per 10 000 yuan output value of 2 369.4 kgce are superior to the resource utilization targets of chemical demonstration projects in the 13th five-year plan.
Xu Lei,Meng Chengwei,Feng Shaohua et al. Deep Desulphurization of Flare Gas from Oil Refinery and Recovery of Hydrogen Sulfide to Producing Methanthiol[J]. 化学反应工程与工艺, 2018, 34(6): 489-498.
