Process Description
Acid gases that are produced from the low-temperature methanol absorption and the sour water stripping processes in the coal chemical industry or from the sour water stripping and amine absorption-regeneration processes in the refining industry contain highly concentrated gaseous H2S and organosulfur compounds. JNEP’s acid gas treatment technology integrates the Claus process with the proprietary EADS Service, significantly reducing the system operating cost benefited from the saleable ammonium sulfate byproduct while achieving a higher SO2 removal efficiency that can satisfy today’s increasingly stringent emissions regulations.
Process Flow
The Claus process is used to remove 93% to 98% of the H2S in acid gas in the form of elemental sulfur. The residual H2S in the tail gas is then completely converted to SO2 through incineration before the tail gas is sent to the ammonia desulfurization system to remove SO2 and produce ammonium sulfate. Oxygen enrichment is suggested if the sulfide content in the acid gas is lower than 35%. If the sulfide content is lower than 5% or the total sulfur production is less than 3 tpd, direct incineration followed by the ammonia desulfurization process is preferred.
Technical Advantages
This simple and efficient process has the advantages of no secondary pollution, operational stability, and low capital and operating costs. Conventional tail gas treatment units (TGTU) based on amine absorption can be conveniently replaced by an ammonia desulfurization unit to reduce air pollutant emissions with a subsequent savings of up to 40% of capital and operating costs.
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Performance
Elemental sulfur recovery ≥ 96%, Sulfur product meets GB/T2449-2006 1st Grade standard;
Total sulfur recovery ≥ 99.96%, Ammonium sulfate product meets GB535-95 standard;
SO2 emissions ≤ 35 mg/Nm3;
NH3 slip ≤ 8 mg/Nm3;
Ammonia recovery ≥ 98%.
