Application of catalysts CT6-4B and CT6-8B in sulfur recovery unit

Aiming at the high mass concentration of SO₂ in flue gas discharged from the 60×10³t/a sulfur recovery unit in Guangxi Petrochemical Company, it was determined that the reason was the decrease of organic sulfur hydrolysis rate of the catalyst in the primary converter through multiple means of investigation and analysis, which caused the high organic sulfurcontent in the process gas. After replacing the catalysts of CT6-4B and CT6-8B for sulfur recovery developed and produced independently by Research Institute of Natural Gas Technology, PetroChina Southwest Oil & Gasfield Company, the results showed that the organic sulfur hydrolysis rate was greatly increased, and the mass concentration of SO₂ in flue gas emissions decreased from nearly 400 mg/m³ to less than 120 mg/m³, meeting the emissions limits requirement of below 400 mg/m³ in Guangxi region specified by GB 31570 - 2015 Emission Standard of Pollutants for Petroleum Refining Industry.