Can your factory reduce sulfur content to 0.5 ppm?
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The new liquid hydrocarbon desulfurization system at Wuhan Petrochemical has proven effective. Recently, Wuhan Petrochemical, in collaboration with Workshop 3, installed a new liquid hydrocarbon desulfurization system which has been successfully put into operation; this system is capable of further removing hydrogen sulfide impurities from liquefied gas, and it performs well. As the sulfur content in crude oil continues to rise, the hydrogen sulfide content in liquefied gas products increases accordingly, directly affecting the quality of these liquefied gas products. To this end, the company, in collaboration with Workshop 3, carried out active technical efforts to modify the existing process: liquefied gas was drawn from the top of the liquefied gas desulfurization tower C6302, sent to a newly added liquefied gas coalescer to remove any amine liquids carried along, then to a newly added liquefied gas deep desulfurization unit for further desulfurization, and finally delivered to the liquefied gas finished product storage area. This approach utilizes the reaction between active metal oxides and hydrogen sulfide to accelerate the ionization of hydrogen sulfide, thereby increasing the rate of the desulfurization reaction. After nearly two months of construction, the liquid hydrocarbon desulfurization system was completed and put into operation in early June. After one month of operation, the hydrogen sulfide content in the liquefied gas produced in this facility dropped from 10 ppm to 0.5–1 ppm, thereby providing high-quality raw materials for Sino-Korean Petrochemicals while also meeting the requirements for household-use liquefied gas.
Reducing sulfur content to 0.5 ppm is by no means a difficult task for hydrogenation treatment. As long as the catalyst has sufficient activity, the hydrogen partial pressure is adequate, and the hydrogenation temperature is appropriate, it’s no problem to achieve a hydrogen sulfide level of 0.5 ppm after hydrogenation through thorough stripping. The sulfur content requirements for the raw materials used in reprocessing and refining, as well as for the naphtha used in ethylene cracking, are even stricter than this.
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To maximize efficiency, this amount of removal is determined based on the steps taken