选择性加氢脱硫生产高品质汽油的关键工艺参数

KEY PARAMETERS IN PRODUCTION OF HIGH QUALITY GASOLINE BY SELECTIVE HDS PROCESS

介绍了中国石化青岛石油化工有限责任公司（青岛石化）采用中国石化石油化工科学研究院开发的调控技术（RSAT）生产的选择性加氢脱硫催化剂后生产满足国Ⅴ排放标准汽油的关键工艺参数的控制方案,包括关键指标轻、重汽油分馏单元切割点的选择以及分馏精度的控制、轻汽油碱抽提脱硫醇单元各参数的控制及轻汽油碱抽提脱硫醇后硫含量的控制、重汽油加氢脱硫单元各参数的控制及加氢后重汽油硫含量的控制。针对青岛石化催化裂化汽油,轻、重汽油切割点以50~60℃,质量比以1∶4为宜;轻汽油碱抽提脱硫醇单元要求其中硫醇硫基本被全部抽提,控制加氢后重汽油硫质量分数小于10μg/g且与碱抽提后轻汽油混合后全馏分汽油产品硫质量分数小于10μg/g。结果表明,采用RSAT生产的选择性加氢脱硫催化剂及对各单元产品质量要求和参数进行优化和精心控制,实现了满足国Ⅴ排放标准汽油的生产。可将硫质量分数从原料的700~853μg/g降至8~9μg/g时,产品辛烷值损失1.4~1.5个单位。满足国Ⅴ排放标准汽油的生产成功,为下一步全面采用RSDS-Ⅲ技术并长期稳定生产满足国Ⅴ排放标准汽油打下了基础。

To produce national phaseⅤ gasoline from FCC naphtha,the key operation parameters of the units in the selective hydrodesulfurization process were strictly regulated as a whole,like cutting point,fractionation precision,sulfur content of light gasoline from alkali extraction unit,sulfur content of heavy gasoline from hydrodesulfurization unit.The process adopts the selective HDS catalyst made by the regulation technology（RSAT）developed by Research Institufe of petroleum Procesing.The optimal operation conditions are：cutting point is 50-60℃ with a mass ratio of 1∶4（light/heavy）,mercaptan sulfur in light gasoline from alkali extraction unit is close to nil,sulfur content of heavy gasoline hydrodesulfurized is less than 10μg/g.The sulfur content of the mixture of alkali extracted light gasoline with selective hydrodesulfurized gasoline is less than 10μg/g.Based on above conditions,the sulfur content can be reduced from 700-853μg/g in feed to 8-9μg/g in the product and the gasoline octane number loss is 1.4-1.5.The national phaseⅤ gasoline is produced.The successful experience in the production lays a firm foundation for the next step using RSDS-Ⅲtechnology.