选择性加氢及醚化工艺处理催化汽油的应用

Application of selective hydrogenation and etherification process for processing FCC naphtha

介绍了采用美国Lummus公司的深度脱硫及醚化(SHU/CDHDS+/CDEthers)专利技术的基本工艺过程及生产操作情况。该工艺以催化汽油为原料,先进行选择性加氢、二烯烃饱和、硫醇醚化,然后对加氢产物进行轻、重汽油的切割。轻汽油经洗涤后与甲醇一起进行醚化反应,得到低硫醚化汽油;重汽油进入下游CDHDS+单元进一步脱硫,得到低硫重质汽油调合组分,满足生产清洁汽油的需要。生产实践表明,装置生产运行情况良好,各项操作参数比较平稳。装置经选择性加氢并实现轻、重汽油分割,得到的低硫醚化汽油组分硫质量分数为25μg/g,通过醚化过程,能够明显增加生产效益;重汽油在加氢脱硫过程仍能保持较高的辛烷值(RON为88),硫质量分数低至2μg/g。

SHU / CDHDS ＋ / CDEthers process of Lummus Company and its commercial operation are introduced. The process is applied to process FCC naphtha by selective hydrogenation of naphtha,diolefins saturation and mercaptan etherification. The hydrotreated product is separated into naphtha gasoline and heavy naphtha. After washing,the light naphtha goes with methanol into the etherification reactor to produce etherified naphtha. Heavy naphtha is further desulfurized in CDHDS ＋ unit to get low-sulfur heavy gasoline blending component for the production of clean gasoline. The production practice shows that,after selective hydrogenation,the unit is operating satisfactorily and stably. After selective hydrotreating and separation of light naphtha and heavy naphtha,the sulfur in the etherized gasoline is only 25 ppm. The economic benefit can be obviously improved. The octane number of heavy naphtha remains at RON 88 after desulfurization,and sulfur content is reduced to 2 ppm.