催化裂化轻汽油萃取蒸馏脱硫实验研究

采用萃取蒸馏法对FCC轻汽油进行脱硫实验，对脱硫溶剂和脱硫工艺条件进行评选。结果表明：最佳脱硫溶剂为TSJ，在蒸馏级数为2、剂油体积比为0.4、FCC轻汽油进料空速为1.5 h-1的条件下，FCC轻汽油A的硫质量分数从114 μg/g降至48.2 μg/g，脱硫率为57.72%， 收率为99.20%，达到国Ⅳ排放标准（汽油硫质量分数不大于50 μg/g）；用N2对TSJ富液再生、脱硫循环5次后，FCC轻汽油A的脱硫率基本保持不变。TSJ对原料的适应性良好，对多种FCC轻汽油进行萃取蒸馏脱硫实验，都可得到较高的脱硫率和收率。

STUDY ON DESULFURIZATION OF FCC LIGHT GASOLINE

Desulfurization tests of FCC light gasoline by extractive distillation were carried out. Optimum desulfurization solvent and the process conditions were selected. Results show that self-made TSJ is the optimum desulfurization solvent. Under the conditions of 2-stages distillation, a TSJ/FCC light gasoline volume ratio of 0.4 and a FCC light gasoline space velocity of 1.5h-1, the sulfur content of treated FCC light gasoline A is dropped from 114μg/g to 48.2μg/g, the desulfurization rate is 57.72% and the yield reaches 99.20%, meeting the sulfur content of National Ⅳ emission standard for gasoline（≯50μg/g）. The sulfur–rich solvent TSJ can be regenerated by N2 tripping. After 5 times of regeneration and desulfurization, the desulfurization rate of FCC light gasoline A is nearly unchanged. Desulfurization of several FCC light gasolines by extractive distillation using TSJ was investigated and high desulfurization rate and high yield can be obtained.