催化裂化汽油萃取蒸馏脱硫的研究

以140℃为切割点,对催化裂化汽油进行切割。切割后轻组分和重组分的硫含量分别为234μg/g,903μg/g。以二甲基甲酰胺为萃取剂,轻组分为原料,通过单因素实验优化了萃取蒸馏脱硫工艺条件。结果表明,最佳工艺条件为:总塔板数17块,萃取剂进料位置第六块塔板,汽油进料位置第十一块塔板,回流比1,萃取剂/原料油(质量比)1,塔顶温度控制在60℃左右。在此条件下,精制油硫含量为48μg/g,收率为60.8%,硫含量满足欧Ⅳ汽油排放标准。

Desulfurization of fluid catalytic cracking gasoline by extractive distillation

Fluidized -bed catalytic cracking （FCC） gasoline was distillated into light and heavy fractions at the cut point 140 ℃ in a distillation column. Sulfur contents in light and heavy cuts were 234 μg/g and 903 μg/g, respectively. The light fraction was desulfurized by extractive distillation using dimethyl formamide as solvent. The results showed that the optimum desulfurization condition was：plate number 17, solvent feeding at 6th plate,gasoline feeding at 11 th plate,reflux ratio 1 and solvent to gasoline volume ratio 1. Under this condition, distillation yield reached 60.8%, and sulfur content of the product was 48 μg/g, which could meet Europe Ⅳ standard.