改性分子筛吸附脱除液态烃中的二甲基二硫醚

Adsorption Removal Dimethyl Disulfide in Liquid Hydrocarbon by Modified Molecular Sieve

采用浸渍法制备改性分子筛,并用XRD、BET技术对其结构进行表征。采用间歇静态吸附法和连续动态吸附法考察吸附剂在模拟液态烃中对二甲基二硫醚的脱除性能。结果表明:4A分子筛复载金属离子后脱硫效果顺序为4A<Cu4A<Co4A<Ag4A<Ag Co4A,复配型Ag Co4A分子筛吸附剂在相同条件下脱硫效果最佳。当Ag+离子交换浓度为0.1 mol/L时制备的复配型Ag Co4A分子筛具有最好的脱硫性能,在间歇静态脱硫实验中剂油比为0.02g/ml、吸附时间为1h即可达到吸附平衡,其饱和吸附硫容为3.76mg S/g,脱硫率高达95.74%;连续动态吸附实验中液态烃空速为0.5h-1时可达到最佳吸附状态,脱硫率高达97.95%,饱和吸附硫容为5.71mg S/g。吸附剂具有良好的稳定性和再生性,再生后的静态吸附脱硫率可达93.95%。

we first made preparation of modified molecular sieve by the impregnation method. And then composition and specific surface area of the adsorbents were determined by XRD and BET technique. The method of intermittent static adsorption and continuous dynamic adsorption were used for investigating the desulfurization performance of the adsorbents in liquid hydrocarbon. The results show that the order of desulfurization performance of modified 4A molecular sieve was 4A〈Cu4A〈Co4A〈Ag4A〈AgCo4A; The AgCo4A zeolite has better desulfurization performance than Co4A and Ag4A zeolites which is better than the unmodified 4A zeolite in the same condition. The desulfurization rate with the method of intermittent static adsorption can reach 95.74% ,and the saturation point of the sulfur capacity is 3.76mgS/g when Co4A is modified under the following conditions：0.1 molFL of AgNO3, 1 hour of intermittent static adsorption desulfurization time and 0.02g/ml of the ratio of solid and fuel. The desulfurization rate with the method of continuous dynamic adsorption can reach 97.95% when the liquid space velocity is 0.5h-1, the sulfur capacity is 5.71mgS/g in the same condition. The absorbent has good adsorption reproducibility and stability. The static desulfurization rate of regenerated adsorbent is 93.95%.