Adsorptive Desulfurization of Propylmercaptan and Dimethyl Sulfide by CuBr_2 Modified Bentonite

Adsorptive desulfurization for removing propylmercaptan （PM） and dimethyl sulfide （DMS） over CuBr2 modi- fied bentonite was investigated under ambient conditions in this work. A saturated sulfur capacity as high as 196 mg of S per gram of adsorbent was demonstrated. The influence of loading amount of Cu （II） and calcination temperature on adsorptive desulfurization was investigated. Test results revealed that the optimum loading amount of Cu （II） was 15%, and the calcination temperature was 150 ℃. The pyridine-FTIR spectroscopy showed that a certain amount of Lewis acid could contribute to the increase of adsorption capacity. Spectral shifts of the v（C-S） and v（Cu-S） vibrations were detected from the Raman spectra of the Cu （II） complex which was a reaction product of CuBr2 with DMS. According to the hybrid orbital theory and the complex adsorption reaction, the desulfurization of PM and DMS over the CuBr2 modified bentonite is ascribed to the formation of S-M （σ） bonds.

铜离子交换的13X分子筛脱除硫醇的特性研究

采用离子交换法制备了一系列铜离子改性的13X分子筛吸附剂,在一定温度下焙烧后,在静态反应装置和动态工业模拟装置上考察吸附剂对硫醇的吸附效果。实验结果表明:在Cu2+浓度为0.2 mol/L,焙烧温度为500℃,吸附温度20℃的条件下,改性的13X分子筛的硫容达到16.18%。吸附剂的最佳再生温度为300℃,硫容能恢复到原来的78.2%。采用红外光谱法(IR)和比表面积测定法(BET)对吸附剂的脱硫机理进行了研究。红外分析表明,Cu2+和丙硫醇分子以π键形式结合;BET研究表明,通过Cu2+离子交换后吸附剂的孔径和孔容都有所增加。