Study On The Adsorption Of Sulfide In The Oils

The existence of sulfide in the oils will affect the quality of the oils and can easily make environmental contamination, so it is important to remove the sulfide. Using new technology and materials is the core task in this field. Activated clay is porous, so it has the excellent adsorption ability, meanwhile, clay is relatively inexpensive, so it is comparatively economic. The research in using activated clay as adsorbent and optimizing the desulfurization technology has the significant development potential.In this paper, original and modified Ezhou clay, Linan clay and Yixian clay were prepared to study the desulfurization capacity by using dynamic tests and static tests. The result showed that Ezhou original clay had the best desulfurization capacity for having the largest pore volume and BET surface area; all the modified clays had improved their sulfur capacities. In the removing of mercaptan,15wt.% CuCl2 modified Ezhou clay with the calcining temperature of 150℃reached the sulfur capacity of 41%,60wt.% KMnO4 modified Ezhou clay with the calcining temperature of 150℃reached the sulfur capacity of 56.4%, and adding MgO suitably could improve the sulfur capacity again. It was also shown that the sulfur capacity of CuCl modified adsorbent was better than CuCl2 modified adsorbent, TGA curves presented the oxidation process of CuCl2 with the increasing of calcining temperature, XRD showed that the copper compounds on the clay exist as amorphous materials, the FT-IR analyses showed that increasing the amount of the weak L acid sites contributed to the increase in the activity of the adsorbent, solubility tests presented that the desulfurization capability was better when there was more soluble copper on the surface of the adsorbent, and BET test showed that CuCl modified adsorbent had the larger pore volume and BET surface area than CuCl2 modified adsorbent. In the removing of thiophene,7wt.% AgNO3 modified Ezhou clay with the calcining temperature of 150℃reached the sulfur capacity of 4.3%.