Study On The Attapulgite For The Removal Of The H₂S And The Decolorization Of Oil

With the deepening of the sustainable development of "green chemistry" concept, The use of a safe, environmentally friendly green adsorbent become one of the important research of green chemistry. Attapulgite with its features and characteristics used to develop some new adsorbent has good prospects. In this topics, attapulgite as the main raw material, attapulgite desulfurizers loading iron oxide nanoparticles, doped Ni nano manganese dioxide and ionic liquid and distillate attapulgite bleaching agent and tires Oil attapulgite bleaching agent were prepared. And experimental studies of hydrogen sulfide removal and oil discoloring were carried. The results were as follows:(1) Attapulgite as the carrier, starch glycoside nonionic surfactant as dispersants, nano-iron as the active ingredient, desulfurizers was prepared. Using L18(2x73) orthogonal test and single-factor test, the pure H2S gas flow rate of lOmL/min, desulfurization agents that were prepared under different conditions were used to remove H2S gas. The maximum removal capacity of H2S was29.98%. Desulfurization mechanism of desulfurizers before and after desulfurization were analyzed by IR, XRD, TEM and XPS. H2S adsorbed by attapulgite reacted with iron oxide nanoparticles, and produced black FeS, S and water. During the reaction, Fe2O3on the one hand as a catalyst to accelerate the decomposition of H2S, on the other hand as the oxidizing agent to react with H2S. FeS generated will be oxidized by oxygen in air to generate the red-brown iron oxide and S. So oxygen in the air have regenerative action to the desulfurizer.(2) Attapulgite as the carrier, nano manganese dioxide was prepared using the chemical solution deposition method, and Ni was doped to be load on Attapulgite desulfurizer togather. Using L9(43) orthogonal test, desulfurization agents that were prepared under different conditions were used to remove H2S gas. The maximum removal capacity of H2S was16.24%. Experimental data, IR and XRD analysis show that①Ni doping, desulfurization reaction becomes slower, the reaction does not produce secondary pollutants SO2, and produces a white product MnS04. H2S is fixed down in way of S and SO42-respectively. Ni can avoid secondary pollution.②non-ionic surfactants can inhibit desulfurization performance of Ni-doped nano-MnO2attapulgite desulfurizer, which can result in lowering the sulfur content.(3) Attapulgite as the carrier, brominated butyl pyridine was prepared to load on attapulgite to obtain defulfurizer using impregnation method. Using L9(43) orthogonal experiment, the optimum preparing conditions for brominated butyl pyridine Attapulgite desulfurizer is that ionic liquids to attapulgite ratio1:3, stirring time60min, standing time60min, drying temperature100℃. the maximum removal capacity of H2S was5.7%.(4) A variety of attapulgite and activated clay bleaching comparative study show that decolorization rate of Xuyi attapulgite bleaching agent activated at100℃is best,75.48%. By orthogonal test and single factor experiment about activation temperature of Xuyi attapulgite, when the activation temperature was300℃, the maximum decolorization rate reached77.42percent. Infrared analysis show that the attapulgite absorbed sulfur compounds and unsaturated hydrocarbons easily to make the gasoline color deepen.(5) Attapulgite as bleaching agents, combined acid purification and distillation, using two sets of Lg(43) orthogonal experiment, the absorbance as orthogonal test evaluation, the bleaching of tire pyrolysis fuel oil was studied. The maximum bleaching rate is84.85%. Bleaching oil density, flash point and viscosity performance indicators was detected. The attapulgite bleaching agent was characterized by FT-IR, XRD, TEM, BET and other techniques.