| The Yellow Phosphorus making process discharges mass tail-gas. The major 85 to 95 percent component of the tail-gas is Carbon Monoxide, and the other components contain Phosphorus(P), Sulphur(S), Fluorine(F), Arsenic(As), CarbonDioxide(CO2), Hydrogen gas(H2), Nitrogen(N2) and Marsh gas(CH4). The high quality Carbon Monoxied in the tail-gas can be used to make fuel and carbon chemical materials, such as Formic Acid(CH2O2), Oxalic Acid(C2H2O4), Phenylacetic acid(C8H8O2), Amide, Dimethyl Carbonate(C3H6O3), Carbinol and Phosgene. However, in all of the components the existence of the elements of the Phosphorus(P) and the Sulphur(S) brings negative effects to the further production of the chemicals. In order to remove the impurities of the Hydrogen sulfide(H2S) and the hydrogen phosphide (PH3), this project is to research how to use catalysts to oxygenize the Hydrogen sulfide(H2S) and the hydrogen phosphide (PH3). To achieve this aim, the main research objectives of this project are as follows:To choose the catalyst carrier.To confirm the preparation method of the catalyst.To choose a kind of the maceration extract and confirm its density for maceration of the catalyst.To produce the catalyst.To analyze the factors which influence the oxygenization of the Hydrogen sulfide(H2S) and the hydrogen phosphide (PH3).To analyze the adsorption equilibrium of the catalyst in the process of the oxygenization of the Hydrogen sulfide(H2S) and the hydrogen phosphide(PH3).To research the heat of adsorption of the catalyst in the process of the oxygenization of the Hydrogen sulfide(H2S) and the hydrogen phosphide (PH3).To research the process of the oxygenization of the Hydrogen sulfide(H2S) andthe hydrogen phosphide (PH3) with the principles of dynamics. After lots of chemical experimental reactions this project finds the following answers: (1). Compared with other carriers in the market, such as activated charcoal and activated aluminum oxide, Industrial Activated Charcoal has not only high adsorptive capacity but also good adsorptive effects and low price. It is finally chosen the industrial activated charcoal to do as the carrier of the catalyst. (2). Maceration method is to used to make the catalyst. The maceration extract of the dephosphorizing catalyst is 5% HC1 and the maceration extract of the desulfurating catalyst is 7% NaCO3. (3). Temperature is a major parameter to determine the oxygenization action of the adsorbent. Low temperature impels the physical adsorption and high temperature is good for the chemical adsorption. Both the physical adsorption and the chemical adsorption are existed in the process of adsorption. (4). With the increase of the temperature the influence of the physical adsorption is becoming weak, but the influence of the chemical adsorption is becoming obvious. Since the physical adsorption is a kind of exothermic reaction compared to the chemical adsorption, a kind of endothermic reaction, catalytic oxidizing reaction has a best action temperature in which the action has the biggest adsorptive capacity. (5). In the process of catalytic oxidizing reaction for the Hydrogen sulfide (H2S), with the increase of airspeed in the fix quantify of the catalyst adsorptive capacity of the catalyst is decreasing. (6). In the process of catalytic oxidizing reaction for the Hydrogen sulfide (H2S), the quantity of oxygen has positive effects to the adsorptive capacity. But when the quantity of oxygen reaches to a high point, the effects will be very weak. (7). Experimental adsorption equilibrium of the Hydrogen sulfide (H2S) data fit with the Freundlich Equation. Between 20 C and 70C, the adsorption process is controlled by the physical adsorption. Adsorptive capacity is decreasing with the increase of the temperature. Above the 70 C, the chemical adsorption dominates the action. High temperature, high adsorptive ability. (8). At the three different temperature of 20 degree, 50 degree and 70 degree C the following adsorptive capacities for the Hydrogen sulfide(H2S),... |
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