Aspen Simulation of Rectification and Purification Process of Methyl Chloride
Aiming at the production of methyl chloride mixture from liquid alkali of phosphorus trichloride by two-step method,combined with the physical characteristics and separation requirements of each component,the purification process of methyl chloride by negative pressure double tower distillation was established,and the process simulation was completed by Aspen software.Taking the theoretical plate number,feed position,reflux ratio and tower top yield as independent variables,and the mass flow of methyl dichloride at the bottom of the light-removing tower and the mass fraction of components at the top of the heavy-removing tower as dependent variables,the sensitivity analysis of the light component removing tower and the heavy component removing tower was completed,and the process design and operation parameters were optimized.The optimized distillation process could achieve the purification requirements,the mass fractions of methyl chloride,trimethyl thiosulfate,methyl dichloride in purified product were 99.04%,0.67%and 0.29%,respectively.The yield of methyl chloride reached 97%.
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