Studies On The Hydrodesulfurization Reaction Kinetics Of Methanol Synthesis Gas And Simulation Of The Industrial Reactor

Methanol produced by the coke oven gas is one of the important andprofitable wayes to use the coal resources, saving energy and reducingemission. The content of sulfur in the syn-gas should not be higher than0.1ppm since the catalyst for producing methanol is very sensitive to sulfur. As aresult, the deep desulfurization of the coke oven gas is a key part in theprocess of methanol synthesis from coke oven gas. The kinetic modelsconcerning the deep hydrodesulfurization of the coke oven gas and thesimulations of reactor were rarely reported though this technology has beenindustrialized for many years. This article is focused on the kinetics of thehydrogenation of olefins and the hydrodesulfurization of sulfur compounds inthe coke oven gas as well as the reactor simulation of the first stage reactor.The composition of the coke oven gas is very complicated and it isdifficult to determine the contents of it. First of all, a proper analytical method was established. The sulfides were determined by gas chromatography. Theconcentration of H2, CO, CO2, N2, O2and hydrocarbons could be acquired byinter-correlation of the results obtained from three GC columns via methane.First, internal and external diffusion examinations have been studied. Theranges of the experiments have been determined with the industrial produceconditions considered. Experimental data was obtained by usingcomprehensive experimental methods. There were quite a few uniquephenomenon concerning the experiment, such as the conversion of CS2approaching100%in moderate conditions, the nearly constant conversion ofCOS in all the experimental range, the numerous unsaturated hydrocarbonswhich were sources of C4H4S and the difficulties encountered in thequantitative and qualitative analysis of materials and products. Due to this fact,a number of reasonable assumptions were made and the kinetic parameterswere calculated. The kinetic equations for C2H4, H2S, C2H5SH and C4H4Swere finally obtained. After a strict statistical analysis, the authenticity of thisreaction model was proved. A primary possible explanation for the uniquephenomenon mentioned above was given but needs further tests.Based on the kinetic model of the coke oven gas and data from industrialplants and with relevant knowledge of reactor simulation, the industrial reactorwas simulated with a one-dimesion pseudo–homogeneous model. Thesimulated results are consistent with observations of the industrial reactor.