Study On The Catalytic Synthesis Of Ethylene Process Of Acetylene On Fixed-bed

Vinyl chloride is a kind of important chemical raw materials. In industrial production, there are two main methods for synthesizing vinyl chloride, which are hydrochlorination of acetylene and oxychlorination of ethylene. In our country, most manufacturers use hydrochlorination of acetylene to product vinyl chloride, which is determined by Chinese special energy structure. But, in this process, poisonous HgCl2 has been used as active ingredients of catalyst. Mercury which sublimate easily causes serious damage to the environment. How to reduce or even eliminate mercury pollution in hydrochlorination of acetylene process is a problem needs to be solved.In this paper, activated carbon from coconut shell was taken as the supporters, the low-mercury catalysts and non-mercury catalysts of hydrochlorination of acetylene were prepared by dipping. And the catalysts activities were tested in a fixed-bed reactor, the reaction optimization of process conditions were obtained, established the kinetics equation of hydrochlorination of acetylene on non-mercury catalyst. The conclusions are as follows:(1) Based on the results of thermodynamic calculation of the reaction of hydrochlorination acetylene, and the investigation of the effect of reaction temperature, operating airspeed and molar ratio of raw materials, this paper optimized the reaction conditions: the reaction temperature was 453 K, the molar ratio of raw materials(HCl : C2H2) was 1.075, the operating airspeed was 30 h-1; the optimized reaction conditions for non-mercury catalyst : the reaction temperature was 433 K, the molar ratio of raw materials(HCl : C2H2) was 1.08, the operating airspeed was 60 h-1.(2) Kinetic model of the hydrochlorination of acetylene based on the non-mercury was studied in a fixed-bed reactor. After the internal and external diffusion were eliminated, the kinetics equation was derived based on the Langmuir adsorption model. Calculated the activation energy for the reaction, the result was 85.36 kJ·mol-1.The kinetics equation of hydrochlorination of acetylene on non-mercury catalyst were:When the temperature ranges from 383 K to 473 K, the constants of reaction rate were:...