Proceeding of ethylene and propylene from natural gas via the intermediate synthesis of methyl choride and its subsequent catalytic pyrolysis

There is study of the original two-step producing process of ethylene and propylene from natural gas by catalytic pyrolysis of methyl chloride produced by oxidative chlorination of methane. There are study of the kinetics of methyl chloride catalytic pyrolysis on the silico-alumino-phosphate catalyst SAPO-34, and determination the parameters of the process, providing 70 % conversion of methyl chloride and selectivity of ethylene – 45 %, propylene – 35 %. Kinetics of the oxidative chlorination of methane on the catalyst which represents mixture of copper chloride, potassium, and lanthanum deposited on a support was studied. Based on the results of kinetic studies in this paper, the authors tested the process of oxidative chlorination of methane in the pilot plant in reactors of different types – a fluidized bed reactor (diameter – 400 and 45 mm), tubular (diameter – 27 mm) and a pilot plant in two-stage adiabatic reactor (diameter – 800 mm). The process of checking with the supply of oxygen distributed to each stage at a temperature of 300–320 °С inlet and a 400–420 °С at the outlet of the catalyst bed. The selectivity of formation of methyl chloride in the amount chloromethanes equal to 90%. Schematic diagram of a balanced chlorine process of producing ethylene and propylene from natural gas was developed, the conditions of the reactions of oxy-chlorination of methane and methyl chloride in the pyrolysis of industrial reactors are determined. The implementation process will be primarily at plants in need of increasing the output of ethylene to vinyl chloride deficit and have experience working with hydrochloric acid and chlorinated hydrocarbons.

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