Processing of methyl chloride waste in the production of olefins from natural gas

The process of gas-phase (200–400 °С) catalytic hydrodechlorination (GDH), the main components of wastes (CH2Cl2, CH3Cl, CCl4) of methyl chloride production from methane was studied. The process is intended for waste recovery in developed technology for «light» olefins production from methane by pyrolysis of methyl chloride. The study was conducted at the laboratory unit on the industrial catalysts for hydrogenation and hydrotreating. Three catalytic systems and conditions for stable flow of GDH are identified. The main products of the process are CH4, CH3Cl, light olefins, and HCl. Concentration of CH3Cl and olefins increases in products using a catalyst Ni–Mo/Al2O3. All products of GDH process can be used in the technological scheme of olefins production, which is to create wasteless and chlorine balanced production of olefins from natural gas (methane). Implementing of olefins production technology is not possible without GDH stage because of significant waste.

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