The Study Of Methane Pyrolysis To Acetylene In Arc Plasma

It is well known that acetylene is an important organic chemical material, its traditional process is using CaC₂ as raw material, which will led to serious pollution and higher energy consumption. So it is very important to explore a new technical means to produce acetylene.The way of methane pyrolysis in arc plasma had many advantages, such as simple technological process, less pollution, continuous preparation and easy magnification etc. So it is considered as a new method that may instead of the traditional craft, and many researcher had done many work in theory and experimental at home and abroad. But some problem during the process limit its industrialization, such as how to restrict and eliminate the coke, uniformity of raw material, how to minimize the steep radical temperature gradients and ameliorate the quenching of products effectiveness. In order to improve such questions, and integrate the condition of lab, the paper did the experimental of methane plasma pyrolysis and analyzed the C-H equilibrium system, which will provide effective path to conversion of methane.The paper makes an analysis of C-H homogeneous equilibrium system and C-H heterogeneous equilibrium system during the methane pyrolysis using the Gibbs minimization free energy method above the prior researcher's work.The influences of quenching, flow ration of methane and structure of reactor to acetylene has been analyzed. The dada suggested that the main hydrocarbon gas were C₂H₂, C₂H₄ and C₃ and some solid product. The conversion efficiencies of methane approached 100%, the highest acetylene concentration was 12.57%, and the yield of acetylene was more than 95%, the minimum specific energy requirement of acetylene is 9.67 kWh/kg-C₂H₂. Compared with other researcher's result, we have made a higher concentration and yield of acetylene, which may due to the improvement of reactor configuration and quenching. The concentration and yield increase 21% and 16% individually after quenching. The structure of and the residence time of products in the plasma have a prominent influence of acetylene.