工艺条件对乙炔环三聚制苯催化剂性能的影响

Effects of process conditions on catalyst performance for acetylene cyclotrimerization to benzene

研究钯催化体系在不同温度、压力、时间下对乙炔环三聚制苯反应的影响,提出催化反应机理。结果表明,以(Ph_3P)_2PdCl_2/CuCl为催化体系,N-甲基吡咯烷酮为溶剂,在反应压力2.5 MPa、反应温度140℃、反应时间2 h条件下,乙炔转化率99.8%,苯收率26.3%,副产物主要是聚乙炔、乙炔铜和少量芳香族化合物。此催化体系具有反应条件温和、反应进料组分简单、成本低等优点。

Acetylene cyclotrimerization were investigated at different temperature, pressure and reaction time with different palladium catalytic systems. Reaction mechanism was proposed. The results showed that yield of benzene could reach 26.3% and conversion of acetylene was 99.8% under 2.5 MPa at 150 ℃ for 2 h, while catalyst were （Ph3P）2PdCl2/CuCl and N- methyl pyrrolidone used as solvent. By- prod- ucts were polyacetylene, copper acetylide and few aromatic compounds. The catalytic system had advanta- ges of mild reaction conditions, simple reaction feed composition and low cost.