Pyrolysis of vinylacetylene between 300 and 450°C

摘要: Vinylacetylene was pyrolyzed at 300–450°C in a packed and an unpacked static reactor with pinhole bleed to quadrupole mass spectrometer. The reactant C8H8 products were monitored continuously during reaction by spectrometry. In some runs, the also analyzed gas chromatography after run. these runs CH4, C2H6, C3H6, C2H4 detected. The for vinylacetylene removal formation is homogeneous, second order reactant, independent of presence large excess N2 or He. However, about half-suppressed addition free-radical scavengers NO O2. rate coefficient total 1.7 × 106 exp(−79 ± 13 kJ/mol RT) L/mol · s. major C4H4 polymerization. four isomers, carbon, small hydrocarbons are formed. three isomers styrene, cyclooctatetraene (COT), 1,5dihydropentalene (DHP). The compounds formed both molecular processes second-order process overall k ≃ 3 108 exp(−122 s (average cell results). occurs = 8.5 107 exp (−118 COT, DHP, unidentified isomer (d), exclusively respective coefficients 4.4 104 exp(−77 RT), 105 exp(−89 3.1 109 exp(− 148 styrene direct isomerization COT.