THERMAL REACTIONS OF CYCLIC ETHERS AT HIGH TEMPERATURES. 3. PYROLYSIS OF FURAN BEHIND REFLECTED SHOCKS

Article abstract of DOI:10.1021/j100412a096

The thermal decomposition of furan was studied behind reflected shocks in a single shock tube, over the temperature range 1050-1460 K, at total gas densities of approximately 3 x 1E-5 mol/cm³.Methylacetylene and carbon monoxide are the major reaction products and are formed by the reaction furan -> CH3<*>CH + CO (1), with a rate constant k₁ = 1E15.25+/-0.5exp<-(77.5+/-2.5) x 1E3/RT>s^-1.A second initiation reaction produces acetylene and ketene according to the reaction furan -> CH3<*>CH + CH2=CO (2), with a rate constant k₂ = 1E14.7+/-0.5exp<-(77.5+/-2.5) x 1E3/RT>s^-1.The rate constant obtained for the overall decomposition of of furan in the temperature range 1060-1260 K is k_total = 1E15.43+/-0.45exp<-(78.3+/-2.0) x 1E3/RT>s^-1.The overall pyrolysis rate measured in this investigation is about 8 times lower than the extrapolated from an estimated value suggested for the low-pressure pyrolysis.Additional reaction products which appear in the pyrolysis are CH2=C=CH2, C4H6, C2H4, CH4, C4H4, C4H2, and C6H6.They appear in noticable quantities at high temperatures and are probably secondary products.