Abstract: The kinetics and mechanism of the thermolysis for five model compounds were studied in tetralin under N_2 pressure about 50-60 atm. The results show that:
(1) Diphenyl methane and diphenyl ether are stable under 435 ℃ for 2 hours reaction, which implies that the cracking of C—C and C—O bounds in coal liquefaction is not similiar to one of these compounds.
(2) The reaction of thermolysis of dibenzyl and phenyl benzyl ether are first Order and can he explained by free radical mechanism. Experimental rate constants are well consistent with the results of thermochemical kinetics calculation.
(3) The thermolysis of dibenzyl ether is well explained by te intramolecular hydrogen transfer model. Benzyl aldehyde produced by reaction is further deoxygenated. This is probably a very important deoxygenation process in coal liquefaction.