[Effect of overheating products of wood hydrolysis on 3,4-benzpyrene output].

Under study was the effect of overheating of wood pyrolysis products at 600 degrees C on the content of 3,4-benzpyrene in them. Overheating only of the water portion of pyrolysis products would increase considerably its BP content, on account of it the total output of the carcinogen is increased. While overheating of total pyrolysis products results in still greater increase of total BP output on account of its concentration rise both in the water portion and resin.

[Differences in the mechanisms of low-temperature and high-temperature processes in the formation of 3,4-benzopyrene during wood pyrolysis].

In 4 series of experiments a dependence between 3,4-benzpyrene (BP) output and the temperature of fir sawdust pyrolysis under isothermic conditions has been investigated. The experimental series differed in the duration of wood pulp particles stay in the reaction zone (tau). Also EPR spectra of pyrolysis products have been recorded.