Abstract
AbstractRadicals formed in the low pressure pyrolysis of hydrocarbons can be quantitatively analyzed by scavenging them with dimethyl disulfide (DMDS) in the condensed phase, the pyrolyses of several hydrocarbons (ethyne, ethene, 1.3‐butadiene, and benzene) have been studied in a flow reactor at 1300 K and 10.7 mbar. Samples of the hot gas mixture leaving the reactor were taken continuously by a quartz probe, the resulting supersonic nozzle beam was frozen together with an excess of DMDS on the inner surface of two hollow hemispheres cooled by liquid nitrogen. While melting the scavenging reaction takes place. The mixture of DMDS, stable pyrolysis products, and methylthio compounds was separated and identified with a GC‐MS‐system. CH*3, C2H*3, C6H*5 radicals and H‐atoms have been detected. The presence of acetone in ethyne pyrolysis has an important influence on the radical concentrations and the product yields.
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