Abstract
Hydrocracking of a petroleum vacuum distillate was carried out under a pressure of 15 MPa and temperatures of 390, 410, and 420°C on a NiW/aluminosilicate catalyst. Both the vacuum distillate and the high-boiling products of its hydrocracking were subjected to pyrolysis to yield light alkenes. The pyrolysis feedstocks were analysed by a procedure consisting in separation by liquid adsorption chromatography and subsequent characterization by elemental analysis, vapour pressure osmometry, 1H and 13C n.m.r. spectrometry, and mass spectrometry. The relation between chemical structure and composition of the materials used for pyrolysis on the one hand and the yield of light alkenes on the other hand is discussed.
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