Patent ID: 9193921
Filing Date: 2015-11-24
Classification: C07C,C10G

Abstract:
1. A process comprising: pyrolyzing coal to produce a coal tar stream; fractionating said coal tar stream to provide at least one hydrocarbon stream comprising polycyclic aromatics; hydrotreating the hydrocarbon stream in a hydrotreating zone in the presence of a catalyst containing at least one group VIII metal and at least one group VI metal to remove sulfur, nitrogen, and metals and to saturate hydrocarbon with double or triple bonds to produce a hydrotreated stream; hydrocracking the hydrotreated stream in the presence of catalyst comprising amorphous silica-alumina bases or low-level zeolite bases combined with one or more group VIII or group VIB metal hydrogenating metal in a hydrocracking zone to crack a first portion of the polycyclic aromatics to mono-aromatics and saturate mono-aromatics to cycloparaffin; and hydrogenating a second portion of the polycyclic aromatics in the hydrocracking zone to form a hydrogen donor molecules including tetralin, naphthene, and paraffins; introducing a light fraction (C5−) output from the hydrocracking zone to an olefin production zone; producing olefins in the light fraction output by steam cracking, wherein excess hydrogen is produced; introducing the excess hydrogen to a hydroprocessing zone; and recycling a first portion of hydrogen donor molecule stream to one of the pyrolyzing steps and/or the hydrotreating step.