Integrated process of direct coal liquefaction and its residues pyrolysis
Zhu Yu-fe · Meitan xuebao · 2013
Because of the high residues yield and short of solvent oil in direct coal liquefaction,a solution to solve the problem was found by researching and developing the integrated process of direct coal liquefaction and its residues pyrolysis.The reaction rules of Shenhua direct coal liquefaction residues pyrolysis were studied with bench-scale-units.The products distribution and their properties under typical process conditions were obtained.And the relationship between aromatic-carbon-ratio of hydrotreated tar and hydrotreating process conditions were studied.The hydrotreated tar,aromatic-carbon-ratio in the range of 0.40-0.45,can be produced at appropriate hydrotreating process conditions.The result shows that the hydrogenated tar can be used as hydrogen donor solvent oil for direct coal liquefaction process.So the integrated process of direct coal liquefaction and its residues pyrolysis is feasible based on technics.Comparing to direct coal liquefaction process,integrated process yields 5.8%(based on coal) more liquid product and produces 4%(based on coal) extra solvent oil for direct coal liquefaction process.