Method for preparing mesophase pitches or mesophase microspheres through coal and oil co-liquified residues

Abstract

The invention provides a method for preparing mesophase pitches or mesophase microspheres through coal and oil co-liquified residues. The coal and oil co-liquified residues and a first-level extracting solvent are subjected to positive extraction, first-level extract liquor and first-level raffinate are obtained, remaining substances obtained after the first-level extracting liquid solvent is recycled are a mixture of asphaltene and heavy oil, the mixture of the asphaltene and the heavy oil and a second-level extracting solvent are subjected to position extraction, and second-level extract liquor and second-level raffinate are obtained; the second-level raffinate is processed, and asphaltene is obtained; heavy oil is obtained after the second-level extracting liquid solvent is recycled; the asphaltene and the heavy oil are mixed according to a certain proportion and evenly placed in a reactor to be subjected to co-carbonization thermal polycondensation, and thermal polycondensation products containing the mesophase pitches or thermal polycondensation products containing the mesophase microspheres are generated; the thermal polycondensation products containing the mesophase microspheres are washed through quinoline, filtered and dried, and the mesophase microspheres are obtained. The method has the advantages of being simple in technology and low in production cost.

Description

technical field [0001] The invention belongs to a method for preparing mesophase pitch or mesocarbon microspheres, in particular to a method for preparing mesophase pitch or mesocarbon microspheres with kerosene co-liquefaction residue. Background technique [0002] Co-liquefaction of kerosene is the most promising way to convert coal and vacuum or atmospheric cracking residue or other heavy oil (including catalytic cracking oil slurry, oil sand pitch, coal tar, etc.) into clean liquid fuels in the petroleum industry. route. The kerosene co-liquefaction technology is developed on the basis of the direct coal liquefaction technology. It can improve or even eliminate the defects of the direct coal liquefaction technology. The advantages of low consumption, low investment and high conversion rate. Co-liquefaction of kerosene produces a considerable amount of heavy products (ie, liquefaction residue) while obtaining light oil products and a small amount of gas. At present, th...

AI Technical Summary

Problems solved by technology

Both of these two methods need to add chemical additives or polycondensation solvents and nucleation accelerators to the bituminous substances in the coal liquefaction residue. solvents, these methods do not fully reflect the utilization of heavy oil

[0005] In the prior art, mesophase pitch is mainly prepared by using components such as asphaltene, pre-asphaltenes or asphaltenes in the liquefaction residue. The orientation of the generated mesophase is not very ideal, and the obtained mesophase generally has a wide-area structure, and the softening point Slightly high, the rheological properties after melting are not very good, and the spinnability is not good

When using heavy oil to prepare mesophase, the obtained mesophase is generally mesophase carbon microspheres and mosaic structure, the spheres do not melt and grow into a streamlined structure, and the sphericity of the spheres is not very good