Preparation method of polycondensed asphalt, preparation method of needle coke and needle coke
A pitch and polycondensation technology, applied in the field of needle coke, can solve the problem of a single source of needle coke raw materials, and achieve the effects of improving overall economic benefits, high carbon content and high aromaticity
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[0031] In order to solve the problems of single raw material source and high CTE mentioned in the background art for preparing needle coke, in a typical embodiment of the present invention, a preparation method of polycondensation pitch is provided, and the preparation method adopts coal The liquefaction residue is used as the raw material, and by adjusting the extraction solvent, the quinoline insolubles are separated, and the polycyclic condensed aromatic hydrocarbons are retained to obtain the pitch raw material suitable for synthesizing needle coke. The preparation method includes: step S1, using an extraction solvent to extract the pitch in the coal liquefaction residue to obtain refined pitch, and the extraction solvent is selected from coal liquefied oil, N-methylpyrrolidone, tetrahydrofuran, quinoline, One or more of the group consisting of pyridine and anthracene oil; in step S2, polycondensation reaction of powdery asphalt is performed to form polycondensation asphalt...
Embodiment 1
[0056] The coal liquefaction residue of ≤5mm and pyridine were added to the stirring tank 3 according to the mass ratio of 1:1, and after stirring evenly, at a nitrogen pressure of 0.1 MPa, a temperature of 150 ° C, and a stirring rate of 200 r / min. The transfer pump is sent to the primary filtration kettle, and under the protection of nitrogen, the mixed solution is thermally filtered at a filtration temperature of 150 ° C and a pressure of 0.5 MPa, and the filtration accuracy of the filter material in the primary filtration kettle is 50 microns; The extraction mixture is sent to the secondary filtration kettle by the primary filtrate transfer pump. Under the protection of nitrogen, the filtration temperature is 200 °C, and the pressure is 1 MPa to thermally filter the mixture. The filtration accuracy of the filter material in the secondary filtration kettle is 1 micron. ; The extraction mixture is sent to the vacuum distillation kettle by the secondary filtrate pump, and the ...
Embodiment 2
[0059] The coal liquefaction residue of ≤5mm and anthracene oil are added to the stirring tank according to the mass ratio of 1:3, and after stirring evenly, the nitrogen pressure is 1MPa, the temperature is 200℃, and the stirring rate is 100r / min. After extraction for 0.5 hours, conveying through extraction The pump is pumped into the primary filtration kettle, and under the protection of nitrogen, the mixture is filtered hot at a filtration temperature of 200 °C and a pressure of 1 MPa. The filtration accuracy of the filter material in the primary filtration kettle is 30 microns; The liquid is sent to the secondary filtration kettle by the primary filtrate pump. Under the protection of nitrogen, the filtration temperature is 200 °C, and the pressure is 2 MPa to perform thermal filtration on the mixed liquid. The filtration accuracy of the filter material in the secondary filtration kettle is 5 microns; The extraction mixture is sent to the vacuum distillation kettle by the se...
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