US 9,994,775 B2Granted

Process for producing mesophase pitch by hydrogenation of high-temperature coal tar

AssigneesEco Environmental Energy Research Institute Limited, Dalian University of Technology

InventorsHongmei Zhao, Jieshan Qiu, Kam Shing Philip Siu, Baoming Li, Junde Steve Lu, Nan Xiao

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Abstract

A process for producing mesophase pitch from high-temperature coal tar comprises: removing salts and quinoline insoluble fraction from a high-temperature coal tar to obtain a decant oil; using the decant oil as a hydrogenation feedstock, or pre-distilling the decant oil to obtain a residue with a boiling point higher than 230 and formulating the residue into a hydrogenation feedstock; catalytic hydrorefining the hydrogenation feedstock to obtain a hydrofined oil; distilling the hydrofined oil to obtain hydrogenated pitch; and subjecting the hydrogenated pitch to the thermal polymerization to obtain the mesophase pitch. The process has features such as an easily controllable degree of hydrogenation, complete removal of impurities, good raw material flowability, not tending to form the carbon deposition and the coking during the process, and not tending to jam the reactor. The product has a high content of mesophase pitch, a low softening point and a low impurity content.

Claims39

Dependent claims

A process for producing mesophase pitch from high-temperature coal tar, comprising:

(1) removing salts and quinoline insoluble fraction from a high-temperature coal tar to obtain a decant oil;
(2) obtaining a hydrogenation feedstock from the decant oil via either of the following two approaches:
(2a) using the decant oil as the hydrogenation feedstock;
or
(2b) pre-distilling the decant oil to obtain a residue with a boiling point higher than 230° C., and mixing the residue with formulated oil to obtain the hydrogenation feedstock, wherein the formulated oil comprising one or more components selected from the group consisting of distillation fractions of coal tar and the hydrogenated product of the distillation fractions of coal tar;
(3) catalytic hydrorefining the hydrogenation feedstock to obtain a hydrofined oil;
(4) distilling the hydrofined oil to obtain hydrogenated pitch;
and
(5) subjecting the hydrogenated pitch to the thermal polymerization to obtain the mesophase pitch,
wherein in the distilling further comprises obtaining a hydrogenated high boiling point solvent with a boiling spread of 300-360° C. and a hydrogenated distillation fraction with a boiling spread of 80-300° C.

7 more elements

Dependencies are inferred from the claim text.