A method of preparing spinnable mesophase pitch by hydrogen catalysis-hydrogen treatment of coal tar pitch

Abstract

The invention discloses a method for preparing spinnable mesophase pitch through coal pitch hydrocatalysis-hydrogen supply treatment. The method comprises the following steps: (1) adding aids into coal pitch, promoting primary inorganic mineral to form a dispersed catalyst in situ under the high-temperature hydrogen condition, performing hydrocatalysis treatment on the coal pitch, performing reduced pressure distillation after reaction to remove a fraction with low boiling point to obtain primary hydrogenated pitch; (2) adding a hydrogen supply agent into the primary hydrogenated pitch, performing hydrocatalysis-hydrogen supply cooperative treatment under the high-temperature hydrogen condition, and performing reduced pressure distillation to remove a fraction with low boiling point to obtain secondary hydrogenated pitch; (3) removing a quinoline insoluble substance from the secondary hydrogenated pitch to obtain refined hydrogenated pitch; and (4) performing thermal polymerization reaction on the refined hydrogenated pitch to obtain the spinnable mesophase pitch. Through hydrocatalysis-hydrogen supply combined treatment, formation and transformation of the mesophase pitch can be effectively regulated and controlled; and the obtained spinnable mesophase pitch has excellent quality, moderate softening point and high mesophase content and can be applied to preparation of high-performance pitch-based carbon fiber.

Description

technical field [0001] The invention relates to the field of carbon material preparation and processing, in particular to a method for preparing spinnable mesophase pitch by hydrogen catalysis-hydrogen supplying treatment of coal tar pitch. Background technique [0002] Mesophase pitch is an anisotropic carbonaceous substance composed of a variety of flat disk-shaped condensed ring aromatics. It is often used as an excellent carbon precursor for high-performance carbon materials. Its raw materials are coal tar pitch, petroleum pitch and heavy aromatics. compounds etc. High-quality mesophase pitch is the precursor for preparing high-performance pitch-based carbon fibers. Mesophase pitch-based carbon fibers have significant advantages such as high thermal conductivity and high modulus, and are widely used in aerospace, aviation, sports, entertainment, transportation and other fields. [0003] The regulation of the molecular structure and composition of raw pitch is a key fact...

AI Technical Summary

Problems solved by technology

This method has problems such as the need to remove quinoline insolubles many times, the severity of catalytic hydrogenation is high, and the solid catalyst is difficult to avoid carbon deposition.

Patent CN85105609A proposes a coal tar pitch hydrogenation method, using a fixed-bed metal-supported solid catalyst, which has low catalytic hydrogenation activity and weak hydrogenation ability, and it is difficult to effectively improve the molecular structure and composition of pitch, and there are multiple removals of quinoline insolubles A step of

Patent CN107760348A thermally polymerizes the refined coal liquefaction residue in the presence of a hydrogen donor and under the protection of nitrogen to obtain mesophase pitch. However, since the coal liquefaction residue is composed of fused-ring aromatics with a high degree of polymerization and condensation, the It is difficult to control the formation and conversion of mesophase pitch by hydrogenation modification of hydrogen donor