Method for preparing mesophase pitch through FCC oil slurry two-stage hydroforming-heat polycondensation

Abstract

The invention provides a preparation method for a spinnable petroleum base mesophase pitch with high anisotropic structure content and low softening point. The method comprises the following steps: performing reduced pressure distillation on naphthenic crude catalytic cracking oil slurry, by taking a fraction with the boiling point at 380-540 DEG C as a raw material, and then performing constant-temperature constant-pressure reaction for 1-10h under the primary nitrogen pressure at 4MPa at 380-450 DEG C, thereby acquiring petroleum asphalt; performing self-boosting reaction on the petroleum asphalt for 1-8h under the primary nitrogen pressure at 6MPa at 400-440 DEG C, thereby acquiring the first hydrogenated pitch; performing constant-temperature constant-pressure reaction on the first hydrogenated pitch for 1-8h under the primary nitrogen pressure at 4MPa at 420-480 DEG C, thereby acquiring a first product; performing self-boosting reaction on the first product for 1-8h under the primary nitrogen pressure at 6MPa at 400-440 DEG C, thereby acquiring a secondary hydrogenated pitch; reacting the secondary hydrogenated pitch for 2-16h under the pressure at 4MPa at 420-480 DEG C, thereby acquiring the high-quality mesophase pitch. According to the invention, the production cost is low and the prepared mesophase pitch has the advantages of high anisotropic structure content (above 98%), low softening point (at 230-250 DEG C), large watershed optical structure and excellent spinning property.

Description

technical field [0001] The invention relates to a method for preparing mesophase pitch from catalytic cracking oil slurry of naphthenic crude oil through a two-stage hydrogen modification-thermal polycondensation composite process, which belongs to the cross field of heavy oil processing and preparation of new carbon materials. Background technique [0002] Mesophase pitch (MP for short) is a nematic liquid crystal substance composed of a variety of flat disk-shaped condensed ring aromatics. It has liquid characteristics in terms of fluidity, viscosity, and deformation. However, it has physical properties similar to crystals in aspects such as magnetism and magnetism. Due to its excellent performance, high carbon yield and strong processability, mesophase pitch has become an excellent matrix for many advanced functional materials, and can be used to prepare a variety of high-performance carbon materials, such as ultra-high modulus pitch-based carbon fibers, Needle coke, car...

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to provide a method for preparing mesophase pitch through a two-stage hydrogen modification-thermal polycondensation composite process using the distillate with a boiling point between 380 and 540°C in the catalytic cracking oil slurry of naphthenic crude oil as raw material, so as to solve the problem of Petroleum-based mesophase pitch has high softening point and poor spinning performance