Impregnated pitch with low quinoline insoluble content, low softening point and high residual carbon and preparation process and application of impregnated pitch

Abstract

The invention relates to the field of chemical engineering and discloses a preparation process of impregnated pitch. The preparation process includes the steps: (1) adding purified earth pitch serving as raw materials into a reactor, heating the raw materials to the temperature of 375-410 DEG C with the heating rate of 6-8 DEG C / min under the condition of stirring, and carrying out constant pressure pyrocondensation polymerization reaction for 30-75min at the temperature of 375-410 DEG C; and (2) stirring and decreasing the temperature in the reactor to be lower than 300 DEG C with the cooling speed of 8-10 DEG C / min. A softening point of the prepared impregnated pitch with the low quinoline insoluble content, the low softening point and the high residual carbon ranges from 84 DEG C to 91 DEG C, the quinoline insoluble content is less than 0.3%, the coking value ranges from 46% to 49.5%, the toluene insoluble content ranges from 15% to 22%, and the impregnated pitch can be used for impregnation and densification of carbon products such as graphite electrodes.

Description

technical field [0001] The invention belongs to the field of chemical industry, and in particular relates to an impregnated asphalt, in particular to an impregnated asphalt with low quinoline insoluble content, low softening point and high carbon residue, and its preparation process and application. Background technique [0002] Due to process, equipment and other reasons, carbon products such as graphite electrodes have pores to varying degrees during the extrusion molding process of ingredients, and the pores account for about 25% of the volume of carbon products. The existence of pores reduces the bulk density and mechanical strength of carbon products, and the heat transfer and electrical conductivity are also relatively poor. The carbon products impregnated with the impregnating agent pitch not only increase the bulk density, but also improve the mechanical strength, electrical conductivity and thermal conductivity. Therefore, impregnation is an important means to impro...

AI Technical Summary

Problems solved by technology

[0011] 1. There is no control on the quinoline insoluble (QI) content of the key quality index. Generally speaking, the quinoline insoluble (QI) content of medium-temperature coal tar pitch is greater than 3%, and the heat treatment process of pitch will inevitably produce secondary quinoline Quinoline insoluble matter, so the quinoline insoluble matter (QI) content index of the product obtained by this patent must far exceed this index of foreign products

[0012] 2. The impregnation process requires the impregnating agent asphalt to have a high coking value (CV) and a low softening point, but judging from the examples of this patent, this technology fails to solve this technical problem well

[0013] 3. The operating conditions of high temperature and high pressure have high requirements on equipment, especially for industrialization, high pressure equipment brings high investment

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