A kind of preparation method of refined asphalt

Abstract

The present invention relates to the technical field of deep processing of coal tar pitch, in particular to a preparation method of refined pitch, comprising the following steps: 1) mixing raw pitch with catalyst, auxiliary agent and circulating oil to obtain slurry; 2) boosting the pressure to react After pressure, the slurry is mixed with hydrogen, heated to the reaction temperature, and hydrogenation reaction is carried out. The reaction product enters the separation system, and the gas and liquid phase are separated in the separation system; 3) The liquid phase obtained by the separation system enters the filter, The oil separated from the filter is separated by a fractionation system to obtain hydrogenated pitch; 4) The hydrogenated pitch is boosted to the extraction pressure and heated to the extraction temperature before entering the extraction tower; 5) The extraction solvent is boosted to the extraction pressure and heated After reaching the extraction temperature, it enters the extraction tower. After extraction, the extraction phase flows out, and the refined asphalt is obtained after desolventization. The invention can prepare high-quality refined asphalt with stable performance, low sulfur, low ash, low quinoline insoluble matter and narrow fraction distribution.

Description

technical field [0001] The invention relates to the technical field of deep processing of coal tar pitch, in particular to the technical field of preparing carbon materials from coal tar pitch, and in particular to a preparation method of refined pitch. Background technique [0002] Coal tar pitch is a carbon-rich hydrocarbon resource, in which the aromatic carbon content is generally in the range of 70%-95%, which is much higher than that in petroleum pitch. Therefore, coal tar pitch is a high-quality carbon material. raw material. According to different sources and compositions, coal tar is often divided into two types: medium and low temperature coal tar and high temperature coal tar. In traditional processing, medium and low temperature coal tar and its pitch are often used to produce light oil products (such as gasoline, diesel oil, etc.) products), such as patent CN104946306B, patent CN106701178B and other technologies are all based on naphtha and diesel oil, and high...

AI Technical Summary

Problems solved by technology

Refined asphalt with very low sulfur and nitrogen content can be obtained with this technology, but its biggest problem is that it is difficult to apply to industrial long-term stable production because: first, the solid matter in the oil produced by the suspended bed is separated by filtration, Ultrafine particles with a particle size of less than 0.5 microns can easily block the filter and cannot make the production device operate stably for a long period of time

Second, a small amount of ultrafine particles remaining after filtration will block the catalyst bed of the subsequent hydrofining reactor, so that the production unit cannot be stably produced for a long period of time

[0017] In summary, it can be seen that the existing technologies for preparing coal-based refined asphalt have the following two problems: First, they are not suitable for industrial production processes because they cannot operate stably for a long period of time.

Second, due to the unsatisfactory quality of refined pitch products, it is restricted from being used for the preparation of high-end carbon materials, such as high sulfur content, high ash content, high quinoline insoluble content, etc.

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