Method for increasing utilization ratio of additional value of high-temperature coal tar

Abstract

The invention discloses a method for increasing the utilization ratio of the additional value of high-temperature coal tar, belonging to the technical field of chemical industry. According to the method, the selective catalytic hydrogenation conversion reaction of the high-temperature coal tar is carried out through a high-pressure reaction device under the action of a hydrogenation catalyst by taking the high-temperature coal tar or a high-temperature coal tar solution obtained by mixing the high-temperature coal tar and an organic solvent according to a certain mass ratio as a raw material, so that a condensed-ring aromatic compound and particularly coal pitch in the high-temperature coal tar are directionally converted into a low-ring aromatic compound, wherein the high-temperature coal tar can directly enter the current high-temperature coal tar processing device after being subjected to selective hydrogenation and quality improvement so as to be subjected to the subsequent separation, processing and utilization; and the coal pitch in the high-temperature coal tar subjected to the selective hydrogenation and quality improvement can be used for producing a high-performance carbon material. By using the method, not only is the bottleneck problem generated in processing of the high-temperature coal tar for treating the coal pitch solved, but also the high utilization ratio of the additional value of the high-temperature coal tar is realized under the condition that the traditional high-temperature coal tar processing method is not changed.

Description

technical field [0001] The invention belongs to the technical field of chemical industry, and in particular relates to the high value-added utilization of high-temperature coal tar. Background technique [0002] my country is rich in coal tar resources, among which low- and medium-temperature coal tars are mainly aliphatic compounds and less aromatics. The important direction of research is to process them as unconventional petroleum resources to produce clean fuel oil ( clean coal technology , 2011,17:31-35; Fuel, 2011, 90:3404-3409; Fuel, 2012, 91:33-39.); High-temperature coal tar is one of the main secondary chemical products recovered from coking gas. It is rich in unique aromatic fused ring compounds, and its aromaticity is above 0.9. It is a valuable chemical resource. In the existing distillation and separation process, the yield of coal tar pitch is as high as about 55%, and the outlet of coal tar pitch has always been the bottleneck problem restricting the co...

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Problems solved by technology

[0002] China is rich in coal tar resources, among which low- and medium-temperature coal tars are mainly aliphatic compounds and less aromatics. The important direction of research is to use them as unconventional petroleum resources processed to produce clean fuel oil (Clean Coal Technology, 2011, 17:31-35; Fuel, 2011, 90:3404-3409; Fuel, 2012, 91:33-39.); High-temperature coal tar is one of the main secondary chemical products recovered from coking gas. Chemical resources, in the existing distillation and separation process, the yield of coal tar pitch is as high as 55%, and the outlet of coal tar pitch has always been the bottleneck problem restricting the coal tar processing industry, and its low price has seriously affected the production of tar The economic benefits of processing enterprises, coupled with the current high oil price, force a large amount of high-temperature coal tar to be abandoned for processing and used as fuel for direct burning, seriously wasting precious chemical product resources

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