High Temperature Coal Tar Distillate Hydrogenation Unit with Low Aromatic Oil Recycle

Abstract

The invention discloses a high-temperature coal tar distillate oil hydrogenation device with low aromatic oil circulation. The high-temperature coal tar distillate oil hydrogenation device comprises a vacuum distillation tower, a hydrorefining reactor, a separation system, a desulfurizing tower, a fractionating tower and a hydrocracking reactor, wherein a high-temperature coal tar inlet is formed in the vacuum distillation tower; a heavy distillate outlet is formed in the bottom of the vacuum distillation tower; a light distillate outlet is formed in the top of the vacuum distillation tower; a reaction feeding hole connected with the light distillate outlet is formed in the top of the hydrorefining reactor; a discharge hole is formed in the bottom of the hydrorefining reactor and is connected with the separation system; a hydrogen outlet is formed in the top of the separation system; a liquid-phase outlet is formed in the bottom of the separation system and is connected with the desulfurizing tower; a liquid-phase outlet connected with the fractionating tower is formed in the bottom of the desulfurizing tower; a distillate outlet is formed in the fractionating tower; one part of distillate which is greater than 350 DEG C is fed to the hydrocracking reactor as untransformed oil; the other part is mixed with light distillate as low aromatic oil and is fed to the hydrorefining reactor; a feeding hole is formed in the top of the hydrocracking reactor; and an outlet connected with the separation system is formed in the bottom of the hydrocracking reactor. The high-temperature coal tar distillate oil hydrogenation device has the characteristics of being reasonable in structure, and simple to operate, and the reaction temperature is easy to control.

Description

technical field [0001] The invention belongs to the technical field of coal chemical industry, and in particular relates to a high-temperature coal tar distillate oil hydrogenation device with low-aromatic oil circulation. Background technique [0002] Coal tar is one of the important by-products of coal coking and occupies a certain share in the production of coal coke. Based on the current coal coking technology, coal tar production accounts for about 3.5% to 4.2%. However, due to the constraints of backward technology in the downstream chemical industry, the huge amount of coking by-products of coal tar is difficult to use with high added value. At present, the consumption market of high-temperature coal tar in my country is mainly divided into three parts, one is to use crude coal tar as a fuel to replace heavy oil, to use it in thermal energy industries such as glass and ceramics, and as a raw material for producing carbon black; the other is to export it; the third is...

AI Technical Summary

Problems solved by technology

In the process of processing high-temperature coal tar, due to the high content of high-temperature coal tar pitch, it is easy to cause coking of the catalyst in the hydrotreating reactor; Vigorous, making it difficult to control the temperature of the hydrofining reactor and difficult to operate

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