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A kind of combined processing method of coal tar

A combined processing and coal tar technology, applied in the petroleum industry, hydrotreating process, hydrocarbon oil treatment, etc., can solve the problems of low utilization rate of coal tar, inability to obtain high-quality coke and distillate at the same time, etc. Utilization rate, strong adaptability of raw materials, effect of protective activity

Active Publication Date: 2014-10-22
CHINA PETROLEUM & CHEM CORP +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The coal tar processing method described above has a low utilization rate of coal tar, and cannot obtain high-quality coke and distillate oil at the same time

Method used

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  • A kind of combined processing method of coal tar

Examples

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Effect test

Embodiment 1

[0021] A medium and low temperature coal tar is used as the feedstock oil. Its properties are shown in Table 1. It is separated by continuous distillation under reduced pressure. Heavy oil fraction at 370°C. The heavy oil distillate at 370°C is used for solvent deasphalting. The solvent used in the solvent deasphalting device is propane, the volume ratio of propane to heavy oil is 3:1, the operating temperature is 65°C, the deasphalted oil obtained after solvent deasphalting is dehydrogenated, the deoiled pitch decoking device, and the operation of the coking tower The temperature is 500°C and the pressure is 1.8Mpa. The coke produced by the coking unit is discharged as a product, and the coking gas and diesel after the separation of the coking produced oil will undergo hydrogenation reaction with other distillates. The reaction conditions of the hydrogenation reaction in the method of the present invention are:

[0022] Hydrofining section: total reaction pressure 14Mpa, spac...

Embodiment 2

[0034] The solvent used in the solvent deasphalting device in this example is isopropanol, and other conditions are the same as in Example 1. The analysis of the 3000-hour operation results is shown in Table 2, Table 3 and Table 4.

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PUM

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Abstract

The invention discloses a coal tar combined machining method, which includes the following details: coal tar enters a prefractionator; a light component is extracted from the tower top; a side-line product is used as a hydrogenation raw material; a heavy component flows out from the tower bottom and is mixed with coking slurry oil separated from a coker fractionating tower, and the mixture enters a solvent deasphalting device; deasphalted oil is used as a hydrogenation raw material; deoiled asphalt enters a coking unit to obtain a coke product; coker oil enters the coker fractionating tower; fuel gas at the tower top is discharged; coker gasoline and coker heavy diesel fuel are used as hydrogenation raw materials; slurry oil at the tower bottom enters the solvent deasphalting device; various separated hydrogenation raw materials and hydrogen are mixed and enter a hydrotreating reactor; a hydrotreating product undergoes gas-liquid separation and a liquid phase enters a product fractional device so as to obtain liquefied gas, naphtha, diesel and tower bottom tail oil; the tower bottom tail oil enters a hydrocracking reactor; and a reaction effluent enters into the hydrotreating reactor. The method provided by the invention can be used to raise utilization rate of coal tar and improve the quality of distillate and coke.

Description

Technical field [0001] The invention relates to a combined processing method of coal tar. technical background [0002] Coal tar is a liquid product obtained during the dry distillation and gasification of coal. China is rich in coal tar resources, with an annual output of more than 4 million tons. However, due to the difference in dry distillation raw materials and dry distillation conditions, the composition of medium and low temperature coal tar and high temperature coal tar is very different. The big difference is that, in addition to containing more phenols, medium and low temperature coal tar contains more alkanes and naphthenes but less aromatics. A large amount of phenols and cresols are recovered from them and used in the production of plastics, resins and pesticides. The phenol fraction will be an excellent raw material for hydrogenation to produce light fuel oil. Medium and low temperature coal tar processing products have a wide range of uses. They can produce liquid...

Claims

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Application Information

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IPC IPC(8): C10G69/00
Inventor 高景山张英齐慧敏廖昌建李经纬
Owner CHINA PETROLEUM & CHEM CORP
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