Two-stage hydrogenation process of coal tar

A process method, coal tar technology, which is applied in the field of coal chemical industry, can solve the problems of short operation period and not involving the utilization rate of coking heavy distillate oil, and achieve the effects of avoiding cracking reaction, easing operating conditions, and low product yield

Active Publication Date: 2013-01-02
上海竣铭化工工程设计有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method also does not involve the improvement of the utilization rate of coking heavy distillate oil, and the short operation period of the hydrocracking catalyst due to coking

Method used

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  • Two-stage hydrogenation process of coal tar

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0072] The low-temperature dry distillation coal tar of ylang-ylang lignite, whose properties are shown in Table 1, is sent to the pretreatment unit to remove mechanical impurities and water, and then enters the atmospheric fractionation tower to fractionate light distillate oil (top oil), bottom oil and phenol oil ( The phenolic oil extracted from the side line), the phenolic oil enters the phenolic oil extraction device to separate the phenolic products and dephenolic oil. The dephenolized oil and the light distillate bottom oil are mixed and then enter the hydrotreating unit for hydrotreating reaction. The gasoline fraction and diesel fraction obtained by the hydrotreating reaction can be discharged from the device, and the heavy distillate oil (heavy distillate) obtained by the hydrotreating reaction The oil and diesel oil are cut at 325℃) into the hydrocracking unit for hydrocracking reaction. The hydrocracking reaction product is separated into gas phase and liquid phase ...

Embodiment 2

[0074] The hydrotreating catalyst (by weight oxide) was prepared with the following composition: Mo, 30.0%; W, 8.0%; Ni, 2.5%; Co, 2.0%.

[0075] The solution containing active components is a solution containing ammonium metatungstate, ammonium molybdate, nickel nitrate, and cobalt nitrate; the peptizer is nitric acid, the extrusion aid is Tianqing powder, and the pore expanding agent is carbon black.

[0076] (1) Preparation of silicon-containing aluminum hydroxide. The solid sodium aluminate is formulated into a concentration of 200gAl 2 O 3 / L concentrated sodium aluminate solution, and then diluted to a concentration of 25gAl 2 O 3 / L sodium aluminate working solution, first add 10L containing 25g Al in the gel forming tank 2 O 3 / L sodium aluminate working solution, and at the same time pass air and CO with a concentration of 45v% 2 Gas, the reaction temperature is 25 ° C, the reaction time is 1 hour, and when the pH value is reacted to 12.0, the alkaline silicon-c...

Embodiment 3

[0081] The raw material is a certain mixed coal tar, and the main properties are shown in Table 2. The reaction temperature of the hydrotreating section is 350°C. Before the hydrotreating section, a hydrogenation protection agent is used for pretreatment. The hydrogenation protection agent is a conventional hydrogenation protection agent, using alumina as a carrier, containing 6% molybdenum oxide and 1 cobalt oxide. %, pore volume is 0.82mL / g, specific surface area is 128M 2 / g. The treatment conditions of the hydrogenation protective agent are: the reaction temperature is 310℃, the pressure is 15.1MPa, the volume ratio of hydrogen to oil is 1200:1 and the liquid hourly volume space velocity is 1.2h -1 . Others are the same as in Example 2.

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Abstract

The invention discloses a two-stage hydrogenation process of coal tar. The process comprises the steps of: (a) sending a coal tar raw material into a hydrotreating reaction section, and carrying out a hydrotreating reaction on the coal tar by contacting with a hydrotreating catalyst in the presence of hydrogen and under hydrogenation conditions; (b) carrying out gas-liquid separation on an effluent from the hydrogenating reaction section, and sending a separated liquid phase into the a fractionation device, in order to distillate out a light fraction and a heavy fraction; (c) sending at least part of the heavy fraction from the step (b) into a hydrocracking reaction section, and carrying out a hydrocracking reaction on the heavy fraction by contacting with a hydrocracking catalyst in the presence of hydrogen and under hydrogenation cracking conditions; and (d) sending an effluent from the hydrocracking reaction section into a hot high pressure separator, in order to separate out a gas phase and a liquid phase, and sending at least part of the liquid phase to the hydrotreating reaction section in the step (a). Compared with the prior art, the method provided by the invention improves the yield of light fuel production from coal tar, prolongs the service life of a catalyst, and increases operation cycle of the device.

Description

technical field [0001] The invention relates to a two-stage hydrogenation process method for coal tar, belonging to the field of coal chemical industry. Background technique [0002] The shortage of the world's crude oil resources is imminent, and the distribution is extremely uneven, while the coal storage is very rich, so the use of coal to produce vehicle fuel oil is a necessary way. The main technologies of coal-to-liquids include direct liquefaction of coal and indirect liquefaction of coal, but these technologies are costly and complex. Another technology for producing coke can produce coal tar as a by-product while producing coke, which is a widely used method at present. However, the further processing of coal tar is more difficult, the utilization method is relatively simple, and the price is relatively low, and the product outlet is not smooth, which is a waste of existing resources, especially in the use process, which has a great impact on the environment. [0...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10G67/02
Inventor 王小英
Owner 上海竣铭化工工程设计有限公司
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