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Two-stage combined hydrogenation process of coal tar

A process method and coal tar technology, which is applied in the field of coal chemical industry, can solve the problems of unrelated coking heavy distillate oil utilization rate and short operation cycle, and achieve the effects of full utilization of energy, low operation energy consumption, and reduction of equipment investment

Active Publication Date: 2014-08-13
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 combined hydrogenation process of coal tar

Examples

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Comparison scheme
Effect test

Embodiment 1

[0075] The low-temperature dry distillation coal tar of Yilan 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 phenolic products and dephenolized oil. After mixing the dephenolized oil and light distillate oil, the tower bottom oil enters the hydrotreating unit for hydrotreating reaction. The gasoline fraction and diesel fraction obtained from the hydrotreating reaction can exit the unit, and the heavy distillate oil (heavy distillate fraction) obtained from the hydrotreating reaction Oil and diesel are cut at 360°C) into the hydrocracking unit for hydrocracking reaction, the hydrocracking reaction product is separated into gas phase and liquid phase in the hot h...

Embodiment 2

[0077] The hydrotreating catalyst (by weight of oxides) was prepared with the following composition: Mo, 30.0%; W, 8.0%; Ni, 2.5%; Co, 2.0%.

[0078] The solution containing the active components is a solution containing ammonium metatungstate, ammonium molybdate, nickel nitrate, and cobalt nitrate; the peptizer is nitric acid, the extrusion aid is azurite powder, and the pore expander is carbon black.

[0079] (1) Preparation of silicon-containing aluminum hydroxide. Prepare solid sodium aluminate to a concentration of 200gAl 2 o 3 / L concentrated sodium aluminate solution, then diluted to a concentration of 25gAl 2 o 3 / L sodium aluminate working solution, first add 10L containing 25gAl to the gel forming tank 2 o 3 / L sodium aluminate working solution, while passing air and passing 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 reaches 12.0, add alkaline silicon-containing materials according...

Embodiment 3

[0084] The raw material is a mixed coal tar, the main properties are shown in Table 2. The reaction temperature of the hydrotreating section is 350°C. Before the hydrotreating section, a hydrogenation protecting agent is used for pretreatment. The hydrogenation protecting agent is a conventional hydrogenation protecting agent, with alumina as the carrier, containing 6% molybdenum oxide and 1% cobalt oxide. %, the pore volume is 0.82mL / g, and the specific surface area is 128M 2 / g. The treatment conditions of the hydrogenation protective agent are reaction temperature 310°C, pressure 15.1MPa, hydrogen oil volume ratio 1200:1 and liquid hourly volume space velocity 1.2h -1 . Others are identical with embodiment 2.

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Abstract

The invention discloses a two-stage combined hydrogenation process of coal tar. The process comprises the steps of: (a) sending a coal tar raw material into a hydrogenation reaction section for a hydrotreating reaction; (b) carrying out a gas-liquid separation on an effluent from the hydrogenating reaction section, and sending a separated liquid phase into the a fractionation device, so as to distillate out a gasoline fraction, a diesel fraction and a heavy fraction; (c) sending at least part of the heavy fraction from the step (b) into a hydrocracking reaction section for a hydrocracking reaction; (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); (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 process method of coal tar two-stage hydrogenation combination, which belongs to the field of coal chemical industry. Background technique [0002] The shortage of crude oil resources in the world is imminent, and the distribution is extremely uneven, while the coal reserves are very abundant, so using coal to produce vehicle fuel oil is a necessary way. The main technologies of coal-to-oil include direct liquefaction of coal and indirect liquefaction of coal, etc., but these technologies are costly and complicated. Another coke production technology can produce coal tar by-product while producing coke, which is a widely used method at present. However, the further processing of coal tar is relatively difficult, the utilization method is relatively single, and the price is relatively low, and the product outlet is not smooth, which is a waste of existing resources, especially in the process of use, which has a very large imp...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C10G65/12
Inventor 王小英
Owner 上海竣铭化工工程设计有限公司
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