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Coal liquefaction method

A technology of coal liquefaction and coal liquefaction oil, which is applied in coal liquefaction and coal liquefaction fields including solvothermal extraction pretreatment, can solve the problems of high processing cost, ash content reduction, equipment corrosion, etc., and achieve good economy, reliable source, good quality The effect of hydrogen donating

Active Publication Date: 2010-02-10
CHINA COAL RES INST +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Some researchers use the method of acid-base hydrothermal treatment to achieve the goal of deashing (WO2004039927 and CN1708574A), but this method is difficult to reduce the ash content in coal to below 1%, and more importantly, the strong acid used in the acid-base treatment process , Strong alkali will cause serious corrosion of equipment, resulting in relatively expensive treatment costs

Method used

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  • Coal liquefaction method

Examples

Experimental program
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Effect test

Embodiment 1

[0024] Datang Shengli lignite (45.7% dry ash-free volatile matter (Vdaf), 13.20% dry basis ash content (Ad), 71.66% C, 4.75% H, 21.42% O) was pulverized to obtain a 100-mesh coal powder test samples and dried to a moisture content of less than 2%. Take 30g (calculated as dry coal) of coal powder, add 60g of coal liquefaction and hydrogenation circulating solvent as a thermal extraction agent, place in an autoclave reactor and stir and mix evenly at a speed of 150 rpm, fill with nitrogen to 1.0MPa, and heat up to 390°C, constant temperature reaction for 60min. After the reaction, use a 1 μm stainless steel filter element for hot filtration and separation to obtain the extract and raffinate. The extract is distilled, the hydrogenation circulating solvent is recovered, and the ultra-pure coal slurry is concentrated to a solvent content of 60% (weight). Then put the coal slurry into the swinging autoclave, add 3.0% (by weight) iron oxide catalyst and the same amount of co-cataly...

Embodiment 2

[0026] Black mountain bituminous coal (40.2% Vdaf, 3.4% Ad, 81.9% C, 5.3% H, 11.2% O) was pulverized to obtain a 120-mesh coal powder sample, and dried to a moisture content of less than 3%. Take 35g (calculated as dry coal) of coal powder, add 170g of coal liquefaction and hydrogenation circulating solvent as a hot extractant, place it in an autoclave reactor, stir and mix evenly at a speed of 400 rpm, and replace it with nitrogen for 3 times. Pressure to 0.5MPa, rapid temperature rise to 370°C, constant temperature reaction for 120min. After the reaction, the extracted solid-liquid mixture is subjected to centrifugal suspension separation to obtain solid matter and liquid matter. The liquid substance is back-extracted with n-hexane, and the hydrogenation circulating solvent is recovered to obtain solid ultra-pure coal. Coal slurry is prepared by mixing ultra-pure coal with liquefied hydrogenation circulating solvent, and the solvent content is 50% by weight. Then put the c...

Embodiment 3

[0028]Gansu Datan lignite (45.8% Vdaf, 18.8% Ad, 70.7% C, 4.6% H, 18.8% O) was pulverized to obtain a 200-mesh coal powder sample, and dried to a moisture content of less than 3%. Take 50g (calculated as dry coal) of coal powder, add 200g of coal liquefied hydrogenated heavy oil as a thermal extraction agent, place it in an autoclave reactor, stir and mix evenly at a speed of 300 rpm, replace it with nitrogen for 3 times, and pressurize to 1.2MPa, rapidly raise the temperature to 350°C, and react at a constant temperature for 90 minutes. After the reaction, the extracted solid-liquid mixture was hot-filtered with a 5 μm stainless steel filter element to obtain solid and liquid substances. The liquid matter is subjected to distillation treatment, and the solvent is recovered for recycling to obtain solid ultra-pure coal, and the ultra-pure coal is mixed with the liquefied hydrogenation circulating solvent to prepare coal slurry, and the solvent content is 60% (weight). Then pu...

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Abstract

The invention provides a coal liquefaction method, and the method comprises the following steps: (1) carrying out solvent thermal extraction pre-treatment on raw materials of coal; (2) carrying out thermal state solid-liquid separation; (3) concentrating the liquid part for obtaining ultra-pure coal slurry; or carrying out back extraction on the liquid part for preparing solid ultra-pure coal, andmixing with a thermal extraction solvent for preparing ultra-pure coal slurry; and (4) carrying out liquefaction reaction on the ultra-pure coal slurry for obtaining a coal liquefied oil product, wherein, the thermal extraction solvent is a liquid product obtained by carrying out hydrogenation treatment on the coal liquefied oil, such as the liquid products obtained by carrying out the hydrogenation treatment on coal liquefied light oil, coal liquefied middle oil and / or coal liquefied heavy oil, a coal liquefaction hydrogenation circulating solvent, or the mixture thereof. The method can reduce hydrogen consumption during the liquefaction process, water yield and gas yield, reduce wear on coal liquefaction equipment and be conductive to realizing the recycling of a coal liquefaction catalyst. The method can adopt any traditional liquefaction process and be conductive to saving energy consumption.

Description

technical field [0001] The invention belongs to the field of coal chemical processing, in particular to a coal liquefaction method, in particular to a coal liquefaction method including solvothermal extraction pretreatment. Background technique [0002] In my country's abundant coal resources, low-rank coals such as lignite and sub-bituminous coal account for more than 40%. Low-rank coal has high liquefaction reactivity and is easy to liquefy, so it is considered as an ideal raw material for direct coal liquefaction. The currently developed coal direct liquefaction process uses solid coal powder as raw material, feeds in the form of oil-coal slurry suspension, and directly liquefies with hydrogen under high temperature and pressure to convert into liquid oil, such as H-Coal technology, NEDOL technology and Shenhua coal liquefaction technology (CN1587351A), etc. However, some low-rank coals have a high ash content. When the ash in the coal enters the liquefaction system, it...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10G1/06
Inventor 李春启朱晓苏张胜振李文博石智杰忻仕河谷小会刘卫兵刘立麟陈颖
Owner CHINA COAL RES INST
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