Hydrogenation method for brown coal directly liquefied circulating solvent

A circulating solvent, direct technology, applied in the field of hydrogenation of lignite direct liquefaction circulating solvent, can solve the problem of not being able to provide free hydrogen, and achieve the effect of avoiding a large excess of hydrogen, reducing the possibility, and homogenizing the temperature distribution

Active Publication Date: 2009-02-18
ZHAOQING SHUNXIN COAL CHEM TECH
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Problems solved by technology

Although the hydrogenation depth of the solvent can be controlled by changing the conditions, the saturation of the hydrogenation solvent is still similar to that of the hydrogenated petroleum product, and the product with a shallow hydrogenation depth is basically a mixture of saturated and unsaturated hydrocarbons, which cannot provide more free hydrogen (—H) to fully meet the needs of coal liquefaction

Method used

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  • Hydrogenation method for brown coal directly liquefied circulating solvent

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Embodiment 6

[0085] The pressure in Example 6 is the highest, which is beneficial to the hydrogenation reaction. In order to prevent the hydrogenation saturation of the product from being too high, the lowest hydrogen-to-oil ratio and the largest space velocity were adopted, so the hydrogenated aromatics content (83.22m%) of this example was only slightly higher than that of Example 5 (80.13m%) 3.09m%.

[0086] The data in Table 2 show that due to the lower content of non-ideal components in feedstock 2, the hydrogenated aromatics content of its products is still higher than that of feedstock 1 despite its higher reaction space velocity.

Embodiment 7

[0087] Example 7 uses the mixed products of Examples 1-4 as a solvent to conduct lignite hot-melt catalysis test, and Example 8 uses a non-hydrogenated circulating solvent to carry out lignite hot-melt catalysis test, and the two are compared. The tests were all carried out in a 2000ml autoclave. After the reaction material was in good shape, it was pressurized with nitrogen to the reaction pressure, the pressure was controlled to be constant, and the temperature was raised to react under stirring. The test results are shown in Table 3.

[0088] Table 3 Comparison of lignite hot-melt catalysis test with hydrogenation solvent and non-hydrogenation solvent

[0089] Example 7 8 solvent type hydrogenation Without hydrogenation Reaction pressure, MPa 5.2 5.2 Reaction temperature, °C 400 400 Response time, min 30 30 Agent-to-coal ratio, m / m 3:1 3:1 Catalyst, g 1.0 1.0 Input lignite (daf), g 250 250 Add solvent (daf),...

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Abstract

A hydrogenation process for brown coal direct liquefaction circulation solvent comprises two reactors, the first of which is mainly filled with protecting catalyst with lower hydrogenation activity and the second of which is primarily filled with main catalyst with higher hydrogenation activity, which forms a catalyst grading suitable for a balanced hydrogenation / dehydrogenation reaction for the solvent. Through the process, all compounds in the hydrogenated solvent can reach even degree of incomplete saturation in molecular structure, which improves transferable hydrogen content of molecules, accordingly the free hydrogen(-H) released by circulation solvent can meet the need of hydrogen consumption of direct liquefaction of brown coal. The process can simplify the industrial process of direct liquefaction and solvent hydrogenation, reduce the device requirement, and save investment and operating cost.

Description

technical field [0001] The invention relates to a hydrogenation method of a coal liquefaction solvent, in particular to a hydrogenation method of a lignite direct liquefaction circulating solvent. Background technique [0002] The direct coal liquefaction method generally involves catalytic hydrogenation of coal and solvent oil under high temperature (400-500°C) and high-pressure (10.0-30.0MPa) conditions to generate a liquid fuel product with a high hydrogen-carbon ratio, which is used to supplement and replace Increasing shortage of petroleum fuel products. In the various existing coal direct liquefaction processes, some of them have carried out hydrogenation treatment on the solvent, so that the solvent has a certain hydrogen-donating effect. For example, Exxon's hydrogen-donating solvent (EDS) process and Japan's NEDOL process use fixed-bed hydrogenation technology to hydrogenate circulating solvents, and Germany's IGOR + Process and Chinese coal direct liquefaction pr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10G65/08C10G1/00C10G45/00
CPCC10G1/086C10G1/006
Inventor 彭派吴克
Owner ZHAOQING SHUNXIN COAL CHEM TECH
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