Hydrogenation method for brown coal directly liquefied circulating solvent

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...

Examples

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),...

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...

Examples

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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