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Crude benzene catalytic hydrogenation process and equipment

A technology for catalytic hydrogenation and crude benzene, applied in the field of coal chemical industry, can solve problems such as short service life of catalysts, achieve long service life, avoid waste, and alleviate the effects of coking

Pending Publication Date: 2019-04-19
武汉聚川科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The purpose of the present invention is to overcome the above-mentioned technical deficiencies, provide a crude benzene catalytic hydrogenation process, and solve the technical problem of short service life of the catalyst in the crude benzene hydrogenation process in the prior art

Method used

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  • Crude benzene catalytic hydrogenation process and equipment
  • Crude benzene catalytic hydrogenation process and equipment
  • Crude benzene catalytic hydrogenation process and equipment

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0054] The raw material is coking crude benzene, and its composition and mass fraction are as follows: total aromatics 93.1%, diene value 2.5gI / 100g, bromine value 14.9gBr / 100g, total sulfur 2567mg / kg, total nitrogen content 589mg / kg. The hydrogenation reaction conditions are as follows: one-stage hydrogenation reaction temperature is 80℃, pressure is 2.0MPa, space velocity is 1.0h -1 , The hydrogen-to-oil ratio is 400:1; the second-stage hydrogenation reaction temperature is 190℃, the pressure is 4.0MPa, and the space velocity is 1.0h -1 , Hydrogen-oil ratio 600:1; three-stage hydrogenation reaction temperature is 270℃, pressure is 3.0MPa, and space velocity is 1.0h -1 , The ratio of hydrogen to oil is 600:1. After 120 days of continuous operation of the hydrogenation reaction, the results are shown in Table 2.

[0055] Table 2 Example 1 Hydrogenation results

[0056]

Embodiment 2

[0058] The raw material is coking crude benzene, and its composition and mass fraction are as follows: total aromatics 63.1%, diene value 10.5gI / 100g, bromine value 79.4gBr / 100g, total sulfur 3567mg / kg, total nitrogen content 889mg / kg. The hydrogenation reaction conditions are: one-stage hydrogenation reaction temperature is 130℃, pressure is 4.0MPa, and space velocity is 0.5h -1 , The hydrogen-to-oil ratio is 800:1; the second-stage hydrogenation reaction temperature is 220℃, the pressure is 2.0MPa, and the space velocity is 1.5h -1 , Hydrogen to oil ratio 800:1; three-stage hydrogenation reaction temperature 310℃, pressure 2.0MPa, space velocity 0.5h -1 , The ratio of hydrogen to oil is 300:1. After 120 days of continuous operation of the hydrogenation reaction, the results are shown in Table 3.

[0059] Table 3 Example 2 Hydrogenation results

[0060]

Embodiment 3

[0062] The raw material is coking crude benzene blended with other materials, and its composition and mass fraction are as follows: total aromatics 53.1%, diene value 12gI / 100g, bromine value 51.4gBr / 100g, total sulfur 5567mg / kg, total nitrogen content 789mg / kg. The hydrogenation reaction conditions are as follows: one-stage hydrogenation reaction temperature is 150℃, pressure is 3.0MPa, space velocity is 2.0h -1 , The hydrogen-oil ratio is 600:1; the second-stage hydrogenation reaction temperature is 170℃, the pressure is 3.0MPa, and the space velocity is 2.0h -1 , Hydrogen to oil ratio 400:1; three-stage hydrogenation reaction temperature 350℃, pressure 4.0MPa, space velocity 2.0h -1 , The ratio of hydrogen to oil is 450:1. After 120 days of continuous operation of the hydrogenation reaction, the results are shown in Table 4.

[0063] Table 4 Example 3 Hydrogenation results

[0064]

[0065]

[0066] It can be seen from the above three examples that after 120 days of continuous...

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Abstract

The invention discloses a crude benzene catalytic hydrogenation process, which comprises the following steps: carrying out catalytic reforming treatment on crude benzene, and then carrying out extractive distillation to obtain pure benzene. A first-stage gas-phase catalytic pre-hydrogenation step: mixing crude benzene and hydrogen, and heating to 80-140 DEG C under the condition of taking presulfurized NiMo as a catalyst; a second-stage gas-phase catalytic pre-hydrogenation step: heating a product obtained in the first-stage liquid-phase catalytic pre-hydrogenation step to 170-220 DEG C underthe condition of taking presulfurized NiW as a catalyst; a third-stage main catalytic hydrogenation reaction step: heating a product obtained in the second-stage gas-phase catalytic pre-hydrogenationstep to 270-350 DEG C under the condition of taking presulfurized NiCoMo as a catalyst. The crude benzene catalytic hydrogenation process realizes the full fraction hydrogenation of the crude benzene,does not need to remove heavy benzene components, and realizes the complete utilization of crude benzene resources. By adopting a three-stage hydrogenation process, the first-stage hydrogenation andthe second-stage hydrogenation are both used as pre-hydrogenation, so that the step-by-step hydrogenation saturation at low temperature can be well realized.

Description

Technical field [0001] The invention relates to the technical field of coal chemical industry, in particular to a crude benzene catalytic hydrogenation process and equipment. Background technique [0002] With the development of the organic synthesis industry, the demand for industrial pure benzene is increasing, and the increasing shortage of petroleum resources has severely restricted the output of crude petroleum benzene. As another source of pure benzene, the status of coking crude benzene is becoming more and more important. However, due to the improvement of environmental quality requirements, countries around the world have stricter and stricter limits on oil sulfur. Coking crude benzene is a kind of light fraction recovered from the crude gas from coal coking. The main components are benzene, toluene, xylene, and a small amount of non-aromatic components. In its purification process, the most critical is the removal of organic sulfur and easily coking substances. [0003...

Claims

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Application Information

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IPC IPC(8): C07C7/00C07C7/163C07C7/04C07C7/10C07C15/04
CPCC07C7/005C07C7/04C07C7/10C07C7/163C07C15/04Y02P20/129
Inventor 陶凌云徐艳群周良军
Owner 武汉聚川科技有限公司
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