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Crude benzene hydrogenation method

A technology of crude benzene and hydrogenation catalyst, which is applied in the direction of hydrogenation treatment process, chemical instruments and methods, hydrocarbons, etc., and can solve the problems of ineffective utilization of heavy components, increased investment and energy consumption, and reduced added value of crude benzene, etc. problem, achieve the effects of accelerating the diffusion rate and contact area, inhibiting coke formation, and strong solubility

Active Publication Date: 2012-01-18
HUNAN CHANGLING PETROCHEM SCI & TECH DEV CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this method can effectively avoid the coking problem of the device, the valuable heavy components in the crude benzene have not been effectively utilized, and the added value of the crude benzene is greatly reduced; in order to further suppress the coking of the crude benzene and meet the product property requirements, two or three stages are adopted Reactor reaction, the hydrogenation reaction is mainly in the gas phase, and the gas-oil ratio is high, so a large amount of hydrogen needs to be circulated, and the loss of hydrogen increases
In addition, the operation of pretreatment equipment, multiple reactors and recycle hydrogen compressors increases investment and energy consumption

Method used

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  • Crude benzene hydrogenation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] A raw material of crude benzene, whose properties are shown in Table 2. The reaction conditions of full liquid phase hydrogenation: reaction temperature 320°C, reaction pressure 7.0MPa, reflux circulation volume of hydrogenation product 80%, reaction liquid hourly space velocity 1.0h -1 . See Table 3 for the pressure drop in the reactor during hydrogenation and the properties of the hydrogenation product.

[0037] Table 2

[0038] project value project value Density, Kg / m 3 881.7 Family Composition m% Total S, ppm 3006 Alkanes 1.67 Total N, ppm 2162 Naphthenic 1.66 Bromine value, gBr 2 / 100g 6.09 Alkenes 0.15 Aromatics 96.52

[0039] table 3

[0040]

[0041] It can be seen from Table 3 that the hydrogenation product obtained by the present invention effectively removes sulfur and nitrogen impurities in the raw material, the loss rate of light aromatics is 0.3-0.4%, the total sulfur is 0.3-0....

Embodiment 2

[0043] A raw material of crude benzene, whose properties are shown in Table 4, the reaction conditions of full liquid phase hydrogenation: reaction temperature 331°C, reaction pressure 5.5MPa, reflux circulation volume of hydrogenation product 70%, reaction liquid hourly space velocity 2.0h -1 . See Table 5 for the pressure drop in the reactor during hydrogenation and the properties of the hydrogenation product.

[0044] Table 4

[0045] project value project value Density, Kg / m 3 882.1 Family Composition m% Total S, ppm 4525 Alkanes 2.12 Total N, ppm 2562 Naphthenic 1.98 Bromine value, gBr 2 / 100g 7.17 Alkenes 0.21 Aromatics 95.69

[0046] table 5

[0047]

[0048] It can be seen from Table 5 that the hydrogenation product obtained by the present invention effectively removes sulfur and nitrogen impurities in the raw material, the loss rate of light aromatics is 0.3-0.4%, the total sulfur is 04-0....

Embodiment 3

[0050] A raw material of crude benzene, whose properties are shown in Table 6. The reaction conditions of full liquid phase hydrogenation: reaction temperature 345°C, reaction pressure 4.0MPa, reflux circulation volume of hydrogenation product 60%, reaction liquid hourly space velocity 4.0h -1 . See Table 7 for the hydrogenation operation time reactor pressure drop and the properties of the hydrogenation product.

[0051] Table 6

[0052] project value project value Density, Kg / m 3 882.2 Family Composition m% Total S, ppm 5562 Alkanes 2.56 Total N, ppm 1963 Naphthenic 2.01 Bromine value, gBr 2 / 100g 5.85 Alkenes 0.24 Aromatics 95.19

[0053] Table 7

[0054]

[0055] It can be seen from Table 3 that the hydrogenation product obtained by the present invention effectively removes sulfur and nitrogen impurities in the raw material, the loss rate of light aromatics is 0.3-0.5%, the total sulfur is 0.5-0....

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Abstract

The invention discloses a crude benzene hydrogenation method, which comprises the steps that: crude benzene full-fractional raw materials, hydrogen and cyclic products generated through hydrogenation are fully mixed in a hydrogen mixing tank so that the hydrogen is dissolved in hydrogenation raw materials to the maximum degree; then, the crude benzene full-fractional hydrogenation raw materials with rich dissolved hydrogen enter one section of hydrogenation reactor in a full liquid phase form; and in addition, the whole hydrogenation reaction is carried out under the full liquid phase condition through controlling the pressure of a system. After the crude benzene hydrogenation method is adopted, the coking problem in the crude benzene hydrogenation process can be perfectly solved, the long-term operation of a crude benzene hydrogenation device is realized, the crude benzene full-fractional hydrogenation refining can also be realized, crude benzene is completely converted into important chemical products such as clean benzene, toluene, dimethylbenzene and the like, and the comprehensive utilization value of the crude benzene is improved. In addition, the hydrogenation reaction in the method is liquid phase reaction, the hydrogen circulation process and the adoption of a hydrogen circulation compressor are not needed, in addition, the raw material pretreatment link is omitted, and simultaneously, one section of hydrogenation reactor is used, so the energy consumption and the investment can be effectively reduced.

Description

technical field [0001] The invention relates to the effective utilization of crude benzene, a by-product of coal coking, in particular to a method for hydrotreating the whole fraction of crude benzene. Background technique [0002] Crude benzene is a complex mixture composed of various aromatic hydrocarbons and other compounds, of which benzene, toluene, and xylene content account for more than 90%, and important chemical products such as benzene, toluene, and xylene can be obtained through refining. [0003] Crude benzene is mainly refined by pickling and hydrotreating. The pickling method has simple process flow, flexible operation and low equipment investment, but serious pollution, low product yield and poor quality; hydrofining method has low pollution, high product yield and high quality, but the process process is more complicated and the investment is larger , is the current mainstream crude benzene refining technology. [0004] CN101967078A discloses a crude benze...

Claims

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Application Information

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IPC IPC(8): C07C7/163C07C15/04C07C15/06C07C15/08C10G67/02
Inventor 佘喜春朱方明郭朝晖曾志煜郭庆明
Owner HUNAN CHANGLING PETROCHEM SCI & TECH DEV CO LTD
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