Hydrofinishing method for crude benzol

A technology for hydrofining and crude benzene, which is applied in the fields of refined hydrocarbon oil, chemical instruments and methods, and hydrocarbons, and can solve problems such as high investment and operating costs, easy blockage, and large loss of aromatic compounds

Inactive Publication Date: 2009-07-22
胜帮科技股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0002] The refining of coking crude benzene (mixed aromatics) was first carried out by pickling, which can only partially remove sulfur-containing compounds (mainly thiophene) and other impurities in crude benzene, and the loss of aromatic compounds in the process is relatively large (about 8% to 10%), its by-product waste acid tar and residues have no effective treatment methods, causing environmental pollution
With the rapid development of the organic chemical industry, the quality requirements for benzene series aromatic products are very high, and the aromatic products obtained by pickling can no longer meet the needs, and this method has long been eliminated in developed countries
[0003] In t...

Method used

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  • Hydrofinishing method for crude benzol
  • Hydrofinishing method for crude benzol
  • Hydrofinishing method for crude benzol

Examples

Experimental program
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Effect test

Embodiment 1

[0022] Such as figure 1 Shown is the schematic flow sheet that a preferred embodiment of the present invention proposes, and coking crude benzene raw material first enters decompression heavy-lifting tower 1, and in the raw material greater than C 9 The heavy components are removed by the decompression system, and the obtained light components are mixed with hydrogen 19 and then enter the multi-stage evaporation system 2; Adjust the heat exchange network in the system to control the cold washing temperature of the evaporation tower; the material flowing out from the lower part of the evaporation tower 3 will return, and the material flowing out from the upper part of the evaporation tower 3 will enter the pre-reactor 5 after taking heat; the pre-reactor 5 The product generated by the reaction is heated by the heating furnace 6 and then enters the main reactor 7; the product generated by the reaction of the material in the main reactor 7 passes through the hydrogenation product...

Embodiment 2-3

[0037] The properties of the coked crude benzene raw material used in Example 2-3 are shown in Table 1. The reaction conditions in this example are shown in Table 4 (Example 2 corresponds to Condition 2; Example 3 corresponds to Condition 3). All the other are with embodiment 1.

[0038] The properties of the processed product are shown in Table 5.

[0039] Table 4. Crude benzene hydrogenation process conditions

[0040]

[0041] Table 5. Properties of Crude Benzene Hydrogenation Products

[0042]

[0043]

[0044] Note: The hydrogenation of crude benzene is the hydrogenation of the whole distillate, and then the sulfur and nitrogen content of light benzene after cutting the real boiling point according to the dry point of 165°C

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Abstract

The invention relates to the production field of high purity benzene, toluene and mixed xylene, in particular to a method for treating a hydrorefining crude benzene. The method takes coking crude benzene as raw material, after pretreatment, heavy aromatics are removed directly through a vacuum and de-heavy tower with the pressure at the top of the tower between 0.01MPa and 0.1MPa; pre-hydrotreating reaction and main-hydrotreating reaction are carried out, gas phase material enters a high pressure flash drum after hydrotreating reaction, hydrogen-rich gases are separated, liquid phase material enters a stabilizer and low boiling point hydrocarbon is removed; liquid phase material removed from the low boiling point hydrocarbon enters an aromatics extraction device and high purity benzene, toluene and mixed xylene are obtained through extraction. Under the premise of guaranteeing the yield of benzene, toluene and mixed xylene, the method not only effectively reduces investment cost and the operation cost of devices, but also has the advantages of good product quality, long device running cycle, etc.

Description

technical field [0001] The present invention relates to the production field of high-purity benzene, toluene and mixed xylene; in particular, it relates to a treatment method for hydrogenation of crude benzene, that is, using crude benzene as a raw material, through hydrogenation treatment and extraction of aromatics widely used in the field of petroleum processing, etc. Method to produce high-purity benzene, toluene and mixed xylene products (hereinafter referred to as "triphenyl"). Background technique [0002] The refining of coking crude benzene (mixed aromatics) was first carried out by pickling, which can only partially remove sulfur-containing compounds (mainly thiophene) and other impurities in crude benzene, and the loss of aromatic compounds in the process is relatively large (about 8% to 10%), and its by-product waste acid tar and residues have no effective treatment methods, causing environmental pollution. With the rapid development of the organic chemical indu...

Claims

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Application Information

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IPC IPC(8): C07C7/163C07C15/02C10G45/08C10G45/12
Inventor 沈和平
Owner 胜帮科技股份有限公司
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