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Method for refining carbonization crude benzole

A technology for coking crude benzene and a refining method, which is applied in the directions of organic chemistry, distillation purification/separation, etc., can solve the problems of high processing cost, low benzene recovery rate, large equipment investment, etc., and achieves reduction in processing cost, process environmental protection, and equipment investment. reduced effect

Active Publication Date: 2008-07-16
山西侨友化工股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The pickling method is relatively mature, but its purification depth is not enough, and the recovery rate of benzene is low. Its fatal disadvantage is that many high-boiling sulfides and acidic polymers that are very harmful to the environment and difficult to handle are produced in the process, as well as a large amount of waste sulfuric acid that is difficult to use. Seriously pollute the environment; hydrogenation method can obtain high-quality benzene or benzene products, but its disadvantages are large equipment investment and high processing cost. During the hydrogenation process, some useful components in crude benzene, such as thiophene, are decomposed to form sulfide Hydrogen cannot be recycled
The environmental-friendly coking crude benzene refining method (CN1686977A) adopts the process of extractive distillation to obtain high-quality benzene and recycle thiophene at the same time. The disadvantage is that the toluene and xylene fractions accounting for 15-18% of crude benzene have not been fully recovered. Refining, as far as coking crude benzene is refined and recovered the most valuable triphenyl process, this method has yet to be perfected

Method used

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  • Method for refining carbonization crude benzole
  • Method for refining carbonization crude benzole
  • Method for refining carbonization crude benzole

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Using crude benzene, a by-product of coal coke factory, as raw material (which contains 69.1% benzene, 14.6% toluene, 3.6% xylene, 0.577% thiophene, etc.) to remove light components (hydrogen sulfide, carbon disulfide, cyclopentadiene, etc.) ), then enter the benzene blowing tower; remove heavy components (naphthalene, coumarone, indene, etc.) The narrow benzene fraction containing thiophene (98% of which is benzene content) is distilled from the top of the tower, and enters the benzene extraction tower of the benzene fraction extraction and refining unit, while the toluene and xylene fractions discharged from the tower bottom are used as raw materials for the hydrorefining process and enter the pre-hydrogenation process reactor. The above-mentioned pretreatment unit operations are general distillation operations.

[0033] The narrow benzene fraction from the narrow benzene tower enters the benzene extraction tower. At the top of the benzene extraction tower, alkanes a...

Embodiment 2

[0035] Toluene and xylene fractions obtained in Example 1 are used as raw materials (71.5% of toluene, 15% of xylene, 2% of trimethylbenzene, 5% of unsaturated substances such as styrene, 0.7% of sulfides such as methylthiophene, and pyridines containing Nitrogen compounds 1.5%, coumarone and other oxygen-containing compounds 1.1%), carry out hydrogenation refining, the process conditions are: pre-hydrogenation reactor filled with commercially available Ni-Mo catalyst, reactor inlet temperature 190 ° C, pressure 3.2MPa The catalytic hydrogenation main reactor is filled with commercially available Co-Mo catalyst, the reactor inlet temperature is 320°C, and the pressure is 3.0MPa; 9 After the fractionation, the toluene fraction obtained enters the toluene primary extraction tower, the extractant is commercially available N-formyl morpholine, the tower top temperature is 98 ° C, the pressure is normal pressure, and the solvent ratio is 6. The obtained product is nitration grade to...

Embodiment 3

[0037] Using the nitration-grade toluene obtained in Example 2 as a raw material, the high-purity toluene product is obtained through the secondary extraction tower and the toluene refining tower. The process parameters are as follows: the extraction agent is N-formyl morpholine, and the temperature at the top of the secondary extraction tower is 98°C , the pressure is normal pressure, the solvent ratio is 5, the total sulfur content in high-purity toluene is less than 1ppm, the non-aromatic content is less than 1.0%, and there is no benzene and C 9 , Distillation scope<0.6 ℃ (comprising 110.6 ℃), others are the same as embodiment 2.

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Abstract

The invention relates to a method for refining coking benzol, consisting of a process of benzol pretreatment and benzene extractive distillation, a hydrofining process of toluol, xylene distillation and a toluene disproportionation process. The invention has the advantages of that high-purity and high-quality product of the benzene, toluol and / or thiophen can be obtained; device investment is reduced by times; processing cost is also greatly reduced without environmental pollution; product proportion can be regulated according to market requirement.

Description

[0001] The invention belongs to a method for refining coking crude benzene, in particular to a method for obtaining high-quality benzene, toluene and / or xylene and thiophene. Background technique [0002] At present, there are two industrial methods for refining coking crude benzene (abbreviated as crude benzene): one is pickling method, and the other is hydrogenation method. The pickling method is relatively mature, but its purification depth is not enough, and the recovery rate of benzene is low. Its fatal disadvantage is that many high-boiling sulfides and acidic polymers that are very harmful to the environment and difficult to handle are produced in the process, as well as a large amount of waste sulfuric acid that is difficult to use. Seriously pollute the environment; hydrogenation method can obtain high-quality benzene or benzene products, but its disadvantages are large equipment investment and high processing cost. During the hydrogenation process, some useful compone...

Claims

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Application Information

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IPC IPC(8): C07C7/04C07C7/08C07C15/04
Inventor 石俊来曾爱武宋旗跃袁鉴清白玉祥张顺义黄哲张承华
Owner 山西侨友化工股份有限公司
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