Coked crude benzene refining method

A technology for coking crude benzene and a refining method, which is applied in chemical instruments and methods, organic chemistry, hydrocarbons, etc., can solve problems such as methods that have not yet been perfected and xylene fractions have not been sufficiently refined, and achieves environmental protection and processing. The effect of cost reduction and equipment investment reduction

Inactive Publication Date: 2011-04-06
TAIYUAN QIAOYOU CHEM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Through the above refining method, high-quality benzene can be obtained from coking crude benzene, and thiophene can also be recovered at the same time. The disadvantage is that the toluene and xylene fractions accounting for 15-18% of crude benzene have not been fully refined, and the coking crude benzene is refined. The method is yet to be perfected for the recovery of the most valuable triphenyls

Method used

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  • Coked crude benzene refining method
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  • Coked crude benzene refining method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] 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.

[0035] 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

[0037] 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 compound 1.5%, coumarone and other oxygen-containing compounds 1.1%), carry out hydrogenation refining, the process conditions are: the pre-hydrogenation reactor is filled with commercially available Ni-Mo catalyst, the reactor inlet temperature is 190 ° C, and the pressure is 3.2 MPa 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 prod...

Embodiment 3

[0039] Using the nitration-grade toluene obtained in Example 2 as raw material, the high-purity toluene product is obtained through the secondary extraction tower and the toluene refining tower. The process parameters are: 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 coked crude benzene refining method, including crude benzene pre-treatment, benzene fraction extractive distillation and methyl benzene, dimethyl benzene fraction hydrorefining. The invention has the advantages that products with high purity and high quality of benzene, methyl benzene and / or methyl benzene and thiophene can be obtained, equipment investment is reduced greatly, processing cost is also greatly reduce, no environmental pollution is produced, and product ratio can be regulated according to market requirement.

Description

[0001] This application is a divisional application of the patent application with the application number 200710000044.4, the application date is January 8, 2007, and the invention title is the method for refining coking crude benzene. [0002] 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 [0003] 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. Se...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C15/04C07C15/08C07C15/06C07C7/04C07C7/10C07C7/163C07C6/12C07D333/10
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 TAIYUAN QIAOYOU CHEM IND
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