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Process for separating ethylbenzene from C8 arene

A C8 aromatic hydrocarbon and process technology, which is applied in the technical field of separating ethylbenzene, can solve the problems of complex production operation, harsh operating conditions, high price, etc., and achieves the effects of remarkable separation effect, reduction of the number of trays, and easy recovery.

Inactive Publication Date: 2015-03-04
NANJING UNIV OF TECH
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Problems solved by technology

The advantage of the precision distillation method is that the technology is mature, and the disadvantage is that the energy consumption is high
The adsorption separation method is divided into the technology of preferential adsorption of xylene isomers and the technology of preferential adsorption of ethylbenzene, which has the advantage of high product purity, but the disadvantage is that expensive special molecular sieves need to be used as adsorbents in production, and the production operation is complicated
In industry, the isomerization method is usually used to convert EB into xylene, but the conversion rate of EB in this method is low, a large number of by-products are generated, and the operating conditions are relatively harsh

Method used

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  • Process for separating ethylbenzene from C8 arene

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Such as figure 1 Shown: 40000kg / h of C8 aromatic hydrocarbon mixture material (containing ethylbenzene 6000kg / h, o-xylene 8000kg / h, m-xylene 18000kg / h, p-xylene 8000kg / h) enters the rectifying tower (B1), the tower The number of plates is 200, the reflux ratio is 8, 7920kg / h of o-xylene with a mass purity of 99.00% is obtained at the bottom of the tower, and the mixture of ethylbenzene, m-xylene and p-xylene at the top of the tower is 32080kg / h. Rectification tower (B1) overhead distillate enters extractive distillation tower (B2) separation, introduces extractant ethyl phenylacetate (32080kg / h) through mixer (B4) at extractive distillation tower (B2) simultaneously, the The number of trays is 255, the reflux ratio is 61, 5940kg / h of ethylbenzene with a mass purity of 99.23% is obtained at the top of the tower, and the mixture of ethyl phenylacetate, m-xylene and p-xylene at the bottom of the tower is 58220kg / h. The distillate at the bottom of the extractive distillati...

Embodiment 2

[0022] 50000kg / h of C8 aromatic hydrocarbon mixture material (containing ethylbenzene 7500kg / h, o-xylene 10000kg / h, m-xylene 22500kg / h, p-xylene 10000kg / h) enters the rectification column (B1), and the number of trays is 120 , reflux ratio 11, 9920kg / h quality purity is 99.20% o-xylene at the bottom of the tower, and 40080kg / h ethylbenzene, m-xylene, p-xylene mixture at the top of the tower. Rectification tower (B1) overhead distillate enters extractive rectification tower (B2) separation, introduces extraction agent methyl oleate (23358kg / h) at extractive rectification tower (B2) simultaneously, and this tower tray number 255, With a reflux ratio of 59, 7437kg / h of ethylbenzene with a mass purity of 99.12% is obtained at the top of the tower, and a mixture of 56001kg / h of propiophenone, m-xylene and p-xylene at the bottom of the tower. The distillate at the bottom of the extractive distillation tower (B2) enters the extractant recovery tower (B3). The number of plates in this...

Embodiment 3

[0024] 45000kg / h of C8 aromatic hydrocarbon mixture material (containing ethylbenzene 6750kg / h, ortho-xylene 9000kg / h, m-xylene 20250kg / h, p-xylene 9000kg / h) enters the rectifying tower (B1), and the number of trays in this tower 120, reflux ratio 13, 9000kg / h o-xylene with a mass purity of 99.49% can be obtained at the bottom of the tower, and 36000kg / h mixture of ethylbenzene, m-xylene and p-xylene at the top of the tower. The distillation column (B1) overhead distillate enters the extractive distillation column (B2) for separation, and introduces the extractant benzaldehyde (72000kg / h) in the extractive distillation column (B2) simultaneously, and the plate number of this column is 240, and the reflux ratio 65, 6691kg / h of ethylbenzene with a mass purity of 99.91% was obtained at the top of the tower, and 101309kg / h of benzaldehyde, m-xylene, and p-xylene mixture at the bottom of the tower. Extractive distillation tower (B2) tower bottom distillate enters extractant recover...

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Abstract

The invention discloses a process for separating ethylbenzene from C8 arene. The process comprises the following steps: separating a C8 arene mixture by virtue of a rectifying tower (B1) to obtain an o-xylene from the bottom of the tower, and separating a tower top distillate in an extraction rectifying tower (B2) to obtain ethylbenzene flowing out of the top of the extraction rectifying tower (B2); separating a tower bottom distillate in an extracting agent recovery tower (B3) to obtain a mixture of p-xylene and m-xylene from the top of the tower; and recycling an extracting agent from the bottom of the tower in the extraction rectifying tower (B2). Compared with a precise rectifying method, the process disclosed by the invention has the advantages that the number of tower plates is obviously reduced, the energy consumption is reduced, the separation effect is significant, the purity of ethylbenzene can reach more than 99%, and the extracting agent is easy to recover and can be recycled.

Description

technical field [0001] The invention relates to a chemical separation process, in particular to a process for separating ethylbenzene from C8 aromatics. Background technique [0002] Industrial mixed xylenes mainly come from catalytic reforming, steam cracking, toluene disproportionation and coal tar. Mixed xylenes are mainly used as blending components of solvents and gasoline, with low resource utilization and low added value. High-purity C8-aromatics are the main body of market demand for synthetic rubber, resins, and fine chemicals. [0003] As important chemical raw materials, p-xylene (PX) and o-xylene (OX) are mainly used to synthesize polyester and phthalic anhydride, and m-xylene (MX) is ammoxidized to produce isophthalonitrile, which is a synthetic special resin with high efficiency. As an important intermediate of low-toxic pesticides, fuels and plasticizers, ethylbenzene (EB) also has a wide range of uses, mainly for the production of styrene, and then the prod...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C15/073C07C15/08C07C7/08C07C7/04
Inventor 管国锋万辉万平
Owner NANJING UNIV OF TECH
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