Method for separating mesitylene via extractive distillation

A technology of extractive distillation and mesitylene, applied in the direction of distillation purification/separation, organic chemistry, etc., can solve the problem of low separation efficiency of mesitylene and o-methylethylbenzene, one-time investment and complicated process, and energy consumption of the separation process Increase and other problems, to achieve the effect of increased yield, reduced dosage, and high separation efficiency

Active Publication Date: 2013-05-29
CHINA PETROLEUM & CHEM CORP +1
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Problems solved by technology

There are disadvantages of one-time equipment investment and relatively complicated process
In addition, due to the low boiling point solvent and mesitylene and discharge from the top of the tower, the energy consumption of the separation process increases
[0007] Chinese patent CN1513818A has reported a kind of rectification and extraction interleaving combination separation C 9 The process uses N-formylmorpholine as the solvent for extraction and rectification. In the overhead distillate, the content of mesitylene can reach more than 98.5%. Low, the number of theoretical plates N of the extractive distillation tower is as high as 123, and the yield of mesitylene is only 84%

Method used

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  • Method for separating mesitylene via extractive distillation
  • Method for separating mesitylene via extractive distillation
  • Method for separating mesitylene via extractive distillation

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Embodiment

[0032] Such as figure 1 As shown, the C9 aromatics mixture 1 after removing the light components enters the middle and lower part of the mesitylene tower T1, and the enriched fraction 2 containing mesitylene and partial methyl ethylbenzene is discharged from the top of the tower, and the tower bottom draws mainly containing mesitylene The stream 3 of mesitylene; the enriched fraction 2 containing mesitylene and part methyl ethylbenzene flowing out from the top of T1 enters the middle and lower part of the extractive distillation tower T2, and the circulating solvent 7 enters the extractive distillation tower T2 from the top, and passes through Extraction and rectification separation, mesitylene 4 is distilled from the top of the tower, and the stream 5 mainly containing o-methylethylbenzene and solvent is discharged from the bottom of the tower; the stream 5 mainly containing o-methylethylbenzene and solvent discharged from the T2 tower kettle is introduced into the solvent rec...

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Abstract

The invention discloses a method for separating mesitylene via extractive distillation, wherein an extractive distillation solvent adopted in the method is one of N-methyl-2-pyrrolidone and 2-pyrrolidone, and preferably is N-methyl-2-pyrrolidone. The method disclosed by the invention has the advantages of being relatively simple in separation process, low in operating energy consumption, and high in product yield. The extractive distillation solvent adopted in the method is high in separation efficiency for mesitylene and o-methyl-ethylbenzene, so that the separation process can be realized on an extractive distillation tower with few tower plates; and moreover, the solvent is easy to recover and good in chemical thermostability.

Description

technical field [0001] The invention relates to the field of chemical industry, and more particularly relates to a method for separating mesitylene by extraction and rectification. Background technique [0002] Mesitylene is a valuable fine chemical raw material. After nitration and hydrogenation reduction, mesitidine is produced, and then condensed and sulfonated with 1,4 dihydroxyanthraquinone to generate weakly acidic purayan blue RAW; The first kind of dye is mesitylene through sulfonation, nitration and reduction to make 2,4-diamino-mesitylene-6-sulfonic acid, and then condensed with bromic acid to form a blue base, and then reacted with ethoxy dichloro The reaction of s-triazine produces reactive brilliant blue K-3R and RAN, which are used for printing and padding; in addition, condensed s-trimethylaniline and α-methyl chloropropionate can be made into a wheat field herbicide and formulated as a 20% solution use. In addition, using mesitylene as raw material can be u...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C15/02C07C7/08
Inventor 冯海强朱跃辉高继东赵开径鲁耘
Owner CHINA PETROLEUM & CHEM CORP
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