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Method for separating mixture of m-ethyltoluene and p-ethyltoluene from C9 aromatics

A technology of carbon 9 aromatics and p-toluene ethylbenzene, which is applied in the separation room and p-ethyl benzene mixture field, can solve the problems of low yield, high energy consumption and high reflux ratio, and achieves less investment, good compatibility, purity and yield. improved effect

Active Publication Date: 2012-04-04
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Due to the precision rectification method, the number of rectification tower plates required for separation is still large (≥120 pieces), the reflux ratio is high (≥35), the energy consumption is still quite high, the yield is low, and the product quality is poor

Method used

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  • Method for separating mixture of m-ethyltoluene and p-ethyltoluene from C9 aromatics
  • Method for separating mixture of m-ethyltoluene and p-ethyltoluene from C9 aromatics
  • Method for separating mixture of m-ethyltoluene and p-ethyltoluene from C9 aromatics

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Embodiment 1～6

[0041] The C9 C9 aromatic hydrocarbon mixture used in the embodiment of the present invention is a reformed C9 aromatic hydrocarbon fraction, which contains about 22.93% (weight) of m- and p-methylethylbenzene, and its specific components and contents are shown in Table 1.

[0042] Table 1 Composition and boiling point of C9 aromatics raw material

[0043] component name

Content (weight%)

Boiling point (°C)

p-xylene

0.30

138.4

Cumene

0.46

152.2

n-Propylbenzene

4.54

159.20

m-methylethylbenzene

16.80

161.33

p-ethylbenzene

6.13

162.01

mesitylene

6.81

164.74

o-methylethylbenzene

7.61

165.18

Trimethylbenzene

45.20

169.38

trimethylbenzene

12.15

176.08

[0044] Carry out the method for separating m- and p-methylethylbenzene from C9 aromatic hydrocarbons as described above. See Tables 2-4 for s...

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Abstract

The invention discloses a method for separating a mixture of m-ethyltoluene and p-ethyltoluene from C9 aromatics. The method comprises the following steps of: (1) mixing a C9 aromatics mixture and an accelerator, and sending into a heavy component eliminating tower, introducing a light component from the top of the tower, introducing a heavy component from a tower kettle; wherein the weight ratio of the C9 aromatics mixture to the accelerator is 1:0.05-0.5; (2) sending the light component from the step (1) into a light component eliminating tower, introducing the mixture of m-ethyltoluene and p-ethyltoluene from the tower kettle; (3) sending material flow introduced from the light component eliminating tower in the step (2) to an accelerator removal tower, introducing the accelerator from the tower top, introducing the material flow containing normal propylbenzene and isopropylbenzene from the tower kettle. The accelerator is acetonitrile and propionitrile. The mixture of m-ethyltoluene and p-ethyltoluene obtained by the method of the invention has the advantages of high purity, high yield and obvious separation effect.

Description

technical field [0001] The invention relates to the field of organic chemistry, and furthermore, relates to a method for separating m- and p-methylethylbenzene mixtures from carbon-nine aromatic hydrocarbons. Background technique [0002] The development of C9 aromatics deep processing technology and the utilization of various components have always been a concern of people. The composition of the by-product C9 aromatic fractions in different chemical processes is different, and its basic components, such as mesitylene, mesitylene, methylethylbenzene, etc., are important chemical resources. Methylbenzene contains three isomers of ortho, meta and p, and has a relatively high proportion in the C9 aromatic hydrocarbon mixture, especially in the reformed C9 aromatic hydrocarbon fraction, which can account for 25%-30%. Since the boiling point difference between m-methylethylbenzene and p-methylethylbenzene is only 0.7°C, it is difficult to completely separate them at one time, s...

Claims

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Application Information

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IPC IPC(8): C07C15/02C07C7/05
CPCY02P20/52
Inventor 冯海强高继东朱跃辉胡競民鲁耘
Owner CHINA PETROLEUM & CHEM CORP
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