Method of double solvents, benzene substitutive rectification for separating c9 aromatics

A carbon 9 aromatics, extractive distillation column technology, applied in extraction purification/separation, organic chemistry and other directions, can solve the problems of large reflux ratio, excessive number of trays, large energy consumption, etc., to reduce equipment production load, strengthen Separation effect, effect of improving production efficiency

Active Publication Date: 2007-05-09
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There are obvious deficiencies in US 3220933: the dimethyl phthalate extraction and rectification technology separates the number of plates of mesitylene too much, the reflux ratio is too large, and the energy consumption is also large

Method used

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  • Method of double solvents, benzene substitutive rectification for separating c9 aromatics
  • Method of double solvents, benzene substitutive rectification for separating c9 aromatics

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0038] According to the flow chart in Figure 1, use platinum reforming tower bottom oil as raw material, and obtain mesitylene-o-methylethylbenzene enrichment liquid through precision rectification, use triethyl glycerol as the high boiling point solvent, and diethyl carbonate as the low boiling point Solvent, cooperative extraction and rectification to obtain high-purity trimethylbenzene, o-methylethylbenzene and mesitylene products. The main operating conditions are shown in Table 1, and the composition of raw materials and main products is shown in Table 2. The dosage ratio of high boiling point solvent and low boiling point solvent is shown in Table 3.

[0039] Device No

[0040] Pipeline number

[0041] Material name

example 2

[0043] According to the flow process of Figure 2, hydroxyethyl acrylate is selected as the extraction agent, and the extraction and rectification obtains the mesitylene-o-methylethylbenzene enrichment solution. Other conditions are exactly the same as in Example 1. The main operating conditions are shown in Table 4, and the main product composition See Table 5, and see Table 6 for the dosage ratio of extractant, high boiling point solvent, and low boiling point solvent.

[0044] Device No

[0045] 210, 211, 212 operating conditions are the same as 108, 109, 110.

[0046] Pipeline number

[0047] Material name

example 3

[0049] According to the flow process of Fig. 1, with the material of example 1 as raw material, precision rectification obtains mesitylene-o-methylethylbenzene enrichment liquid, with dimethyl phthalate as high boiling point solvent, diethyl carbonate as low Boiling point solvent, cooperative extraction and rectification to obtain high-purity mesitylene, o-methylethylbenzene and mesitylene products. When the high boiling point solvent changes, the result of its extractive distillation also changes; Now replace the triethylglyceride in the example 1 with dimethyl phthalate, in order to reach the same separation result, the required number of plates and The temperature of the tower still has a certain increase; its main operating conditions are shown in Table 7, and the composition of raw materials and main products is shown in Table 8. See Table 9 for the dosage ratio of high boiling point solvent and low boiling point solvent.

[0050] Device No

[0051] ...

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Abstract

This invention discloses a method for separating C9 aromatic hydrocarbons by double-solvent extraction and rectification. The method comprises: (1) pre-fractionating C9 aromatic hydrocarbon mixture, and collecting the rich fraction containing mesitylene and o-methyl ethyl benzene; (2) introducing the rich fraction into the middle of a double-solvent extraction-rectification column, introducing high-boiling-point solvent from the top of the column and low-boiling-point solvent from the bottom of the column, and extracting to obtain mixed fractions containing mesitylene and the low-boiling-point solvent at the top of the column and mixed fractions containing o-methyl ethyl benzene and the high-boiling-point solvent at the bottom of the column; (3) separating the mixed fractions in a solvent recovery column to obtain mesitylene and o-methyl ethyl benzene products, discharging, and recycling the solvents. The method significantly expands the relative volatility between trimethyl benzene and o-methyl ethyl benzene by using high-boiling-point and low-boiling-point solvents.

Description

technical field [0001] The present invention relates to the improvement of the process method for separating C9 aromatics, in particular to the improvement of the process method for separating the system containing mesitylene and o-methylethylbenzene. 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 C9 aromatics by-products in different chemical processes is different, but its basic components such as mesitylene, mesitylene, methylethylbenzene, etc. are important chemical resources. The separation and utilization of the increasing fraction of C9 aromatics has far-reaching significance for improving the economic benefits of related devices and comprehensively utilizing petroleum resources. [0003] Since the boiling points of the components in the mixture of carbon and nine aromatic hydrocarbons are very close, especially the difference b...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C7/10C07C15/02
Inventor 傅吉全戴伟冯海强殷立峰胡竞民杨志钢
Owner CHINA PETROLEUM & CHEM CORP
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