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Rectification method for producing benzene and methylbenzene

A technology for the production of benzene and toluene, applied in distillation purification/separation, organic chemistry, etc., can solve the problems of large investment, high energy consumption, and long process flow of rectification and separation

Inactive Publication Date: 2016-05-18
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] What the present invention aims to solve is the technical problem of long rectification and separation process flow, large investment and high energy consumption when producing benzene and toluene in the prior art, and provides a rectification method for producing benzene and toluene, which has the advantages of short flow process , less investment, low energy consumption advantages

Method used

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  • Rectification method for producing benzene and methylbenzene
  • Rectification method for producing benzene and methylbenzene
  • Rectification method for producing benzene and methylbenzene

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] according to figure 1 In the process shown, the raw materials in Comparative Example 1 are used for separation, the total number of theoretical plates in the dividing wall rectification column is 60, the number of theoretical plates in the public rectification section is 20, and the number of theoretical plates in the dividing wall section is 25. The raw material enters from the 13th theoretical plate from the top to the bottom of the feed side I of the dividing wall section; the benzene product is extracted from the 8th theoretical plate from the top to the bottom of the public rectification section II; the toluene product is extracted from the dividing wall section The product side III is mined from the 15th theoretical board counted from top to bottom. The operating pressure of the dividing wall rectification column is 50KPa in terms of absolute pressure; the reflux ratio of the tower top in terms of raw material weight is 2.53; the liquid phase of the common rectifi...

Embodiment 2～5

[0025] according to figure 1 In the process shown, the raw materials in Comparative Example 1 were used to change part of the operating conditions of the dividing wall distillation column, including the total number of theoretical plates, the number of theoretical plates in the public rectification section, the number of theoretical plates in the dividing wall section, and the number of public stripping sections. Theoretical plate number, feed position of raw materials, reflux ratio, liquid phase distribution ratio of common rectification section entering both sides of dividing wall section, and gas phase distribution ratio of common stripping section entering both sides of dividing wall section. For ease of comparison, the operating conditions and separation results of the lower dividing wall rectification tower in each embodiment are also listed in Table 3.

[0026] Table 3 The separation results of Examples 1 to 5 of the present invention

[0027]

[0028]

Embodiment 6～7

[0030] according to figure 1 The flow process shown adopts the same raw materials as in Examples 4 and 5, and changes the reflux ratio of the dividing wall rectification column, and the results are listed in Table 4. It can be seen that when the reflux ratio is low, good separation effect can also be obtained, but compared with Examples 4 and 5, the quality of the separated benzene and toluene products is slightly lower than that of the high reflux ratio, especially the benzene , the product purity is lower than 99.9%; and when the reflux is relatively high, although the quality of the separated benzene and toluene products is high, compared with the traditional two-tower separation process, the energy saving is less, less than 10 %.

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Abstract

The invention relates to a rectification method for producing benzene and methylbenzene and mainly solves the technical problems of long rectification separation process, high investment and high energy consumption during production of the benzene and methylbenzene in the prior art. The rectification method includes the following steps: a raw material (101) containing the benzene and methylbenzene is fed into a material feeding side (I) of a wall-divided section of a dividing-wall rectifying column; separation is carried out to obtain a material flow (102) containing non-aromatic components from the top of a public rectifying section (II), a material flow (103) containing a benzene product from the upper part of the public rectifying section (II), a material flow (104) containing a methylbenzene product from a product side (III) of the wall-divided section, and a material flow (105) containing dimethylbenzene and other heavy components from the bottom of a public stripping section (IV). The technical scheme solves the problem well. The method can be used for industrially producing the benzene and methylbenzene.

Description

technical field [0001] The invention relates to a rectification method for the production of benzene and toluene, in particular to a rectification method that uses the feedstock of the benzene-toluene fractionation unit in the aromatics joint production unit as raw material to produce benzene and toluene products through rectification and save investment and energy Distillation method. Background technique [0002] Rectification is the most mature and widely used separation technology in petrochemical production, but the rectification process consumes a lot of energy. It is estimated that 40-70% of the energy consumption in the chemical process is used for separation, and rectification energy consumption accounts for 95% of them. In order to reduce the energy consumption of the rectification process, researchers at home and abroad have conducted extensive research, and have developed a variety of rectification energy-saving technologies, including intermediate heat exchange...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C7/04C07C15/04C07C15/06C07C15/08
Inventor 郭艳姿陈亮张鸿翔
Owner CHINA PETROLEUM & CHEM CORP
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