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Method for separating 2,4-dichlorotoluene from dichlorotoluene mixed solution

A dichlorotoluene and separation method technology, applied in chemical instruments and methods, distillation purification/separation, hydrocarbon purification/separation, etc., can solve the problems of low value, low purity and high cost of 2,4-dichlorotoluene, Achieve the effects of cheap production, increased added value, and simple production process

Pending Publication Date: 2021-08-24
江苏超跃化学有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Aiming at the problems of low comprehensive utilization value, high cost and low purity of 2,4-dichlorotoluene existing in the prior art, the present invention provides a method for separating 2,4-dichlorotoluene from a mixed solution of dichlorotoluene. -The method of dichlorotoluene, which uses N-n-butylpyrrolidone as an extractant to separate high-purity 2,4-dichlorotoluene from mixed dichlorotoluene by extractive distillation

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] (1) Weight removal: send the mixed dichlorotoluene into a rectification tower with a theoretical plate number of 140 for weight removal. The ratio is 3; the content of the mixed dichlorotoluene before the weight removal, the rectification and the tower bottom components is analyzed by GC, and the analysis results are shown in Table 1 below;

[0022] Table 1 Analysis table of mixed dichlorotoluene components before and after deweighting

[0023] ;

[0024] (2) Extraction and rectification: N-n-butylpyrrolidone is used as the extraction agent, and the mixed dichlorotoluene after deweighting is sent to the extractive distillation tower for extraction and rectification, and 2,5-dichlorotoluene is extracted from the top of the tower (the content of 2,5-dichlorotoluene is 97.99%), the mixture of 2,4-dichlorotoluene and extractant is extracted from the tower reactor; the theoretical plate number of the above-mentioned extractive distillation tower is 100, and after The fee...

Embodiment 2

[0030] (1) Weight removal: send the mixed dichlorotoluene into a rectification tower with a theoretical plate number of 120 to remove weight. The ratio is 6; the content of mixed dichlorotoluene before the weight removal, the rectification and the tower bottom components is analyzed by GC, and the analysis results are shown in Table 3 below;

[0031] Table 3 Analysis table of mixed dichlorotoluene components before and after deweighting

[0032] ;

[0033] (2) Extraction and rectification: N-n-butylpyrrolidone is used as the extraction agent, and the mixed dichlorotoluene after deweighting is sent to the extractive distillation tower for extraction and rectification, and 2,5-dichlorotoluene is extracted from the top of the tower (the content of 2,5-dichlorotoluene is 97.90%), the mixture of 2,4-dichlorotoluene and extractant is extracted from the tower reactor; the theoretical plate number of the above-mentioned extractive distillation tower is 100, and after The feed posi...

Embodiment 3

[0039] (1) Weight removal: send the mixed dichlorotoluene into a rectification tower with a theoretical plate number of 130 to remove weight. The ratio is 4; the content of the mixed dichlorotoluene before the weight removal, the rectification and the tower bottom components is analyzed by GC, and the analysis results are shown in Table 5 below;

[0040] Table 5 Analysis table of mixed dichlorotoluene components before and after deweighting

[0041] ;

[0042] (2) Extraction and rectification: N-n-butylpyrrolidone is used as the extraction agent, and the mixed dichlorotoluene after deweighting is sent to the extractive distillation tower for extraction and rectification, and 2,5-dichlorotoluene is extracted from the top of the tower (the content of 2,5-dichlorotoluene is 97.60%), the mixture of 2,4-dichlorotoluene and extractant is extracted from the tower reactor; the theoretical plate number of the rectification tower is 100, the extractant and the deweighted The feed po...

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Abstract

The invention discloses a method for separating 2,4-dichlorotoluene from a dichlorotoluene mixed solution, which comprises the following steps: carrying out heavy component removal on the mixed dichlorotoluene in a rectifying tower to remove a heavy component 2,3-dichlorotoluene; with N-n-butyl pyrrolidone as an extraction agent, carrying out rectification extraction on the heavy-removed mixed dichlorotoluene in an extractive distillation tower, extracting a mixture of 2,4-dichlorotoluene and the extraction agent from a tower kettle, feeding the mixture of 2,4-dichlorotoluene and the extraction agent into a desorption tower for desorption, and extracting 2,4-dichlorotoluene from the tower top. According to the method, the N-n-butyl pyrrolidone is used as the extracting agent, the mixed dichlorotoluene raw material is treated through the extractive distillation process, the 2,4-dichlorotoluene product with the content of 99.5% or above is produced, low-cost production of the product is achieved, the added value of the mixed dichlorotoluene serving as the solvent is remarkably increased, the production process is simple, the production cost has obvious advantages, and the process is suitable for continuous production of industrial devices.

Description

technical field [0001] The invention belongs to the technical field of organic synthesis and separation, and in particular relates to a method for separating 2,4-dichlorotoluene from dichlorotoluene mixed liquid. Background technique [0002] In the process of producing p-chlorotoluene, o-chlorotoluene and 2,6-dichlorotoluene from toluene and chlorine by catalytic or thermal chlorination, 2,4-dichlorotoluene and 2,5-dichlorotoluene are usually produced Mixed dichlorotoluene by-products, this part of mixed dichlorotoluene by-products generally account for about 17% of the main product output of the production device, and currently this part of mixed dichlorotoluene is often used as solvent oil (low utilization value), this part of by-products The low-value utilization significantly increases the production cost of the toluene chlorination production unit, resulting in a great waste of resources. [0003] Since the boiling points of 2,5-dichlorotoluene and 2,4-dichlorotoluene...

Claims

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Application Information

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IPC IPC(8): C07C7/08C07C7/00C07C25/02
CPCC07C7/005C07C7/08
Inventor 任坚跃徐泽辉殷云武
Owner 江苏超跃化学有限公司
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