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Method for separating methyl tert-butyl ether and dichloromethane by adding salt, extracting and rectifying

A technology of methyl tertiary butyl ether and dichloromethane, which is applied in the field of salt addition, extraction and distillation to separate methyl tertiary butyl ether and dichloromethane, can solve problems such as difficulty in separation and purification, and achieve low loss and low investment. , the effect of low energy consumption

Inactive Publication Date: 2016-02-10
NANTONG UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the small difference in boiling points between methyl tert-butyl ether and dichloromethane at normal pressure, it is a highly non-ideal system, and it is difficult to separate and refine the two by ordinary distillation.

Method used

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  • Method for separating methyl tert-butyl ether and dichloromethane by adding salt, extracting and rectifying
  • Method for separating methyl tert-butyl ether and dichloromethane by adding salt, extracting and rectifying

Examples

Experimental program
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Effect test

Embodiment 1

[0020] The processing capacity of the mixed liquid raw material (stream 1) of methyl tert-butyl ether and dichloromethane is 1000kg / h, and its composition is 71.2wt% methyl tert-butyl ether, 28.8wt% dichloromethane, the treatment process like figure 1 As shown, the experimental equipment of extractive distillation column is as follows figure 2 shown.

[0021] The composite extractant is composed of inorganic salt and polyethylene glycol, and the mass content of potassium chloride in the composite extractant (stream 2) is 3%; the mass ratio of the raw material to the composite extractant is 1:1.5.

[0022] The internal parts of the extractive distillation tower adopt 3×3θ ring stainless steel packing, the number of theoretical plates is 50, and the diameter of the tower is 50mm. The operating pressure at the top of the tower is normal pressure, the temperature at the top of the tower is 37.1-41.1°C, the temperature at the bottom of the tower is 56.3-57.5, and the reflux rati...

Embodiment 2

[0025] The processing capacity of the mixed liquid raw material (stream 1) of methyl tert-butyl ether and dichloromethane is 1000kg / h, and its composition is 68.7wt% methyl tert-butyl ether, 31.3wt% dichloromethane, the treatment process like figure 1 As shown, the experimental equipment of extractive distillation column is as follows figure 2 shown.

[0026] The composite extractant is composed of inorganic salt and polyethylene glycol, and the mass content of sodium chloride in the composite extractant (stream 2) is 2.5%; the mass ratio of the raw material to the composite extractant is 1:1.

[0027] The internal parts of the extractive distillation tower adopt 3×3θ ring stainless steel packing, the number of theoretical plates is 40, and the diameter of the tower is 50mm. The operating pressure at the top of the tower is normal pressure, the temperature at the top of the tower is 37.1-38.4°C, the temperature at the bottom of the tower is 56.7-58.1, and the reflux ratio a...

Embodiment 3

[0030] The processing capacity of the mixed liquid raw material (stream 1) of methyl tert-butyl ether and dichloromethane is 1000kg / h, and its composition is 74.8wt% methyl tert-butyl ether, 25.2wt% dichloromethane, the treatment process like figure 1 As shown, the experimental equipment of extractive distillation column is as follows figure 2 shown.

[0031] The composite extractant is composed of inorganic salt and polyethylene glycol, and the mass content of sodium nitrate in the composite extractant (stream 2) is 4%; the mass ratio of raw material to composite extractant is 1:1.2.

[0032]The internal parts of the extractive distillation tower adopt 3×3θ ring stainless steel packing, the number of theoretical plates is 55, and the tower diameter is 50mm. The operating pressure at the top of the tower is normal pressure, the temperature at the top of the tower is 36.8-37.6°C, the temperature at the bottom of the tower is 56.7-58.1, and the reflux ratio at the top of the ...

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Abstract

The invention discloses a method for separating methyl tert-butyl ether and dichloromethane through extractive distillation with salt. The method comprises the following steps: adding a mixed liquor raw material of methyl tert-butyl ether and dichloromethane and a composite extracting agent into an extractive distillation tower; carrying out extractive distillation and separation so as to obtain dichloromethane at the top of the tower and a mixture of methyl tert-butyl ether, the composite extracting agent and a trace amount of dichloromethane in the tower at the bottom of the tower; treating the mixture of methyl tert-butyl ether, the composite extracting agent and the trace amount of dichloromethane with a solvent recovery tower, allowing the trace amount of dichloromethane to be removed from the solvent recovery tower and to be distilled from the top of the solvent recovery tower and delivering the distilled trace amount of dichloromethane to the extractive distillation tower for cyclic separation; extracting methyl tert-butyl ether from the side at the upper part of the solvent recovery tower; and extracting the composite extracting agent from the bottom of the extractive distillation tower. The method provided by the invention can effectively separate methyl tert-butyl ether and dichloromethane; and after separation, dichloromethane with mass content of no less than 99.88% and methyl tert-butyl ether with mass content of no less than 99.50% are obtained.

Description

technical field [0001] The invention relates to a chemical separation technology, in particular to a method for separating methyl tert-butyl ether and methylene chloride by adding salt, extracting and rectifying. Background technique [0002] Methyl tert-butyl ether is abbreviated as MTBE, which is widely used in chemical and biological fields. MTBE has a high octane number and can be well miscible with gasoline. It is an ideal blending component for the production of unleaded gasoline, high octane number, and oxygenated gasoline. As a gasoline additive, it has been used worldwide commonly used within. It can not only effectively improve gasoline octane number and gasoline combustion efficiency, make automobile exhaust lead-free, but also improve automobile performance, reduce CO emissions, and reduce other harmful substances (such as ozone, benzene, butadiene, etc.) emissions and reduce the cost of gasoline. At the same time, it is also an important chemical raw material...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C43/04C07C41/42C07C19/03C07C17/386
CPCC07C17/386C07C41/42C07C43/04C07C19/03
Inventor 樊冬娌曹宇锋石健李建华苏广均单佳慧
Owner NANTONG UNIVERSITY