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Method for separating methanol-toluene azeotrope through continuous extractive distillation

A technology of extractive distillation and extractive distillation column, which is applied in the field of continuous extraction and distillation to separate methanol-toluene azeotrope, and can solve problems such as not being suitable for continuous production

Pending Publication Date: 2021-05-11
SHANDONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method uses batch extraction and rectification, which is not suitable for continuous production

Method used

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  • Method for separating methanol-toluene azeotrope through continuous extractive distillation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Such as figure 1 The extractive distillation process shown. The number of theoretical plates of the extractive distillation column T1 is 50, the extractant butyl butyrate S is added from the 8th plate, the flow rate is 100 kmol / h, the mixture of methanol and toluene (methanol 0.5+toluene 0.5) F is fed from the 30th plate The plate is added, and the flow rate is 100 kmol / h. The extractive distillation tower T1 is operated under normal pressure, the reflux ratio is 0.8, the output at the top of the tower is 49.985 kmol / h, the methanol product with a mole fraction of 0.999 is obtained at the top of the tower, and toluene and the extractant butyl butyrate are obtained at the bottom of the tower The mixture W of the mixture enters the solvent recovery tower T2 from the 18th tray, the number of theoretical trays of the solvent recovery tower T2 is 30, the reflux ratio is 1.2, the output at the top of the tower is 49.96kmol / h, and the mole fraction obtained at the top of the ...

Embodiment 2

[0032] Such as figure 1 The extractive distillation process shown. The theoretical plate number of extractive distillation column T1 is 46, the extractant butyl butyrate S is added from the 10th plate, the flow rate is 80 kmol / h, the mixture of methanol and toluene (methanol 0.2+toluene 0.8) F is fed from the 32nd plate The plate is added, and the flow rate is 100 kmol / h. The extractive distillation tower T1 is operated under normal pressure, the reflux ratio is 0.6, the output at the top of the tower is 20.739 kmol / h, the methanol product with a mole fraction of 0.999 is obtained at the top of the tower, and toluene and the extractant butyl butyrate are obtained at the bottom of the tower The mixture W of the mixture enters the solvent recovery tower T2 from the 12th tray, the number of theoretical trays of the solvent recovery tower T2 is 28, the reflux ratio is 0.95, the output at the top of the tower is 79.228kmol / h, and the mole fraction obtained at the top of the tower ...

Embodiment 3

[0034] Such as figure 1The extractive distillation process shown. The theoretical plate number of extractive distillation column T1 is 52, the extractant butyl butyrate S is added from the 12th plate, the flow rate is 115 kmol / h, the mixture of methanol and toluene (methanol 0.35+toluene 0.65) F is fed from the 38th plate The plate is added, and the flow rate is 100 kmol / h. The extractive distillation column T1 operates under normal pressure, the reflux ratio is 1.25, the output at the top of the tower is 34.96 kmol / h, the methanol product with a mole fraction of 0.999 is obtained at the top of the tower, and toluene and the extractant butyl butyrate are obtained at the bottom of the tower The mixture W of the mixture enters the solvent recovery tower T2 from the 18th tray, the number of theoretical trays of the solvent recovery tower T2 is 33, the reflux ratio is 1.6, the output at the top of the tower is 64.93kmol / h, and the mole fraction obtained at the top of the tower is...

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Abstract

The invention discloses a method for separating methanol-toluene azeotrope through continuous extractive distillation. According to the method, butyl butyrate is used as an extraction agent, a continuous extractive distillation method is adopted to separate a methanol-toluene azeotropic mixture, methanol and toluene are mixed and fed, the reflux ratio is 0.5-1.5, the molar flow ratio of the extraction agent to raw materials is 0.5-2, the fraction at the top of an extractive distillation tower is a methanol product, the fraction at the bottom of the extractive distillation tower is a mixture of toluene and the extraction agent, discharging from the tower bottom into a solvent recovery tower is carried out, toluene is obtained from the tower top of the solvent recovery tower, an extracting agent is obtained from the tower bottom, and the extracting agent can be recycled. The method disclosed by the invention is simple in process, low in cost, easy to operate, high in continuous rectification efficiency and simple in solvent recovery, the molar fraction of the treated methanol and toluene products is not less than 0.999, and the method can be industrially applied.

Description

technical field [0001] The invention belongs to the technical field of chemical separation, and in particular relates to a method for continuous extraction and rectification to separate methanol-toluene azeotrope. Background technique [0002] Methanol is one of the basic organic raw materials used to manufacture various organic products such as methyl chloride, methylamine and dimethyl sulfate. It is also the raw material of pesticides (insecticides, acaricides), medicines (sulfonamides, synamycin, etc.), and one of the raw materials for the synthesis of dimethyl terephthalate, methyl methacrylate and methyl acrylate. [0003] Toluene is mainly produced from crude oil through petrochemical processes. It is used as a solvent for oils, resins, natural and synthetic rubber, coal tar, pitch, cellulose acetate, as a solvent for cellulose paints and varnishes, and as a solvent for photographic plates and inks. Toluene is also a raw material for organic synthesis, especially ben...

Claims

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Application Information

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IPC IPC(8): C07C31/04C07C29/84C07C29/74C07C15/06C07C7/08C07C7/00
CPCC07C29/84C07C29/74C07C7/08C07C7/005
Inventor 徐冬梅何姗姗马艺心高军张连正范雯阳
Owner SHANDONG UNIV OF SCI & TECH
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