Method for separating methanol-containing organic solvent binary azeotrope

A binary azeotrope and organic solvent technology, applied in the field of methanol-containing organic solvent binary azeotrope separation method, can solve the problems of complex separation and purification process, low purity of methanol and organic solvent, cumbersome process flow, etc. Achieve the effects of reducing condensation conditions, small footprint, and simple process

Inactive Publication Date: 2019-08-09
HYLEIN ENERGY & ENVIRONMENT TECH CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0017] The purpose of the present invention is to provide a methanol-containing organic solvent binary azeotrope separation method to solve the existing methanol-containing organic solvent binary azeotrope separation and purification process with complex operation, cumbersome process flow, high energy consumption, and The problem of large area and low purity of separated and recovered methanol and organic solvents

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  • Method for separating methanol-containing organic solvent binary azeotrope
  • Method for separating methanol-containing organic solvent binary azeotrope

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Embodiment 1

[0054] The ethyl acetate mixture material containing 60% methanol is transported to the rectification tower 1, and the ethyl acetate solution with a methanol content of 45% is obtained after the impurity removal and concentration of the rectification tower 1, and the methanol-containing organic solvent azeotropic material enters the infiltration In the circulation tank 7 of the vaporization membrane group 3, the heater heats the mixed material of ethyl acetate and methanol, and at the same time, the circulation pump 8 is turned on to heat the material evenly until the temperature reaches 120°C, and the vacuum pump 6 is turned on so that the vacuum degree of the permeate side is 10KPa; When the ethyl acetate and methanol materials reach a suitable operating temperature, increase the circulation rate so that the Reynolds number in the pervaporation membrane group 3 reaches about 13,000, and the system starts to repeatedly cycle out methanol and obtain ethyl acetate products with a...

Embodiment 2

[0056] Transport the toluene mixture material containing 80% methanol to the rectification tower 1, and obtain a toluene solution with a methanol content of 70% after the rectification tower 1 removes impurities and concentrates, and the azeotropic material of toluene and methanol enters the pervaporation membrane In the circulation tank of group 3, the heater heats the mixed material of toluene and methanol, and at the same time, the circulation pump 8 is turned on to heat the material evenly until the temperature reaches 130°C, and the vacuum pump 6 is turned on to make the vacuum degree reach 30KPa; when the toluene and methanol material reaches a suitable 130 ℃, increase the circulation rate, so that the Reynolds number in the pervaporation membrane group 3 reaches about 18,000, and the membrane system starts to repeatedly cycle out methanol and obtain a product with a methanol content of <0.5% toluene; when one of the circulation tanks starts to work, the other One circula...

Embodiment 3

[0058] The tetrahydrofuran mixture material containing 50% methanol is transported to the rectification tower one 1, and the tetrahydrofuran solution with a methanol content of 35% is obtained after the rectification tower one 1 removes impurities and concentrates, and the azeotropic material containing tetrahydrofuran and methanol enters the pervaporation After the ring tank of the membrane group 3, the heater heats the mixture of THF and methanol, and at the same time, the circulation pump 8 is turned on to heat the material evenly until the temperature reaches 120°C, and the vacuum pump 6 is turned on to make the vacuum reach 15KPa; when the ethyl acetate and methanol materials When the temperature reaches 120°C, increase the circulation rate so that the Reynolds number entering the pervaporation membrane group 3 reaches about 15,000, and the membrane system begins to repeatedly cycle out water and methanol and obtain a product containing methanol <0.5% THF; when one of the c...

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Abstract

The invention discloses a method for separating a methanol-containing organic solvent binary azeotrope. The method comprises the following steps: S1, rectifying a methanol-containing organic solvent solution by using a first rectification tower, and repeatedly heating and rectifying the solution to remove impurities and concentrate in order to obtain an methanol-containing azeotropic organic solvent A1; S2, heating the methanol-containing azeotropic organic solvent A1, performing repeated cycle purification by using pervaporation modules 3, heating the purified organic solvent A1 to a certaintemperature, separating a methanol vapor liquid A2 containing an extremely small amount of other organic solvents through a penetration side port under a vacuum condition under the action of pervaporation membranes, and cooling the methanol vapor liquid A2 by using a condenser to obtain a methanol solution A3 containing the extremely small amount of other organic solvents; and S3, rectifying the methanol solution A3 by using a second rectification tower to respectively obtain methanol and an azeotrope containing an extremely small amount of methanol. The method has the advantages of effectiveness in separation and recovery of the methanol-containing organic solvent binary azeotrope by using the modules and the rectification towers, low energy consumption, simplicity in operation of the whole system, simple process, solving of the difficulty in the separation of the methanol-containing azeotrope in the chemical industry, and saving of 30-60% of energy.

Description

technical field [0001] The invention relates to the technical field of preparation method of a methanol-containing organic solvent binary azeotrope separation method, in particular to a method for separating and purifying methanol and another organic solvent from a methanol-containing organic solvent azeotrope. Background technique [0002] Methanol is an important organic chemical raw material, second only to ethylene, propylene and benzene among the basic organic chemical raw materials in the world. Solvents such as toluene, ethyl acetate, tetrahydrofuran, acetone, and dimethyl carbonate are widely used as organic chemical raw materials. , fine chemicals and other fields have important applications. Methanol and many organic solvents form binary or ternary or even multiple azeotropes. At present, the azeotropes of methanol-containing organic solvents are separated by special rectification methods; [0003] In the pharmaceutical industry, more and more mixtures of ester so...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C29/74C07C29/80C07C31/04
CPCC07C29/74C07C29/80C07C31/04
Inventor 熊春刚杨震鸿李安武
Owner HYLEIN ENERGY & ENVIRONMENT TECH CO LTD
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