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Method for separating Ethylene glycol monomethyl ether, methanol and water by rectification and azeotropy

A combination of ethylene glycol monomethyl ether and ethylene glycol monomethyl ether, which is applied in the field of separation of ethylene glycol monomethyl ether, methanol and water by means of rectification and azeotropy, and can solve problems such as difficult regeneration

Inactive Publication Date: 2008-03-26
NANJING NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, desiccant (such as CaCl 2 ) etc. are first dehydrated, then methanol and ethylene glycol monomethyl ether are separated by rectification, and CaCl is used in industrial production 2 The slurry produced by dehydration is difficult to regenerate, and 2 to 3% (mass) of methanol and ethylene glycol monomethyl ether are entrained in the slurry, which is easy to cause certain problems to the environment

Method used

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  • Method for separating Ethylene glycol monomethyl ether, methanol and water by rectification and azeotropy

Examples

Experimental program
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Effect test

Embodiment 1

[0014] Embodiment 1, the method for separating ethylene glycol monomethyl ether, methanol and water by rectification and azeotropy, with reference to the process shown in Figure 1 and the parameters shown in Table 2, the raw material (F1) is ethylene glycol monomethyl ether+ Methanol+water mixed solution, the mass content (Xf1, Xf2, Xf3) of ethylene glycol monomethyl ether, methyl alcohol and water is 59.7%, 30.0%, 10.3% respectively, and flow rate is 12.3Kg / h, precision rectifying tower (T -1) When the top and low temperatures are 64-65°C and 87-89°C respectively, the top and low flow rates are 3.69Kg / h and 8.61Kg / h respectively, and the top reflux ratio (R1) of the precision distillation column is controlled at 4~ 5. Composition of the top and bottom of the tower (x Di , x wi )x D1 = 0.0000, x D2 = 0.9991, x D3 =0.0009,x w1 =0.8529,x w2 =0.0003,x w3 =0.1468; the water-containing material at the bottom of the tower is sent to the azeotropic device (T-2), and benzene is...

Embodiment 2

[0019] Example 2 is basically the same as Example 1, but with the following changes: the ratio of entrainer to raw material is 0.5:1; the entrainer is toluene.

Embodiment 3

[0020] Embodiment 3 is basically the same as Embodiment 1, but with the following changes: the ratio of entrainer to raw material is 1:1; the entrainer is cyclohexane.

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Abstract

The rectification and azeotropy process of separating ethylene glycol monomethyl ether, methanol and water includes the following steps: 1. separating mixed solution of ethylene glycol monomethyl ether, methanol and water in addition rectifier to obtain methanol with water content lowered to below 0.1 % in the tower top, and mixed solution of water and ethylene glycol monomethyl ether in the tower bottom; 2. mixing azeotrope former and the mixed solution of water and ethylene glycol monomethyl ether in the ratio of 0.5-1 to 1 and distilling in an azeotropic distillation plant to obtain ethylene glycol monomethyl ether with water content lowered to below 0.2 %; and 3. reusing benzene in the azeotropic distillation plant and reusing ethylene glycol monomethyl ether as material. The separating process can obtain ethylene glycol monomethyl ether and methanol of purity over 99.8 % and water for reuse, and is environment friendly.

Description

technical field [0001] The invention relates to a chemical separation process, in particular to a method for separating ethylene glycol monomethyl ether, methanol and water by combining rectification and azeotropy. technical background [0002] With the rapid development of my country's economic construction, people's demand for high-grade paint and coating solvent - ethylene glycol monomethyl ether acetate is increasing. It is estimated that the current annual demand is about 100,000 tons, while the domestic annual output is only 4 The production of ethylene glycol monomethyl ether acetate is mainly based on acid (solid acid or inorganic acid) as catalyst, and ethylene glycol monomethyl ether and acetic acid are used as catalysts for the production of ethylene glycol monomethyl ether acetate. The raw material adopts solid acid or inorganic acid as catalyst. In the synthesis process, excessive acetic acid or ethylene glycol monomethyl ether is generally used. The method of us...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C43/13C07C41/34C07C31/04C07C29/74
Inventor 顾正桂林军
Owner NANJING NORMAL UNIVERSITY
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