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Process for separating ethandiol, mono methyl ether, isopropyl alcohol and water combined by extracting and axeotropy

A technology of ethylene glycol monomethyl ether and isopropanol, which is applied in the field of extraction and azeotropic separation, and can solve problems such as difficult regeneration, environmental problems, and waste of resources

Inactive Publication Date: 2005-01-05
NANJING NORMAL UNIVERSITY
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  • Abstract
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  • Claims
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Problems solved by technology

In current industrial production, desiccant (such as CaCl 2 ) etc. are first dehydrated, then adopt rectification to separate isopropanol and ethylene glycol monomethyl ether, and use CaCl in industrial production 2 The slurry produced by dehydration is difficult to regenerate, and 2-3% (mass ratio) of isopropanol and ethylene glycol monomethyl ether are entrained in the slurry, which not only wastes resources, but also easily causes certain problems to the environment

Method used

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  • Process for separating ethandiol, mono methyl ether, isopropyl alcohol and water combined by extracting and axeotropy

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Embodiment Construction

[0009] Extraction and azeotropic combination separation method of ethylene glycol monomethyl ether, isopropanol and water, refer to figure 1 Shown technology and parameter shown in table 2, raw material (F1) is ethylene glycol monomethyl ether+isopropanol+water mixed solution, the mass content of ethylene glycol monomethyl ether, isopropanol and water (Xf1, Xf2, Xf3 ) were 10%, 50%, and 40% respectively, and the flow rate was 4.1Kg / h. When the top and low temperatures of precision rectification tower T-1 were 80.4°C and 87.5°C respectively, the top and low flow rates were 2.7Kg / h, 1.4Kg / h, precision rectification ℃ The top reflux ratio (R1) is controlled at 4~6, the composition of the top and bottom of the tower (x Di , x wi )x D1 = 0.0000, x D2 =0.7592,x D3 =0.2407,x w1 =0.2929,x w2 =0.0000x w3 =0.7071; the top component is sent to the extractive distillation unit (T-2), the ratio of extractant (glycerin) to raw material S / F2=2.5:1, the top reflux ratio R2 is controlle...

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Abstract

The invention is a method of combining extraction and azeotropism to separate glycol monomethyl ether, isopropyl alcohol and water, and its steps: using glycerol and benzene as extractant and azeotropic agent, respectively, adopting a rectifying device to separate a mixed solution with isopropyl alcohol plus water plus glycol monomethyl ether, after separating, the isopropyl alcohol plus water is on the tower top and the water plus glycol monomethyl ether is in the tower bottom; separating the distillate from the tower top by extract-rectification process with the glycerol as extractant; after extraction separation, feeding the water plus glycol monomethyl ether in the bottom to an azeotropic distilling device and adopting the benzene as azeotropic agent, where the benzene is recycled. The contents of glycol monomethyl ether and sopropyl alcohol can both reach 99.5% above; those in the water are both lower than below 0.23% and it can primarily obtain glycol monomethyl ether acetate, after separating, the isopropyl alcohol is recycled, the glycol monomethyl ether is returned as raw material.

Description

technical field [0001] The invention relates to a chemical separation process, in particular to a separation method combining extraction and azeotropy of ethylene glycol monomethyl ether, isopropanol and water. Background technique [0002] substance Azeotropic temperature degree(℃) Azeotropic composition water + isopropanol 80.3℃ 12.6% water, 87.4% isopropanol Water + ethylene glycol monomethyl ether 99.9℃ 15.3% water, 84.7% ethylene glycol monomethyl ether [0003] The azeotrope produced is (isopropanol + water + ethylene glycol monomethyl ether), therefore, whether isopropanol + water + ethylene glycol monomethyl ether can be effectively separated is related to the excess of ethylene glycol monomethyl ether Whether the law can be industrialized. In current industrial production, desiccant (such as CaCl 2 ) etc. are first dehydrated, then adopt rectification to separate isopropanol and ethylene glycol m...

Claims

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Application Information

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IPC IPC(8): C07C41/40C07C43/13
Inventor 顾正桂林军
Owner NANJING NORMAL UNIVERSITY
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