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A method and device for separating a mixture of toluene and ethanol

A mixture, ethanol technology, applied in chemical instruments and methods, preparation of organic compounds, extraction and purification/separation, etc., can solve the problems of difficult separation, large investment and process energy consumption, high energy consumption, etc., and achieve the goal of improving separation efficiency. Effect

Active Publication Date: 2017-07-14
烟台远东精细化工有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] In chemical and pharmaceutical production processes, toluene and lower aliphatic alcohols are often used as solvents. For example, in the production processes of avermectin refining and liquid crystal intermediates, ethanol and toluene are used as solvents together. After use, these solvents It is used as a waste solvent and sent to a solvent recovery device for recovery. However, toluene and ethanol form an azeotrope. To obtain high-purity toluene and ethanol products at the same time, it cannot be achieved by ordinary distillation. Extractive distillation or azeotropic distillation is often used. Separation by the method, such as Hou Tao et al (extractive distillation simulation and optimization of toluene-ethanol azeotropic system, Journal of Petrochemical Universities, 2008, 25 (4): 21-23, 28), studied the use of n-butylbenzene For the process of solvent extraction and rectification to separate toluene and ethanol, Zhang Huan et al. (Economic optimization design of pressure swing rectification separation toluene-ethanol system, Energy and Chemical Industry, 2014, 35(6): 31-34) studied pressure swing refinery Distillation and separation of toluene and ethanol; however, the investment and process energy consumption of these processes are relatively large
There is also the use of water as the extractant to extract ethanol from toluene. However, due to the presence of ethanol, the solubility of toluene to water increases, and the solubility of water to toluene also increases. Therefore, although the ternary system of toluene, ethanol, and water It can separate phases, but toluene still contains a large amount of ethanol and water, and water also contains a large amount of toluene, while toluene and water, water and ethanol, ethanol and toluene form a binary azeotrope, and toluene, ethanol, and water form a ternary azeotrope Boilers, so separation is difficult and consumes a lot of energy

Method used

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  • A method and device for separating a mixture of toluene and ethanol

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] Embodiment 1 A kind of method for separating toluene and ethanol mixture, comprises the following steps:

[0046] A. Extract the ethanol in the toluene with saline water, and then use ordinary rectification to refine the toluene;

[0047] B, the trace toluene in the mixture containing salt, water, ethanol, trace toluene in the xylene extraction step A, the mixture containing xylene, toluene, trace ethanol goes to step A;

[0048] C, extract the ethanol in the salt, water and ethanol mixture with xylene in step B, then separate xylene and ethanol with ordinary rectification, remove the water and salt mixture of ethanol and return to step A for recycling;

[0049] D. The xylene obtained by refining toluene and ethanol is reused.

[0050] Described salt comprises: lithium sulfate, sodium sulfate, potassium sulfate, ferrous sulfate, iron thiocyanate, sodium thiocyanide, potassium thiocyanide, sodium acetate, potassium acetate, sodium carbonate, potassium carbonate, sodium ...

Embodiment 2

[0051] Embodiment 2 The main equipment that realizes the method for separating toluene and ethanol mixture includes:

[0052] Ethanol extraction tower (3), toluene extraction tower (6), toluene refining tower (9), ethanol stripping tower (13), ethanol refining tower (17).

[0053] Process flow:

[0054] The ethanol extraction tower (3) is an extraction tower for extracting and separating ethanol. Toluene and ethanol mixture (1) enters the middle and lower part of the ethanol extraction tower (3), the water that adds salt enters the ethanol extraction tower (3) top, the mixture (7 ) into the lower part of the ethanol extraction tower (3), obtain the mixture (5) containing non-polar solvent A and toluene from the ethanol extraction tower (3) tower top, and obtain the mixture (5) containing ethanol, water, salt and toluene in the ethanol extraction tower (3) tower still Mixture with traces of toluene (4); usable salts include: lithium sulfate, sodium sulfate, potassium sulfate,...

experiment example 1

[0061] Experimental Example 1: A mixture containing 70% toluene and 30% ethanol was extracted with an aqueous solution containing 4% sodium sulfate. After one extraction, the water layer contained 23.72% ethanol, 3.12% toluene, and 73.16% water, and the organic layer contained 98.71% toluene , containing 1.27% ethanol and 0.02% water; after the second extraction, the organic layer contained 99.41% toluene, 0.56% ethanol, and 0.01% water; after three extractions, the organic layer contained 99.95% toluene, 0.03% ethanol, and 0.02% water.

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PUM

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Abstract

The invention provides a method for separating toluene and ethanol mixture, comprising the steps of: (1) extracting ethanol in toluene with saline water, and then refining toluene with ordinary rectification; (2) extracting step (1) with xylene ) containing salt, water, ethanol, trace amount of toluene in the mixture of trace amounts of toluene, and the mixture containing xylene, toluene, trace amount of ethanol goes to step (1); (3) extracting step (2) containing salt, water, The ethanol in the ethanol mixture is separated from xylene and ethanol by ordinary rectification, and the water and salt mixture of ethanol are removed and recycled in step (1); (4) the xylene obtained by toluene refining and ethanol refining is reused. The method has complete separation and low energy consumption.

Description

technical field [0001] The invention belongs to the field of separation of chemical products, and relates to a method for separating a mixture of toluene and ethanol, in particular to a method for separating a mixture of toluene and ethanol by combining extraction, rectification, and salt addition. Background technique [0002] In chemical and pharmaceutical production processes, toluene and lower aliphatic alcohols are often used as solvents. For example, in the production processes of avermectin refining and liquid crystal intermediates, ethanol and toluene are used as solvents together. After use, these solvents It is used as a waste solvent and sent to a solvent recovery device for recovery. However, toluene and ethanol form an azeotrope. To obtain high-purity toluene and ethanol products at the same time, it cannot be achieved by ordinary distillation. Extractive distillation or azeotropic distillation is often used. Separation by the method, such as Hou Tao et al (extr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C15/06C07C7/10C07C7/04C07C31/08C07C29/86C07C29/80
Inventor 梁燕王文华郝肖李云飞冯咏梅
Owner 烟台远东精细化工有限公司
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