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Method for separating toluene-methanol through extractive distillation

An extractive distillation and extractive distillation tower technology, which is applied in the field of separation of toluene and methanol, can solve problems such as difficulty in finding ionic liquids, and achieve the effects of good separation effect, easy control and reduced energy consumption.

Pending Publication Date: 2022-03-11
SHENYANG INSTITUTE OF CHEMICAL TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

It is difficult to find suitable ionic liquids only by experimentation

Method used

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  • Method for separating toluene-methanol through extractive distillation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Embodiment 1: as figure 1 The extractive distillation process shown. The extractive distillation column 1 has 19 theoretical plates, the extractant 1-butyl-2,3-dimethylimidazole acetate enters from the 2nd theoretical plate, and the flow rate is 10kg / h, and the mixture of toluene and ethanol enters from the 9th theoretical plate Block theoretical plate enters, and composition is toluene 82.0wt%, ethanol 18.0wt%, and flow rate is 100kg / h; Extractive distillation column 1 normal pressure operation, reflux ratio 2, the toluene that mass fraction can be obtained at the tower top is 99.5wt%, tower The still discharge is 1-butyl-2,3-dimethylimidazole acetate-methanol mixed solution with a toluene content lower than 0.01 wt%; It is 110Pa, and the theoretical plate of extraction agent recovery tower 2 is 4 pieces, and 99.5wt% methanol is obtained at the top, and 99.0wt% 1-butyl-2,3-dimethylimidazole acetate is obtained at the bottom, which can be recycled.

Embodiment 2

[0020] Embodiment 2: as figure 1 The extractive distillation process shown. The extractive distillation column 1 has 22 theoretical plates, the extractant 1-butyl-2,3-dimethylimidazole acetate enters from the second theoretical plate, and the flow rate is 12kg / h, and the mixture of toluene and methanol enters from the 10th theoretical plate Block theoretical plate enters, and composition is toluene 77.0wt%, methyl alcohol 23.0wt%, and flow rate is 110kg / h; Extractive distillation tower 1 normal pressure operation, reflux ratio 2.5, the toluene that mass fraction can be obtained at the tower top is 99.5wt%, tower The still discharge is 1-butyl-2,3-dimethylimidazole acetate-methanol mixed solution with a toluene content lower than 0.01 wt%; It is 120Pa, and the theoretical plate of extraction agent recovery tower 2 is 6 pieces, 99.5wt% methanol is obtained at the top, and 99.0wt% 1-butyl-2,3-dimethylimidazole acetate is obtained at the bottom, which can be recycled.

Embodiment 3

[0021] Embodiment 3: as figure 1 The extractive distillation process shown. The extractive distillation column 1 has 25 theoretical plates, the extractant 1-butyl-2,3-dimethylimidazole acetate enters from the second theoretical plate, and the flow rate is 15kg / h, and the mixture of toluene and methanol enters from the 11th theoretical plate. Block theoretical plate enters, and composition is toluene 72.0wt%, methyl alcohol 28.0wt%, and flow rate is 130kg / h; Extractive distillation tower 1 normal pressure operation, reflux ratio 3, the toluene that mass fraction can be obtained at the top of the tower is 99.5wt%, tower The still discharge is 1-butyl-2,3-dimethylimidazole acetate-methanol mixed solution with a toluene content lower than 0.01 wt%; 150Pa, the theoretical plate of extractant recovery tower 2 is 6 pieces, 99.5wt% methanol is obtained at the top, and 99.0wt% 1-butyl-2,3-dimethylimidazole acetate is obtained at the bottom, which can be recycled.

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Abstract

The invention discloses a method for separating toluene-methanol by extractive distillation, and relates to a method for separating toluene-methanol, the method takes ionic liquid (1-butyl-2, 3-dimethylimidazole acetate) as an extraction agent, and the adopted device comprises an extractive distillation tower (1) and an extraction agent recovery tower (2). The extractive distillation tower (1) is a normal-pressure distillation tower, the top of the extractive distillation tower (1) is provided with an extractant inlet and a condensation reflux device, raw materials enter from the middle of the tower, toluene with the purity higher than 99.5 wt% is output from a tower top discharge port of the extractive distillation tower (1), and a mixture of methanol and an extractant flows out from the bottom of the extractive distillation tower (1) and flows in from the top of the extractant recovery tower (2). The extraction agent recovery tower (2) is a vacuum rectification tower, methanol with the purity of 99.5 wt% is output from the top of the extraction agent recovery tower (2), and the extraction agent is output from the bottom of the extraction agent recovery tower (2) and flows back to the extraction rectification tower (1) for reuse. The method has the advantages that the operation is convenient, the control is easy, the recycling of the solvent is realized, the energy consumption is reduced, the cost is reduced, the separation effect is better, the economy is very good, and the environmental protection is facilitated.

Description

technical field [0001] The invention relates to a method for extracting and rectifying separation of toluene-methanol, in particular to a method for separating toluene-methanol. Background technique [0002] Both toluene and methanol are important chemical basic raw materials. During the production and use of toluene and methanol, azeotropes will be produced, which cannot be separated by ordinary methods. Extractive distillation is a common method for industrial separation of azeotropes . Extractive distillation is a special rectification method that adds a third component (called extractant or solvent) to the raw material liquid to change the relative volatility between the original components to meet the separation requirements. The boiling point of each component in the raw material liquid is much higher, and does not form an azeotropic liquid with the components, and is easy to recover. The key technology of extractive distillation is the selection of extractant. Tradi...

Claims

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Application Information

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IPC IPC(8): C07C7/08C07C15/06C07C29/84C07C31/04G16C10/00G16C20/10
CPCC07C7/08C07C29/84G16C10/00G16C20/10C07C15/06C07C31/04
Inventor 张弢于星渤司展李龙霞李文秀
Owner SHENYANG INSTITUTE OF CHEMICAL TECHNOLOGY
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