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Method for separating trace methanol and ethanol in ethylene glycol by atmospheric distillation column

A technology of atmospheric distillation and ethylene glycol, which is applied in chemical instruments and methods, preparation of organic compounds, organic chemistry, etc., can solve the problem of no stripping section, etc., and achieve the effect of improving purity and reducing energy consumption.

Inactive Publication Date: 2017-01-04
TIANJIN GOLDEN EAGLE TECH
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AI Technical Summary

Problems solved by technology

[0007] (2) During batch rectification, the whole tower is a rectification section, and there is no stripping section

Method used

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Examples

Experimental program
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Embodiment 1

[0019] A method utilizing an atmospheric rectification tower to separate trace methanol and ethanol in ethylene glycol, comprising the following steps:

[0020] Step 1: Add 5L of industrially purified ethylene glycol mixture into the still of the rectification tower. The content of methanol in the ethylene glycol mixture is 1150ppm, and the content of ethanol is 1380ppm.

[0021] Step 2: Set the temperature of the tower kettle to 150°C, strictly control the heat preservation of the whole tower, set the temperature at the top of the tower to 98°C, and start the total reflux timing when the steam reaches the top of the tower, and the total reflux time is 4 hours to ensure that the rectification tower The rising vapor and descending condensed liquid are in equilibrium.

[0022] Step 3: Complete reflux, adjust the reflux ratio to 4:1, and start extraction. After 6 hours, 13 mL of the product was obtained at the top of the tower, and the solution in the bottom of the tower was the...

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Abstract

The invention discloses a method for separating trace methanol and ethanol in ethylene glycol by using an atmospheric distillation column. The method comprises the following steps: (1) rectifying an ethylene glycol mixed solution containing the trace methanol and ethanol through a batch distillation column; (2) setting the temperature of a column reactor to be 145 to 150 DEG C, and the tower top temperature to be 95 to 100 DEG C, strictly controlling the whole-tower thermal insulation, keeping the total reflux time for 4 to 6 hours, and ensuring that rising steam and falling condensate liquids in the distillation column are in balance; (3) after the distillation column is stable, that is, the total reflux time is over, setting the reflux ratio to be (4: 1)-(9: 1) and the reflux time to be 3 to 6 hours, so as to obtain a tower kettle solution, namely the product. The method for separating the trace methanol and ethanol in ethylene glycol by the atmospheric distillation column has the advantages of simple operation, good separation effect, low energy consumption and the like.

Description

[0001] Technical field: [0002] The invention relates to a method for separating trace amounts of methanol and ethanol in ethylene glycol by means of an atmospheric rectification tower, and belongs to the technical field of chemical industry. [0003] Background technique: [0004] Rectification is a distillation method that uses reflux to separate liquid mixtures with high purity. It is the most widely used liquid mixture separation operation in industry, and is widely used in petroleum, chemical, light industry, food, metallurgy and other fields. [0005] When the separation requirements of the mixed liquid are high and the type or composition of the feed liquid changes frequently, the operation mode of batch rectification is more flexible. When doing batch rectification, the feed liquid is put into the rectification tank in batches, gradually heated and vaporized, and discharged at one time after the composition of the still liquid drops to the specified value. The batch d...

Claims

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Application Information

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IPC IPC(8): C07C29/80C07C31/20
CPCC07C29/80C07C31/20
Inventor 乔冠东
Owner TIANJIN GOLDEN EAGLE TECH
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