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Method for complexing and removing water contained in ethanol and water mixed solution by utilizing eutectic solvent

A low eutectic solvent and mixed solution technology, applied in chemical instruments and methods, preparation of organic compounds, preparation of hydroxyl compounds, etc., can solve the problem of high energy consumption, and achieve high dehydration efficiency, high complexation efficiency and low cost. Effect

Active Publication Date: 2013-12-25
HEBEI UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There are certain deficiencies, such as high energy consumption, etc.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Add commercially available 95% ethanol-water mixed solution into complex still 1, add deep eutectic solvent, and keep stirring for 1 hour. Let stand for 20 minutes. In the complexing still, the temperature in the complexing stage is 25°C, the pressure in the complexing stage is 0.1MPa, and the mass ratio of the deep eutectic solvent to the water in the ethanol-water mixed solution is 16.5:1; the deep eutectic solvent used Made from choline chloride and urea in a weight ratio of 1:2. The complex still has a volume of 3 cubic meters and a ratio of height to diameter of 2:1.

[0026] In the complex distillation kettle, the temperature in the distillation stage is 80°C, and the pressure in the distillation stage is 0.1MPa. After the distillation, the complex solution formed by the water in the ethanol-water mixed solution and the deep eutectic solvent is pumped into the evaporation kettle. °C and a vacuum of 0.7 MPa to dehydrate under reduced pressure to obtain a regenera...

Embodiment 2

[0029] Add the commercially available 95% ethanol-water mixed solution into the complex still, add the deep eutectic solvent, and keep stirring for 2 hours. Let stand for 10 minutes. In the complexing still, the temperature of the complexing stage is 35°C, the pressure of the complexing stage is 0.1MPa, and the mass ratio of the deep eutectic solvent to the water in the ethanol-water mixed solution is 25:1; the deep eutectic The solvent is a mixture of choline chloride and glycerin with a weight ratio of 1:3. The complex still has a volume of 3 cubic meters and a ratio of height to diameter of 2:1.

[0030] The temperature in the distillation stage is 80°C, and the pressure in the distillation stage is 0.1MPa. After the distillation, the complex solution formed by the water in the ethanol-water mixed solution and the deep eutectic solvent is pumped into the evaporation kettle. The regenerated deep eutectic solvent was obtained by dehydration under reduced pressure at 100°C f...

Embodiment 3

[0033] Add the commercially available 95% ethanol-water mixed solution into the complex still, add the deep eutectic solvent, and keep stirring for 0.5 hours. Let stand for 15 minutes. In the complexing still, the temperature in the complexing stage is 40°C, the pressure in the complexing stage is 0.1MPa, the mass ratio of the deep eutectic solvent to the water in the ethanol-water mixed solution is 20:1; the deep eutectic The solvent is a mixture of choline chloride and urea in a weight ratio of 1:2. The complex still has a volume of 3 cubic meters and a ratio of height to diameter of 2:1.

[0034] The temperature in the distillation stage is 80°C, and the pressure in the distillation stage is 0.1MPa. After the distillation, the complex solution formed by the water in the ethanol-water mixed solution and the deep eutectic solvent is pumped into the evaporation kettle. The regenerated deep eutectic solvent was obtained by dehydration under reduced pressure at 100°C for recyc...

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Abstract

The invention belongs to the technical field of chemical engineering, and particularly relates to a method for complexing and removing water contained in an ethanol and water mixed solution by utilizing an eutectic solvent. The method is used for preparing anhydrous ethanol. The method disclosed by the invention can be used for complexing the water contained in the ethanol and water mixed solution by utilizing the eutectic solvent and then removing the water contained in the ethanol and water mixed solution through distillation, is especially suitable for preparing the anhydrous ethanol by removing the water contained in the 95% ethanol and water mixed solution and prevents the high energy consumption of an extractive distillation method and an azeotropic distillation method. According to the invention, the eutectic solvent which plays a complexing agent role can be recycled after being removed in water through evaporation. The method disclosed by the invention has the advantages of easiness for process operation, low cost, no wastewater discharge, mildness in complexing condition, operation at low temperature and normal pressure and high production safety and is suitable for small-scale device production and also suitable for large-scale device production.

Description

technical field [0001] The invention relates to a method for removing moisture in an ethanol-water mixed solution by complexing with a deep eutectic solvent. Background technique [0002] Anhydrous ethanol is an important chemical raw material. Widely used in medicine, pesticide, paint, food, cosmetics, rubber, electronics and other industries. In addition, denatured fuel ethanol can be formed by adding modifiers to absolute ethanol. Denatured fuel ethanol is blended with gasoline in a certain proportion to form ethanol gasoline for vehicles, which can be used as an environmentally friendly fuel for vehicles. In recent years, with the continuous rise of energy prices, measures to save oil resources have been included in the outline of the national science and technology development plan. The absolute ethanol project for vehicles has been actively promoted in some provinces. [0003] The purity that ethanol can achieve is an important quality indicator of absolute ethanol...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C31/08C07C29/88
Inventor 冯丹华宋丽英其他发明人请求不公开姓名
Owner HEBEI UNIVERSITY OF SCIENCE AND TECHNOLOGY
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