Method for extracting, distilling and separating alcohol-water solution through ethylene glycol and ionic liquid

An ionic liquid and extractive distillation technology, applied in the field of rectification and separation, can solve the problems of reducing plate efficiency, easily blocking equipment, and high energy consumption in azeotropic rectification.

Active Publication Date: 2014-03-05
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Patent CN1524006A uses ionic liquid as entrainer to separate near-boiling point or azeotropic mixture, but azeotropic rectification consumes a lot of energy and does not meet the requirements of energy saving and emission reduction
Patent CN1323773A introduces a method for producing absolute ethanol by one-step method of compound extraction and rectification. The mixed extraction agent is composed of solvent (ethylene glycol), reaction separation agent (Ca(OH) 2 etc.) and salting-out agent (CaCl 2 、K 2 CO 3 , AlCl 3 and other inorganic salts), but due to the strong corrosion of inorganic salts and easy blockage of equipment, the high viscosity of the mixture of ethylene glycol and inorganic salts reduces the efficiency of the board and other shortcomings, so that it is limited in actual production and application
However, there is no report on the separation of ethanol and water using ethylene glycol plus ionic liquids.

Method used

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  • Method for extracting, distilling and separating alcohol-water solution through ethylene glycol and ionic liquid
  • Method for extracting, distilling and separating alcohol-water solution through ethylene glycol and ionic liquid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Such as figure 1 The extractive distillation process shown. The extractive distillation column has 15 theoretical plates (the number of plates is counted from top to bottom), EG is used as the extractant to add from the third plate, the flow rate is 100kg / h, and the mixture of ethanol and water is added from the 11th theoretical plate Added to form ethanol 50wt%, water 50wt%, flow rate 100kg / h. The extractive distillation tower operates under normal pressure, the reflux ratio at the top of the tower is 1.0, and the output at the top of the tower is 50kg / h. As a result, an ethanol product with a mass fraction of 99.80% is obtained at the top of the tower, and the temperature at the top of the extractive distillation tower is 78.3 °C, the temperature of the tower kettle was 113.0 °C.

[0023] The bottom stream of the extractive distillation tower enters the solvent recovery tower. The solvent recovery tower has 4 theoretical plates (the number of plates is counted from ...

Embodiment 2

[0025] Such as figure 1 The extractive distillation process shown. The extractive distillation column has 15 theoretical trays (the number of trays is counted from top to bottom), and 90wt%EG+10wt%[EMIM][Ac] is used as the extractant to add from the third plate with a flow rate of 80kg / h. The mixture of ethanol and water is added from the 11th theoretical plate, the composition is 60wt% ethanol, 40wt% water, and the flow rate is 100kg / h. The extractive distillation tower operates under normal pressure, the reflux ratio at the top of the tower is 1.0, and the output at the top of the tower is 60kg / h. As a result, an ethanol product with a mass fraction of 99.70% is obtained at the top of the tower, and the temperature at the top of the extractive distillation tower is 78.3 °C, the temperature of the tower kettle was 110.3 °C.

[0026] The bottom stream of the extractive distillation tower enters the solvent recovery tower. The solvent recovery tower has 4 theoretical plates (...

Embodiment 3

[0028] Such as figure 1The extractive distillation process shown. The extractive distillation column has 15 theoretical trays (the number of trays is counted from top to bottom), and 80wt%EG+20wt%[EMIM][Ac] is used as the extractant to add from the third plate, and the flow rate is 70kg / h. The mixture of ethanol and water is added from the 11th theoretical plate, consisting of 70wt% ethanol and 30wt% water, with a flow rate of 100kg / h. The extractive distillation tower operates under normal pressure, the top reflux ratio is 3.0, and the output at the top of the tower is 70kg / h. As a result, an ethanol product with a mass fraction of 99.20% is obtained at the top of the tower, and the temperature at the top of the extractive distillation tower is 78.3 °C, the temperature of the tower kettle was 118.0 °C.

[0029] The bottom stream of the extractive distillation tower enters the solvent recovery tower. The solvent recovery tower has 4 theoretical plates (the number of plates i...

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Abstract

The invention relates to a method for extracting, distilling and separating alcohol-water solution through ethylene glycol and ionic liquid and belongs to the technical field of distillation separation. The method is characterized in that the ethylene glycol and ionic liquid are used as extraction agents to carry out the extraction distillation operation, the operation condition of an extraction distillation tower is normal pressure, an alcohol-water mixture raw material is fed through bubble points, the mass flow-rate ratio of the extraction agent and the alcohol-water mixture raw material is 0.5 to 6.0, the backflow ratio is 0.5 to 5.0, an alcohol product crossing azeotrope is obtained on the top of the tower, and the extraction distillation tower bottom is provided with a mixture of extraction agent, water and trace alcohol. By adopting the method, the phenomenon that the alcohol and the water are simultaneously boiled can be broken through, the selectivity is remarkably improved, and the high-purity low-grade alcohol solvent is obtained.

Description

technical field [0001] The invention relates to a method for separating alcohol aqueous solution, in particular adopting a composite solvent of ethylene glycol plus ionic liquid as an extractant to separate alcohol aqueous solution, and belongs to the technical field of rectification separation. Background technique [0002] Anhydrous alcohol solvents are important chemical reagents and organic solvents, as well as energy-saving and environmentally friendly green fuels, which are widely used in industrial production and life. However, lower alcohols and water will form azeotropes, and anhydrous alcohol solvents cannot be obtained by common rectification methods. At present, the methods for producing anhydrous alcohol solvent mainly include the following types: calcium oxide dehydration method, azeotropic distillation method, adsorption distillation method, pervaporation method, adsorption method, extractive distillation method and vacuum dehydration method. In actual indust...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C29/84C07C31/08C07C31/04C07C31/10C07C31/12
CPCC07C29/84C07C31/08
Inventor 雷志刚席晓敏李群生代成娜陈标华
Owner BEIJING UNIV OF CHEM TECH
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