Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Preparation method of ionic liquid for selectively separating water-ethanol azeotropic system

An ionic liquid, selective technology, applied in the material science field of ionic liquid synthesis, to achieve the effect of reducing cost, reducing use, simple and controllable operation

Inactive Publication Date: 2015-09-09
HEFEI UNIV
View PDF3 Cites 5 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] Purpose of the invention: Aiming at the existing deficiencies in the existing water-ethanol azeotropic system, this invention uses the synthetic selective functional group - hydroxyl for the first time to functionally modify imidazole ionic liquids, and for the first time the modified Application of Ionic Liquids in the Separation of Water-Ethanol System

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Preparation method of ionic liquid for selectively separating water-ethanol azeotropic system
  • Preparation method of ionic liquid for selectively separating water-ethanol azeotropic system
  • Preparation method of ionic liquid for selectively separating water-ethanol azeotropic system

Examples

Experimental program
Comparison scheme
Effect test

specific Embodiment approach

[0039] detailed description: A method for preparing an ionic liquid selectively separated from a water-ethanol azeotropic system, comprising reacting N-methylimidazole and 2-bromoethanol under ultrasonic conditions, and purifying the product. It is characterized in that: the cationic group in the ionic liquid has a hydroxyl group, and the hydroxyl group on its surface can be further combined with the more polar component water in the water-ethanol azeotropic system through chemical affinity, hydrogen bond force and ion interaction. Under the action of electrostatic attraction, a selective solvation reaction occurs with the molecules of the component water to form a non-volatile ionic liquid-water association, thereby reducing the number of molecules of the component water in the equilibrium vapor phase and reducing its vapor pressure , the addition of the ionic liquid reduces the volatility of water, thereby increasing the partial pressure of the vapor phase of ethanol, incre...

Embodiment

[0043] Example: Using N-methylimidazole and 2-bromoethanol as reactants, the ultrasonic synthesis method is used to prepare ionic liquids, and the hydroxyl groups contained in them can selectively bind to the component water in the water-ethanol system to realize the dual reaction of water-ethanol Separation of azeotropic systems.

[0044] The first step is the preparation of bromide-1-methyl-3-(2-hydroxyethyl)imidazole ionic liquid: first, use an electronic balance with a scale of 1 / 10,000 to accurately weigh 48.2502 g of N-methylimidazole, 61.5670 g2-Bromoethanol was successively placed in a 250 mL round-bottomed flask, ultrasonically dispersed for 5 min at a vibration frequency of 100 Hz at room temperature, and then a reflux device was built with the flask with a serpentine condenser tube with ground openings at both ends. The upper mouth of the condenser tube is plugged with a ground glass plug, tap water at room temperature is used as the condensation medium, and then th...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
freezing pointaaaaaaaaaa
Login to View More

Abstract

The invention provides a preparation method of ionic liquid for selectively separating a water-ethanol azeotropic system. The preparation method is characterized in that cationic groups in the synthetic ionic liquid have hydroxyl. The preparation method comprises the following steps: reacting N-methylimidazole with 2-bromoethanol under the condition of constant-temperature ultrasonic reflux to prepare bromo-1-methyl-3-(2-hydroxylethyl) imidazole; then, purifying bromo-1-methyl-3-(2-hydroxylethyl) imidazole to obtain the ionic liquid of bromo-1-methyl-3-(2-hydroxylethyl) imidazole. The preparation method has the advantages that the synthesis process is simple, and the prepared ionic liquid is non-volatile, good in stability, friendly to the environment and obvious in 'salt effect'; groups in the ionic liquid are capable of selectively bonding component water in the water-ethanol azeotropic system to generate a solvation reaction under the actions of chemical affinity, hydrogen bond force and electrostatic attraction of ions to produce a nonvolatile ionic liquid-water associated complex so that water vapor pressure is lowered, the volatility of water is reduced, steam phase partial pressure and relative volatility of ethanol are increased and the 'salting out' phenomenon appears and thus the water-ethanol azeotropic system is separated.

Description

[0001] Field [0002] The invention relates to the material science field of ionic liquid synthesis, in particular to a preparation method of ionic liquid selectively separated from water-ethanol azeotropic system. Background technique [0003] From the point of view of the separation of the azeotropic system, it is a mixture of different compound binary or multi-component liquids, which cannot be completely separated by simple rectification. In recent years, the exploration of the water-ethanol azeotropic system has attracted widespread attention and fruitful exploration from social research institutions. In order to separate the azeotropic system or the system with components close to the boiling point, people have studied various methods for a long time, such as: rectification, absorption, liquid-liquid extraction and some new separation techniques, such as supercritical extraction, adding salt essence, etc. Distillation, membrane separation, adsorption and membrane separa...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): C07D233/60C07C29/82C07C31/08
CPCC07D233/60C07C29/82C07C31/08
Inventor 高大明陈红李军方玲张慧孙虹张凌云朱德春
Owner HEFEI UNIV
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com