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Recovery method for ionic liquid

A technology of ionic liquid and recovery method, applied in the field of solvent recovery of liquid-liquid extraction

Inactive Publication Date: 2007-04-11
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The recovery and recycling of ionic liquids is the key to its large-scale application, and the recovery of ionic liquids has not been reported yet.

Method used

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  • Recovery method for ionic liquid
  • Recovery method for ionic liquid
  • Recovery method for ionic liquid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Take the hydrophobic ionic liquid [Bmim]PF of 300mL penicillin 6 Solution, add potassium carbonate aqueous solution, make the solution pH ≥ 7, and electromagnetically stir at room temperature to make the alkalization reaction complete; stand for stratification, take the ionic liquid phase and add deionized water, wash to neutral; stand for stratification, in the ion Add 0.5--10% activated carbon (charcoal g / 100mL ionic liquid) to the liquid phase, stir and filter; heat and distill under reduced pressure until the water content is qualified. No penicillin was detected in the ionic liquid by high-pressure liquid chromatography, and the recovery yield of the ionic liquid was 94%.

Embodiment 2

[0038] Take the hydrophobic ionic liquid [Bmim]PF of 300mL erythromycin 6 solution, add sulfuric acid aqueous solution to make the solution pH ≤ 5, electromagnetically stir at room temperature to complete the acidification reaction; stand for stratification, take the ionic liquid phase and add deionized water, wash to neutral; stand for stratification, in the ionic liquid phase Add 0.5--10% activated carbon (charcoal g / 100mL ionic liquid), stir, filter; heat and distill under reduced pressure until the water content is qualified. No penicillin is detected in the ionic liquid by high-pressure liquid chromatography, and the recovery yield of the ionic liquid is 90%.

Embodiment 3

[0040] Take 500mL hydrophilic ionic liquid [Bmim]BF 4 and potassium phosphate to form the upper phase of the two-phase, according to the extraction solvent CHCl 3 Add the extractant at a volume ratio of 5:1 to the upper phase, stir to balance the extraction, the system is divided into upper and lower phases, separate the phases, and take the enriched extractant CHCl 3 and hydrophilic ionic liquid [Bmim]BF 4 The upper phase is added with process water for washing, the ionic liquid enters the water phase, the water phase is collected, heated and distilled under reduced pressure until the water content is qualified. The recovery yield of the ionic liquid was 60%.

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Abstract

The present invention relates to solvent recovering technology, and is especially method of recovering hydrophobic ionic liquid and hydrophilic ionic liquid after antiseptic extraction. The technological process of hydrophobic ionic liquid includes the steps of alkalization or acidification, water washing, decolorizing and dewatering; and the technological process of hydrophilic ionic liquid includes the steps of extracting solvent, water washing and dewatering. The present invention makes it possible to utilize extracting solvent circularly.

Description

technical field [0001] The invention relates to the field of solvent recovery of liquid-liquid extraction, in particular to a recovery method after antibiotics are extracted by hydrophobic ionic liquids and hydrophilic ionic liquids. Background technique [0002] Liquid-liquid extraction is an efficient method for the separation of antibiotics and is widely used in the extraction of antibiotics. Industrially, antibiotic extraction generally uses organic solvents as extractants, and uses distillation towers to recover organic solvents. Organic solvents are flammable, volatile and cause environmental pollution. At the same time, there is a potential explosion hazard, which limits their application. In recent years, the application of ionic liquids as green solvents in extraction reactions and synthesis reactions has attracted more and more attention. Ionic liquids have almost no vapor pressure, are non-flammable, have good thermal stability, and good electrical conductivity,...

Claims

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Application Information

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IPC IPC(8): C07B63/00B01D11/00C07F5/02
CPCY02P20/54
Inventor 刘庆芬余江夏寒松胡雪生刘会洲
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI