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Method for extracting and separating trifluoroethanol and water azeotrope by using porous ionic liquid

A technology of ionic liquid and trifluoroethanol, applied in chemical instruments and methods, preparation of organic compounds, preparation of hydroxyl compounds, etc., can solve problems such as high membrane cost, low reuse rate, and impact on human health

Active Publication Date: 2021-05-28
SHANDONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] But above-mentioned separation technology has defect and deficiency is: (1) extraction rectification and azeotropic rectification separate trifluoroethanol and water, and equipment cost is high, and energy consumption is bigger
(2) Judging from the current industrial application situation, due to the relatively high cost of the membrane and the low reuse rate, most of the membrane separation process still stays in the stage of laboratory membrane production
(4) azeotropic agent is highly toxic, affects human health, and is inflammable and explosive, which poses a threat to the safety and health of operators; (5) toluene content is 0.8% in the waste water produced in the azeotropic rectification process, polluting Big
The existence of the above problems has seriously hindered the industrialization of trifluoroethanol

Method used

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  • Method for extracting and separating trifluoroethanol and water azeotrope by using porous ionic liquid

Examples

Experimental program
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Effect test

Embodiment 1

[0026] This embodiment relates to a group of extraction agents used for extracting and separating trifluoroethanol and water, and its components are as follows:

[0027] porous ionic liquid Example 1.1 Porous Ionic Liquid Formed by Combining 1-Butyl-3-Methylimidazolium Bistrifluoromethanesulfonimide and ZIF-8 Example 1.2 Porous Ionic Liquid Formed by Combining 1-Hexyl-3-Methylimidazolium Bistrifluoromethanesulfonimide and ZIF-8 Example 1.3 Porous ionic liquid formed by combining n-ethylpyridine bistrifluoromethanesulfonimide with ZIF-8 Example 1.4 Porous ionic liquid formed by combining n-butylpyridine bistrifluoromethanesulfonimide with ZIF-8

[0028] The above-mentioned imidazole or pyridine porous ionic liquid extractant is taken as an example in Example 1.4, and the following preparation method is adopted: pyridine and brominated n-butane are reacted in an absolute ethanol solvent with a molar ratio of 1:1 to generate bromide ionic ...

Embodiment 2

[0032] In the method for extracting and separating trifluoroethanol and water in this embodiment, the extraction conditions are limited as shown in the table below.

[0033]

Embodiment 3

[0035] The method for extracting trifluoroethanol and water with the porous ionic liquid of this embodiment, the extraction conditions and experimental results are shown in the table below.

[0036] Extracting agent Stirring time min Standing time min Extraction efficiency% Example 3.1 Example 2.1 30 30 85.4 Example 3.2 Example 2.2 60 60 88.9 Example 3.3 Example 2.3 120 120 89.3 Example 3.4 Example 2.4 60 60 87.8 Example 3.5 Example 2.5 60 60 90.6 Example 3.6 Example 2.6 120 120 91.8 Example 3.7 Example 2.7 60 60 88.2 Example 3.8 Example 2.8 60 60 92.3 Example 3.9 Example 2.9 120 120 93.8 Example 3.10 Example 2.10 60 60 90.1 Example 3.11 Example 2.11 60 60 94.8 Example 3.12 Example 2.12 120 120 96.9

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Abstract

The invention relates to a method for extracting and separating trifluoroethanol and water azeotrope by using a porous ionic liquid, which comprises the following steps: combining an MOF material ZIF-8 with imidazole and pyridine ionic liquid to form the porous ionic liquid, and extracting and separating trifluoroethanol and water by using the porous ionic liquid as an extracting agent to obtain an upper-layer water phase and a lower-layer porous ionic liquid phase; and extracting the upper-layer water phase by using the porous ionic liquid, and circularly extracting for 5 times, so that the content of the trifluoroethanol in the upper-layer water phase is almost zero, and the effective separation of the trifluoroethanol and the water is realized. performing, by using ethyl acetate, back extraction on the lower-layer porous ionic liquid phase, continuously adding trifluoroethanol and water with the same proportion into the back-extracted lower-layer porous ionic liquid phase for extraction, wherein the porous ionic liquid still shows very high extraction and separation capacity after 8 times of cyclic extraction. The ZIF-8 and the ionic liquid used in the invention are simple and convenient to prepare, wherein the porous ionic liquid extraction agent is high in extraction efficiency, high in cyclic extraction capacity, environment-friendly and reusable, the extraction process is low in energy consumption, and the recovery rate of trifluoroethanol can reach 96.9%.

Description

technical field [0001] The invention belongs to the technical field of chemical separation, and in particular relates to a method for extracting and separating trifluoroethanol and water azeotrope by using porous ionic liquid as an extractant. Background technique [0002] Trifluoroethanol (TFE) is an important fluorine-containing fine chemical. It is a key intermediate in fluorine-containing medicine and agronomic synthesis, and it is also an advanced solvent for some polymer materials. It is also an excellent thermal working medium, which is used in waste heat recovery cycle and absorption refrigeration cycle. During the application and production of trifluoroethanol, an aqueous solution of TFE will be produced, and trifluoroethanol and water will form a minimum azeotrope. Azeotropic distillation, extractive distillation, and liquid-liquid extraction have been used to selectively remove compounds from azeotropic mixtures. Liquid-liquid extraction is a common method for s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C29/86C07C31/38
CPCC07C29/86C07C31/38
Inventor 徐冬梅位凤高军马艺心张连正赵萍萍
Owner SHANDONG UNIV OF SCI & TECH
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