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A kind of method for extracting and separating trifluoroethanol and water azeotrope with 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 heavy pollution, high energy consumption, and impact on human health

Active Publication Date: 2022-07-19
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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  • A kind of method for extracting and separating trifluoroethanol and water azeotrope with porous ionic liquid

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Effect test

Embodiment 1

[0026] The present embodiment relates to a group of extractants 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-methylimidazole bistrifluoromethanesulfonimide with ZIF-8 Example 1.2 Porous ionic liquid formed by combining 1-hexyl-3-methylimidazole bistrifluoromethanesulfonimide with ZIF-8 Example 1.3 Porous ionic liquid formed by n-ethylpyridine bistrifluoromethanesulfonimide combined with ZIF-8 Example 1.4 Porous ionic liquid formed by n-butylpyridinebistrifluoromethanesulfonimide combined with ZIF-8

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

Embodiment 2

[0032] In the method for the extraction and separation of trifluoroethanol and water by porous ionic liquid in this embodiment, the extraction conditions are limited as shown in the following table.

[0033]

Embodiment 3

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

[0036] Extracting agent stirring time min Rest 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 porous ionic liquid. The MOF material ZIF-8 is combined with imidazole and pyridine ionic liquid to form a porous ionic liquid, and the porous ionic liquid is used as an extracting agent for extraction. The trifluoroethanol and water are separated to obtain the upper water phase and the lower porous ionic liquid phase, the upper water phase is extracted with the porous ionic liquid, and the cyclic extraction is performed 5 times. The trifluoroethanol content in the upper water phase is almost zero, and the three Efficient separation of fluoroethanol and water. Then use ethyl acetate to carry out back extraction on the lower porous ionic liquid phase, and continue to add trifluoroethanol and water in the same proportion to the lower porous ionic liquid phase after back extraction for extraction. Shows strong extraction and separation ability. The preparation of ZIF-8 and ionic liquid used in the present invention is simple and convenient. The porous ionic liquid extractant has high extraction efficiency, strong cyclic extraction ability, environmental friendliness and can be reused, the extraction process consumes less energy, 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 for fluorine-containing medicine and agronomic synthesis, a high-grade solvent for some polymer materials, and an excellent thermal working fluid for waste heat recovery cycle and absorption refrigeration cycle. During the application and production of trifluoroethanol, an aqueous solution of TFE is produced, and trifluoroethanol and water form a minimum azeotrope. Azeotropic rectification, extractive rectification, and liquid-liquid extraction have been used to selectively remove compounds from azeotropes. Liquid-liquid extraction is a common method for separating azeotropes and is carried out at room temp...

Claims

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Application Information

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Patent Type & Authority Patents(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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