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Method and system for removing trace moisture in ionic liquid with weak water absorption

A technology of ionic liquid and trace moisture, applied in the direction of liquid separation, separation method, immiscible liquid separation, etc., can solve the problems of high vacuum degree, reduction of difficult water content, degradation of ionic liquid, etc., and achieve convenient operation and structure Simple, low energy consumption effect

Active Publication Date: 2020-05-29
浙江蓝德能源科技发展有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The traditional method of water removal is to heat the ionic liquid under vacuum, especially at 60-120°C and 133-665Pa pressure, the removal of water usually takes (12-48) hours, and the traditional water removal method has at least some disadvantages : (1) In the dehydration process, the vacuum degree is very high, because the processing time is long, it needs a lot of energy and energy consumption; (2) When the temperature is kept at a higher level for a long time (about 10 hours) (3) It is difficult to reduce the water content to a lower value (below 50ppm) by heating

Method used

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  • Method and system for removing trace moisture in ionic liquid with weak water absorption

Examples

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Embodiment 1

[0025] like figure 1 A system for removing trace amounts of water in weakly hygroscopic ionic liquids is shown (such as figure 1 shown), including an inert gas storage tank 1, a heating and stirring tank 2, an absorption tower 3, a hydrophilic ionic liquid recovery tank 4 and a hydrophilic ionic liquid storage tank 5, and the outlet of the inert gas storage tank passes through the pipeline and the heating and stirring tank The inlet is connected, the outlet end of the pipeline connecting the outlet of the inert gas storage tank and the inlet of the heating and stirring tank is located below the liquid level in the heating and stirring tank, and the pipeline connecting the outlet of the inert gas storage tank and the inlet of the heating and stirring tank is connected with a mass flow meter 6 With the first trace moisture analyzer 7, the outlet at the top of the heating and stirring tank is connected to the lower inlet of the absorption tower through a pipeline, and the second ...

Embodiment 2

[0028] The system for removing trace moisture in the weakly water-absorbing ionic liquid used in this example is exactly the same as that in Example 1, so it will not be repeated here.

[0029] The inert gas (argon) in the inert gas storage tank is passed into the weakly water-absorbing ionic liquid with a temperature of 100°C and a water content of 5000ppm in the heated and stirred tank from the bottom of the heated and stirred tank by bubbling. Make the inert gas fully contact with the weakly water-absorbing ionic liquid (1-ethyl-3-methylimidazole ethyl sulfate salt), and bubble for 7 hours until the water content in the weakly water-absorbing ionic liquid is 50ppm; The inert gas going out enters the absorption tower from the bottom of the absorption tower, and the hydrophilic ionic liquid (1-butyl-3-methylimidazole acetate and 1-butyl-3-methylimidazole in the hydrophilic ionic liquid recovery tank imidazole phosphate diethyl ester salt (mixed according to the mass ratio of ...

Embodiment 3

[0031]The system for removing trace moisture in the weakly water-absorbing ionic liquid used in this example is exactly the same as that in Example 1, so it will not be repeated here.

[0032] The inert gas (nitrogen) in the inert gas storage tank is passed into the weakly water-absorbing ionic liquid with a temperature of 80°C and a water content of 2000ppm from the bottom of the heating and stirring tank in a bubbling manner. The inert gas is in full contact with the weakly water-absorbing ionic liquid (1-ethyl-3-methylimidazolium ethyl sulfate salt), bubbling for 5 hours until the water content in the weakly water-absorbing ionic liquid is 46ppm; escape from the heating and stirring tank The inert gas enters the absorption tower from the bottom of the absorption tower, and the hydrophilic ionic liquid (1-butyl-3-methylimidazole methyl sulfate) in the hydrophilic ionic liquid recovery tank sprays down from the upper part of the absorption tower, In contact with the inert gas...

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Abstract

The invention discloses a method for removing trace moisture in an ionic liquid with weak water absorption. The method comprises the following specific steps: introducing an inert gas into the ionic liquid with weak water absorption from the bottom in a bubbling manner to carry out entrainment dehydration on the ionic liquid with weak water absorption, enabling the inert gas escaped from the ionicliquid with weak water absorption to make contact with a hydrophilic ionic liquid for adsorption and dehydration, then introducing the inert gas into the ionic liquid with weak water absorption againfor use, and regenerating and dehydrating the hydrophilic ionic liquid after water absorption for reuse. The method for removing the trace moisture in the ionic liquid with weak water absorption cangreatly shorten the water removal time, has a good water removal effect, does not pollute the ionic liquid and is low in energy consumption. The invention further discloses a system for removing the trace moisture in the ionic liquid with weak water absorption. The system comprises an inert gas storage tank, a heating stirring tank, an absorption tower, a hydrophilic ionic liquid recovery tank anda hydrophilic ionic liquid storage tank. The system for removing the trace moisture in the weak water absorption ionic liquid is simple in structure and convenient to operate.

Description

technical field [0001] The invention relates to the technical field of ionic liquids, in particular to a method and system for removing trace moisture in weakly water-absorbing ionic liquids. Background technique [0002] Ionic liquids (ILs) are molten salts composed of anions and cations that are liquid at room temperature or near room temperature, and have many excellent properties, such as low melting point, low vapor pressure, high thermal stability, and wide electrochemical window. It has been applied in many fields such as separation and extraction, electrochemistry, organic reaction, material preparation, etc. During the synthesis, storage and use of ionic liquids, the introduction of water is unavoidable. For example, in the publication numbers CN101679292A and CN102906126A, the method of washing with water is used to remove salt and impurities. A little water will be introduced in this process. Its water content is mostly higher than 500ppm. [0003] The existence...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D17/035B01D17/02B01D17/09B01D1/00B01D1/30C07D233/58
CPCB01D17/0205B01D17/02B01D1/00B01D1/30C07D233/58Y02P20/54
Inventor 任旭华周翔王宏达徐国锐沈珏锋独孤光海
Owner 浙江蓝德能源科技发展有限公司