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Method for synthesizing ionic liquid of ethanolamine lactate

A kind of technology of ethanolamine lactate and ionic liquid, applied in the field of synthesis of quaternary ammonium salt ionic liquid

Inactive Publication Date: 2012-07-04
NANJING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The main disadvantage of the ionic liquid synthesis method adopted in the above-mentioned patent is that the operation process is relatively cumbersome, and the synthesis reaction time is also long, which is close to one day, which is not conducive to the timely implementation of the properties and performance experiments of the prepared ionic liquid.

Method used

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  • Method for synthesizing ionic liquid of ethanolamine lactate
  • Method for synthesizing ionic liquid of ethanolamine lactate
  • Method for synthesizing ionic liquid of ethanolamine lactate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] 1. Put the rotor in the three-necked microwave special flask, then weigh 0.5mol ethanolamine and 0.55mol lactic acid according to the molar ratio of 1:1.1 and add them to the 100mL microwave special three-necked flask and the balance liquid adder for use;

[0017] 2. Place the three-necked flask containing ethanolamine in a beaker filled with cold water, so that the liquid level of the cold water is slightly higher than the liquid level in the three-necked flask to form a water bath;

[0018] 3. Put the beaker with the three-necked flask into the microwave reactor, and make the three interfaces of the three-necked flask connect with the balance liquid adder and N 2 The air guide tube is connected with a spherical condenser tube;

[0019] 4. Set the microwave power of the microwave reactor to 300w, the reaction temperature to 65°C, and feed N 2 Gas, the flow rate is selected as 0.2L min -1 or 0.3L·min -1 , so that the reactants do not overflow as a limit, and ensure t...

Embodiment 2

[0022] The process steps are the same as in Example 1, except that the molar ratio of ethanolamine and lactic acid added is 0.90:1, the reaction temperature is 25°C, the microwave power and reaction time are 300w and 10min respectively, and the above synthesis steps are repeated. The purified ionic liquid can be obtained, and the calculated yield of this example is 84.37% after weighing.

Embodiment 3

[0024] The process steps are the same as in Example 1, except that the molar ratio of ethanolamine and lactic acid added is 1:1.1, the reaction temperature is 65°C, the microwave power and reaction time are 700w and 10min respectively, and the above synthesis steps are repeated. The purified ionic liquid can be obtained, and the calculated yield of this example is 86.36% after weighing.

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Abstract

The invention relates to the field of chemical engineering, in particular to a method for synthesizing an ionic liquid of ethanolamine lactate used for absorbing SO2 gas. The method is characterized in that: the water-bath microwave method is adopted to prepare the ionic liquid; under the microwave action, the target product can be quickly synthesized; and for the exothermic reaction, the water bath can remove excessive heat, weaken the microwave action, and better control the reaction temperature. The synthesis reaction time of the method is greatly shortened, and the synthesis reaction can be completed in 30 minutes. The ionic liquid of ethanolamine lactate prepared by the method has the advantages of high yield, short balance time, high desulfurizing efficiency and the like, and can be widely used as a fume desulfurizer.

Description

technical field [0001] The invention relates to a method for absorbing SO in the field of chemical industry 2 A method for synthesizing gaseous quaternary ammonium salt ionic liquids, especially a method for synthesizing ethanolamine lactate ionic liquids. Background technique [0002] Ionic liquids are salts composed of organic cations and inorganic or organic anions that are liquid at or near normal temperature. Ionic liquid has low vapor pressure and little pollution to the gas phase. It can replace traditional organic solvents that are volatile and harmful to the environment. It is a kind of organic solvent used to absorb SO 2 new green solvents. [0003] At present, alcohol amine carboxylate ionic liquids are often prepared by traditional synthesis methods. Zhang Suojiang, Institute of Process Technology, Chinese Academy of Sciences, etc. proposed a synthesis method of alcohol amine carboxylate functionalized ionic liquids in Chinese patents 200510069406.6 and 200510...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C215/40C07C215/08C07C213/08
Inventor 钟秦翟林智
Owner NANJING UNIV OF SCI & TECH
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