CN-122006419-A - Hydrophobic eutectic solvent and preparation method and application thereof

Abstract

The application provides a hydrophobic eutectic solvent, a preparation method and application thereof, and belongs to the field of analytical chemistry. The preparation method of the hydrophobic eutectic solvent comprises the steps of mixing the hydrogen bond acceptor and the hydrogen bond donor according to the molar ratio of 1:1-2:1, and stirring at 90-100 ℃ until homogeneous liquid is formed, so as to obtain the hydrophobic eutectic solvent. The hydrophobic eutectic solvent, the preparation method and the application thereof can solve the problems of low absorption efficiency, poor regeneration performance, poor environmental protection and insufficient industrialization suitability of the existing absorbent for alkane VOCs treatment.

Inventors

• ZHAO YAN
• CHEN LI
• CHEN DONGZHI
• Lai Zongjia
• CHEN YINGZHE

Assignees

• 浙江海洋大学

Dates

Publication Date

20260512

Application Date

20260414

Claims (10)

1. 1. The hydrophobic eutectic solvent is characterized by comprising a hydrogen bond acceptor and a hydrogen bond donor according to a molar ratio of 1:1-2:1, wherein the hydrogen bond acceptor is selected from one of capric acid and lauric acid, and the hydrogen bond donor is 2-hexyl-1-decanol.
2. 2. The hydrophobic eutectic solvent of claim 1, wherein the hydrogen bond acceptor is decanoic acid, and the molar ratio of decanoic acid to 2-hexyl-1-decanol is 1:1.
3. 3. The hydrophobic eutectic solvent of claim 1, wherein the hydrogen bond acceptor is decanoic acid, and the molar ratio of decanoic acid to 2-hexyl-1-decanol is 2:1.
4. 4. The hydrophobic eutectic solvent of claim 1, wherein the hydrogen bond acceptor is lauric acid, and the molar ratio of lauric acid to 2-hexyl-1-decanol is 1:1.
5. 5. The hydrophobic eutectic solvent of claim 1, wherein the hydrogen bond acceptor is lauric acid, and the molar ratio of lauric acid to 2-hexyl-1-decanol is 2:1.
6. 6. A method for preparing the hydrophobic eutectic solvent according to any one of claims 1 to 5, wherein the method comprises: And mixing the hydrogen bond acceptor and the hydrogen bond donor according to a molar ratio of 1:1-2:1, and stirring at 90-100 ℃ until a homogeneous phase liquid is formed, so as to obtain the hydrophobic eutectic solvent.
7. 7. Use of a hydrophobic eutectic solvent according to any of claims 1-5 as an absorbent for absorbing n-pentane, n-hexane, n-heptane in exhaust gases.
8. 8. The use according to claim 7, wherein the contact temperature during the absorption process is 20-40 ℃, and the hydrophobic eutectic solvent is directly mixed and contacted with the waste gas containing n-pentane, n-hexane and n-heptane.
9. 9. The use according to claim 7, wherein the hydrophobic eutectic solvent after alkane absorption is regenerated by vacuum heating, and the regenerated hydrophobic eutectic solvent is used for re-absorbing n-pentane, n-hexane and n-heptane in the exhaust gas.
10. 10. The use according to claim 9, wherein the absorption capacity of n-pentane, n-hexane, n-heptane after 10 consecutive desorption-absorption cycles of the hydrophobic eutectic solvent remains above 99% of the absorption capacity of the fresh hydrophobic eutectic solvent.

Description

Hydrophobic eutectic solvent and preparation method and application thereof Technical Field The application relates to the technical field of analytical chemistry, in particular to a hydrophobic eutectic solvent and a preparation method and application thereof. Background Alkane Volatile Organic Compounds (VOCs) such as n-pentane, n-hexane, n-heptane and the like are typical atmospheric pollutants generated in the production process of industries such as petrochemical industry, coating printing, rubber processing, fine chemical industry and the like, have high volatility and high toxicity, not only pollute the atmospheric environment, but also harm the physiological functions of human respiratory systems, nervous systems and the like, and are also important precursors for forming secondary pollutants such as ozone, fine particles (PM 2.5) and the like, thus being important management and control objects for the atmospheric pollution control of China. In addition, n-pentane, n-hexane and n-heptane are used as important industrial solvents and chemical raw materials, and have higher resource recovery value, so that the development of efficient, environment-friendly and recyclable alkane VOCs treatment technology realizes standard emission and resource recovery of the alkane VOCs, and becomes urgent requirement for industry development. At present, the industrial treatment methods for alkane VOCs mainly comprise an absorption method, an adsorption method, a catalytic combustion method and the like, wherein the absorption method is a mainstream technology for treating low-concentration and high-flow alkane VOCs waste gas due to the advantages of simple process, convenient operation, low treatment cost, capability of realizing resource recovery and the like, and the core of the absorption method is the choice of an absorbent. The conventional absorbent commonly used in alkane VOCs absorption treatment mainly comprises adsorption materials such as silicone oil solvents, traditional organic solvents, ionic eutectic solvents, active carbon and the like, wherein the eutectic solvents become research hot spots in recent years due to the characteristics of low melting point, strong thermal stability, strong designability and the like. Aiming at alkane nonpolar VOCs, hydrophobic eutectic solvents are prepared by screening hydrophobic components in the prior art to improve compatibility with alkane, and corresponding solvent preparation process and absorption regeneration process are developed in a matched manner to try to solve inherent defects of the traditional absorbent. However, the existing alkane VOCs absorbent and the matched preparation and application process still have a plurality of technical defects, and are difficult to meet the requirements of industrial practical application, and the specific defects are that the absorption efficiency is insufficient, the polarity matching degree of traditional absorbents such as silicone oil, short-chain solvents and the like and alkane nonpolar VOCs is low, the gas-liquid distribution coefficient is high, the solubility and the absorption capacity of alkane are low, and the problem that the absorption capacity of nonpolar alkane is poor due to the fact that part of ionic eutectic solvents are strong in polarity and cannot realize high-efficiency treatment. The silicone oil absorbent has the advantages of poor regeneration performance and circulation stability, rapid attenuation of absorption performance after multiple analysis-absorption circulation, low regeneration rate, excessively high strength of hydrogen bond network of ionic eutectic solvent, high temperature and high pressure condition in the regeneration process, easy destruction of the self structure of the solvent, incapability of repeatedly using the solvent, frequent replacement and great improvement of industrial operation cost. The environment protection and safety are poor, part of traditional organic solvents such as halohydrocarbon and the like have toxicity and are easy to volatilize, secondary atmospheric pollution is easy to cause in the use process, the organic solvents are difficult to biodegrade and are easy to cause water and soil pollution, and the synthetic raw materials of part of ionic eutectic solvents are toxic and harmful and do not accord with the production concept of green and environment protection. The method has the advantages of insufficient industrialization suitability, easy crystallization of partial absorbent at normal temperature, overhigh viscosity, poor fluidity, large mass transfer resistance in conventional absorption devices such as industrial spraying, bubbling, filling towers and the like, and poor suitability, and meanwhile, the temperature of the conventional absorption process is not matched with the conventional discharge temperature of industrial waste gas, the energy consumption of the regeneration process is high, and the industrial application value of the tech