Background and Overview
Benzo-15-crown-5, also known as benzo-15-crown-5, is a chemical substance.
Apply [1-3]
1. Used in sol-gel material extraction and separation of lithium isotopes
There are currently many methods used for lithium isotope separation, which can be roughly divided into chemical methods and physical methods. Physical methods include molten salt electrolysis, electron migration, electromagnetic methods, molecular distillation, laser separation, etc. Although these physical methods can enrich lithium isotopes to a higher purity, their yields are limited and cannot be applied to large-scale industrial needs. Chemical methods include lithium amalgam method, ion exchange method, extraction method, etc. Currently, the lithium amalgam method is the only lithium isotope separation method used in industrial production. However, the use of large amounts of mercury in this production process has caused serious environmental and safety problems. Therefore, finding other safe and efficient lithium isotope separation methods has become a research hotspot in various countries. CN201410067632.X provides a new lithium isotope extraction and separation method, which is green and environmentally friendly and has good lithium isotope separation efficiency. After extensive research and repeated experiments, the inventor found that hydrophobic benzo-15-crown-5 and hydrophobic ionic liquid were used as the extraction agent and co-extraction agent respectively to prepare sol-gel materials to extract lithium isotopes. During the extraction process, benzo-15-crown-5, ionic liquids and lithium ions form a stable ionic association, extracting lithium from the aqueous phase into the solid phase, and producing a significant isotope separation effect. The inventor further optimized and selected extraction conditions such as lithium salt, extraction agent, and co-extraction agent to achieve efficient green separation of lithium isotopes, and enabled the ionic liquid and extraction agent used in the extraction process to be reused, reducing production cost, thereby completing the present invention.
2. Used to make formic acid gas static detection sensors
Formic acid is a common volatile organic pollutant in residential areas and industrial production areas. Sensitive monitoring of trace amounts of formic acid gas is of great significance. CN201220548933.0 provides a static detection sensor for formic acid gas. The sensor is simple in equipment and easy to operate, and can accurately measure the concentration of formic acid gas within a few minutes. In order to achieve the above purpose, the technical solution adopted by this utility model is: a formic acid gas static detection sensor, which is characterized in that: the coating material coated on the piezoelectric quartz crystal sensor is benzo-15-crown-5/phthalic acid The ratio of dinonyl ester is 0.1~10:1, and the amount of coating material benzo-15crown-5/dinonyl phthalate applied on the piezoelectric quartz crystal sensor is 5~50 μg. The coating material applied on the piezoelectric quartz crystal sensor is benzo-15-crown-5/nonyl phthalate, with a ratio of 0.1~10:1. It can be highly sensitive and selective through hydrogen bonding. adsorbs formic acid gas. The sensor can conveniently and accurately measure the concentration of formic acid gas through the static equilibrium adsorption method. The entire device is assembled from the above components, which is easy to disassemble and replace, and is easy to carry. It is characterized by the design and application of static detection sensors and the use of benzo-15-crown-5/nonyl phthalate, which has a specific adsorption function for formic acid gas. Through a large amount of experimental data, it was found that the amount of coating material benzo-15-crown-5/dinonyl phthalate applied on the piezoelectric quartz crystal sensor is 5~50 μg. Its main working principle is that formic acid gas can be selectively adsorbed on the sensitive coating material. The resulting small mass changes will change the resonant frequency of the sensor. The frequency change value is used to calculate the concentration of formic acid gas in the measured gas sample. concentration. The utility model has the beneficial effects that it can accurately and quickly measure the concentration of formic acid gas, and the sensor structure is simple, and the detection process saves time and effort, and is very convenient.
3. Extraction system for extracting lithium isotopes
The crown ether extraction method mainly utilizes the difference in the chelating properties of the neutral chelating extractant crown ether for the isotopes 6Li and 7Li during the extraction process. A chemical exchange method that realizes isotope exchange and enrichment in the exchange process. Since Jepson reported on the use of macrocyclic polyethers for liquid-liquid extraction of lithium isotopes at the American Conference on Separation Science and Technology, and found that its single-stage separation coefficient is close to that of the lithium amalgam method, a large number of reports have been published on the extraction of lithium isotopes by crown ethers. Research work on the system has been carried out, but the distribution coefficients of lithium in the reported crown ether extraction systems are all small. Therefore, from the perspective of single-stage separation coefficient, crown ether system extraction and separation of lithium isotopes is a promising separation method. CN201510952278.3 provides an extraction system for extracting lithium isotopes, which is used to extract and separate lithium isotopes enriched in aqueous phase using an extraction organic phase. The extraction organic phase includes: an extraction agent, a hydrophobic ionic liquid and a diluent. agent, the volume ratio of the hydrophobic ionic liquid and the diluent is 1~15:1~10; the concentration of the extraction agent in the extraction organic phase is 0.05~2.5mol/L; the extraction agent is At least one of benzo-15-crown-5 and its derivatives, or benzo-14-crown-4 and its derivatives.
Main reference materials
[1] CN201410067632.X A method for extracting and separating lithium isotopes from sol-gel materials
[2] CN201220548933.0 Formic acid gas static detection sensor
[3] CN201510952278.3 An extraction system for extracting lithium isotopes
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