A supercritical fluid complexation reaction device with online spectrum monitoring function

Abstract

The invention belongs to the research field of separation of actinide series elements and lanthanide series elements by a supercritical fluid. In order to overcome the disadvantages of an existing supercritical fluid complex reaction device, the invention provides a supercritical fluid complex reaction device with an online spectrum monitoring function. The device comprises a CO2 storage bottle, a refrigerator, a gas pump, a reaction kettle, a magnetic stirrer, a constant-temperature box, a temperature sensor, a light source, a spectrograph, a data processing system, a reagent bottle, a metering pump and a receiving bottle; and the reaction kettle comprises a kettle body, a kettle cover and a kettle pressing cap. The supercritical fluid complex reaction device provided by the invention has the advantages of rapid supercritical complex reaction speed, capability of rapidly acquiring high-quality spectrum monitoring data, convenience for accurately adding materials and accurately controlling temperatures, high reliability and the like; and application researches of the extraction and separation of the actinide series elements and lanthanide series elements by supercritical CO2.

Description

technical field [0001] The invention belongs to the research field of supercritical fluid extraction and separation of actinides and lanthanides, and in particular relates to a supercritical fluid complexation reaction device with an online spectrum monitoring function. Background technique [0002] Supercritical CO 2 Non-toxic, non-flammable, stable in radiation and chemical properties, it is a green solvent that has attracted much attention and is used to replace organic solvents. Supercritical CO with complexing agent 2 Actinides and lanthanides can be extracted from aqueous solutions, solid substrates, ionic liquids, and solid oxides, and can greatly reduce the volume of radioactive secondary waste liquid. [0003] Research on supercritical CO 2 The separation of actinides and lanthanides, as well as actinides, is of great significance for the popularization and application of this technology. For online monitoring of supercritical CO 2 For the complexation reaction...

AI Technical Summary

Problems solved by technology

First, the volume of the reactor is small, and it is mainly used to study the spectrum of the complex product, which is difficult to apply to the research on the reaction of constant solid nitrate and complexing agent.

Second, the reactor body is sealed with a flange, which requires a high balance of bolt tightening around the body, so it is inconvenient to open and seal the reactor body, and the sealing reliability is low

Thirdly, electric heating mantle or electric heating belt is mostly used for heating the reactor body, which has the problem of uneven heating temperature, while supercritical CO 2 The system is highly sensitive to temperature, so it is difficult to meet the temperature control requirements

Fourth, the internal structure of the reactor is unreasonable, which is not conducive to the rapid progress of the complexation reaction

Fifth, there is the problem of window material contamination caused by the attachment of solid salt reactants, which affects spectral monitoring; if the problem of window material contamination is alleviated by increasing the distance between the incident window and the exit window, due to the limitation of the spectrometer, only Monitoring of low-concentration reactions, while monitoring of high-concentration reactions is powerless

[0006] Based on the above situation, in order to overcome the shortcomings of the existing supercritical fluid complexation reaction device with online spectrum monitoring function, it is better to meet the requirements of supercritical CO 2 For the application research of extraction and separation of actinides and lanthanides, it is necessary to develop a suitable supercritical fluid complexation reaction device

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