Corrosion-resistant multi-working-mode supercritical carbon dioxide extraction system

Abstract

The invention discloses a corrosion-resistant multi-working-mode supercritical carbon dioxide extraction system. The corrosion-resistant multi-working-mode supercritical carbon dioxide extraction system comprises an installation rack, a high pressure constant-flux pump, a control cabinet, a carbon dioxide pump, a preheating mixer, a first constant temperature extraction kettle, a second constant temperature extraction kettle, a gas liquid separator, a constant temperature water tank, a high pressure carbon dioxide steel cylinder, a storage tank, and a low pressure circulating pump. When the corrosion-resistant multi-working-mode supercritical carbon dioxide extraction system is used for polluted soil leaching decontamination, cooperation using of a first valve, a second valve, a third valve, a fourth valve, and a fifth valve is adopted, a plurality of working modes can be selected, the appropriate working mode can be selected based on different requirements, working mode is flexible and selective, research time is saved effectively, and more scientific research data is obtained at the same time; the first constant temperature extraction kettle and the second constant temperature extraction kettle are provided with hastelloy inner liner polytetrafluoroethylene layers, and long lasting strong acid corrosion resistance at high temperature under high pressure is achieved.

Description

technical field [0001] The invention relates to the field of nuclear environmental science, in particular to a corrosion-resistant multi-working mode supercritical carbon dioxide extraction system. Background technique [0002] Research on the decontamination of radioactive solid pollutants has always been valued by people. As an efficient separation technology, supercritical extraction (SFE), especially supercritical CO2, has a lower critical condition (31.3°C, 7.4MPa) It is widely used in the decontamination and separation of organic pollutants and heavy metals in solid-phase environmental media. In recent years, the United States, Japan, Russia, the United Kingdom, and South Korea have all carried out research on SFE for nuclear waste decontamination and spent fuel reprocessing, confirming that SFE has the potential to be applied to nuclear waste decontamination and has its unique advantages. However, commercial supercritical extraction devices are mostly used in the res...

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Problems solved by technology

However, commercial supercritical extraction devices are mostly used in the research of organic and biomedical fields, and in the decontamination of radioactive solid waste. The structure of the extraction system is simple, and the materials of the extraction kettle are resistant to corrosion under long-term high temperature and high pressure (especially is strong acid corrosion) and the anti-adsorption performance of nuclide is not high enough, it is difficult to meet the needs of scientific research

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