Floating type high-extraction-rate supercritical extraction system for traditional Chinese medicine preparation

Abstract

The invention discloses a floating type high-extraction-rate supercritical extraction system for traditional Chinese medicine preparation, and belongs to the field of supercritical extraction.The floating type high-extraction-rate supercritical extraction system for traditional Chinese medicine preparation is characterized in that a plurality of bidirectional floating flexible frames which penetrate through supercritical fluid containing extracts and float on the liquid level of the supercritical fluid are arranged. When temperature rise and pressure reduction are carried out to remove carbon dioxide, a self-elevating expansion ball is heated to expand in volume and can float upwards, at the moment, a spiral movable rod can be driven to longitudinally move upwards in supercritical fluid containing the extract, so that a certain stirring effect is generated on the supercritical fluid containing the extract. Meanwhile, under the impact of the overflowing gaseous carbon dioxide, the spiral movable rod can transversely swing, the stirring amplitude is further increased, the overflowing speed of the gaseous carbon dioxide is increased, and compared with the gaseous carbon dioxide automatic release process in the prior art, the time needed by medicine extraction is shortened, and the overall pharmaceutical efficiency is obviously improved.

Description

technical field [0001] The invention relates to the field of supercritical extraction, in particular to a floating high extraction rate supercritical extraction system for preparing traditional Chinese medicine. Background technique [0002] The state in which the pressure and temperature of a substance exceed its critical pressure (Pc) and critical temperature (Tc) at the same time, or the state in which the relative pressure (P / Pc) and relative temperature (T / Tc) of a substance are greater than 1 at the same time is called The supercritical state of the substance. There are three phases of any kind of matter—gas, liquid, and solid. The point at which the liquid and gas phases are in equilibrium is called the critical point. The temperature and pressure at the critical point are called the critical temperature and critical pressure (the critical temperature and critical pressure of water are 374°C and 21.7MPa, respectively). Different substances require different pressur...

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Problems solved by technology

[0005] Supercritical carbon dioxide extraction is to change carbon dioxide into supercritical fluid, use carbon dioxide supercritical fluid as a solvent to dissolve the substances to be extracted, and then change the carbon dioxide in the supercritical fluid into gaseous carbon dioxide by raising the temperature and reducing the pressure, so that the obtained The extract is more pure, so many medicines are extracted in this way, so that the obtained extract does not contain other impurities. In this process, although the temperature rise will accelerate the release of carbon dioxide, the release of carbon dioxide is an autonomous release, so the release speed Relatively slow, resulting in a relatively long time for the entire drug extraction process, resulting in low efficiency of drug extraction

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