Supercritical carbon dioxide experimental equipment

Abstract

The invention relates to supercritical carbon dioxide experimental equipment, which comprises a carbon dioxide gas cylinder, a cold trap, a high-pressure metering pump, a gas inlet micrometering valve and a high-pressure container, wherein a gas inlet tube, a thermoelectric couple sleeve and a discharge tube penetrate through a top cover of the high-pressure container; a polytetrafluoroethylene magnetic force stirrer is arranged at the bottom of the high-pressure container, and a magnetic force stirring controller is arranged on the outer part below the high-pressure container; and the high-pressure container is arranged in a constant temperature cavity of a constant temperature device. In addition, the output end of the discharge tube is communicated to a material collector by a discharge micrometering valve. The supercritical carbon dioxide experimental equipment is suitable for a supercritical carbon dioxide extraction technology, chemical reaction in supercritical carbon dioxide, the purification of crude products in the supercritical carbon dioxide, and the measurement of phase equilibrium and melting points of solutes in the supercritical carbon dioxide. The supercritical carbon dioxide experimental equipment has the characteristic of simple structure, and is suitable for multiple supercritical carbon dioxide experiments.

Description

technical field [0001] The invention relates to the field of chemical machinery, more specifically, relates to a kind of equipment that can be used for various supercritical carbon dioxide experiments. Background technique [0002] As a special solvent, supercritical fluid has very special properties. For example, its density is hundreds of times that of gas, close to liquid, so it has strong dissolving ability; its viscosity is equivalent to that of gas, and its diffusion coefficient is hundreds of times larger than that of liquid, close to gas, so it dissolves in supercritical fluid Diffusion of substances is very easy and the penetration ability is very strong. Near the critical point, the density of a supercritical fluid varies greatly with temperature, especially pressure (thus its solvency varies greatly with temperature, especially pressure), which can be hundreds or even thousands of times. These unique balance and transfer properties of supercritical fluids, as we...

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Problems solved by technology

[0005] At present, the supercritical technology used to purify the crude product is supercritical extraction technology. This treatment method generally extracts the reactant from the product. The reactant should have good solubility in supercritical carbon dioxide, that is, the operation process requires higher pressure (generally greater than 20MPa) and temperature and a longer time, and the consumption of carbon dioxide is also larger.

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