Supercritical fluid expansion-decompression method for preparing superfine powder

Abstract

The invention is a supercritical fluid-swelling decompressing method to make ultrafine powder body. It dissolves the raw material as solute in the organic solvent to form the solution. It selects a supercritical fluid, where the fluid can dissolve the solute and the fluid and the organic solvent can mutually dissolve. It mixes the fluid with the solution to form uniform multielement codissolved mixture, which is quickly decompressed to swell through spray nozzle, wherein the solute is separated out in the ultrafine particle mode to form the finished product. It can be widely applied to food, drugs, chemical industry, make-up industry, etc.

Description

technical field

[0001] The invention belongs to the field of materials and relates to the preparation of ultrafine powder materials, in particular to a supercritical fluid expansion and decompression method for preparing ultrafine powder materials. Background technique

[0002] The development of supercritical fluid technology provides a new way for the preparation of ultrafine powder materials. Existing methods for preparing superfine powders using supercritical fluid technology include rapid expansion of supercritical fluid solutions and supercritical antisolvent methods. The supercritical solution rapid expansion method is that the raw material to be prepared into ultrafine powder is dissolved in the supercritical fluid as a solute to form a supercritical solution, and the solution is rapidly decompressed and expanded through the nozzle, so that the solution reaches When the degree of supersaturation is extremely high, the solute in it will be precipitated in the form of...

Examples

Embodiment Construction

[0013] Specific embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0014] The organic solvent enters the dissolution tank 4 after being pressurized and heated by the organic inlet 1 through the solvent pump 2 and the solvent heater 3 successively. Here, the organic solvent with a certain pressure and temperature dissolves the solute (the raw material to be made into ultrafine powder) filled in the dissolution tank to form a solution with a certain concentration, and then enters the mixing tank 6 . At the same time, supercritical CO 2 via CO 2 Inlet 5 enters mixing tank 6 . Here, the solution was mixed with supercritical CO 2 After mixing, a homogeneous multi-element eutectic mixture is formed, and the mixture enters the precipitation tank 8 through a decompression device 7 (such as a decompression valve). In the precipitation tank 8, the multi-component eutectic mixture rapidly decompresses and expands th...

technical field

[0001] The invention belongs to the field of materials and relates to the preparation of ultrafine powder materials, in particular to a supercritical fluid expansion and decompression method for preparing ultrafine powder materials. Background technique

[0002] The development of supercritical fluid technology provides a new way for the preparation of ultrafine powder materials. Existing methods for preparing superfine powders using supercritical fluid technology include rapid expansion of supercritical fluid solutions and supercritical antisolvent methods. The supercritical solution rapid expansion method is that the raw material to be prepared into ultrafine powder is dissolved in the supercritical fluid as a solute to form a supercritical solution, and the solution is rapidly decompressed and expanded through the nozzle, so that the solution reaches When the degree of supersaturation is extremely high, the solute in it will be precipitated in the form of...

Examples

Embodiment Construction

[0013] Specific embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0014] The organic solvent enters the dissolution tank 4 after being pressurized and heated by the organic inlet 1 through the solvent pump 2 and the solvent heater 3 successively. Here, the organic solvent with a certain pressure and temperature dissolves the solute (the raw material to be made into ultrafine powder) filled in the dissolution tank to form a solution with a certain concentration, and then enters the mixing tank 6 . At the same time, supercritical CO 2 via CO 2 Inlet 5 enters mixing tank 6 . Here, the solution was mixed with supercritical CO 2 After mixing, a homogeneous multi-element eutectic mixture is formed, and the mixture enters the precipitation tank 8 through a decompression device 7 (such as a decompression valve). In the precipitation tank 8, the multi-component eutectic mixture rapidly decompresses and expands th...

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