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Supercritical fluid expansion-decompression method for preparing superfine powder

A technology of supercritical fluid and ultrafine powder, which is applied in the field of materials to achieve the effect of high product quality and uniform particle size distribution

Inactive Publication Date: 2005-12-28
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to provide a new method for preparing ultrafine powder with supercritical fluid technology, thereby overcoming the shortcomings of the existing supercritical solution rapid expansion method, and obtaining high-quality ultrafine powder with uniform particle size distribution product

Method used

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  • Supercritical fluid expansion-decompression method for preparing superfine powder

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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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Abstract

Supercritical fluid expansion and decompression method for preparing ultrafine powder. The raw material to be prepared into ultrafine powder is dissolved in an organic solvent as a solute to form a solution. Choose a supercritical fluid that can dissolve the solute in the solution and is miscible with the organic solvent in it. After the supercritical fluid is mixed with the solution, a uniform multi-component eutectic mixture is formed, and the multi-component eutectic mixture rapidly decompresses and expands through the nozzle, and the solute in it is precipitated in the form of ultrafine particles to form an ultrafine powder product. The superfine powder prepared by the method has uniform particle size distribution and high product quality. The method can be widely used in the preparation of superfine powder products in industries such as food, medicine, chemical industry and cosmetics.

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...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J2/06
Inventor 李志义刘学武
Owner DALIAN UNIV OF TECH
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