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Basic process flow for preparing superfine powder using supercritical fluid reverse solvent process

A technology of supercritical fluid and ultrafine powder, applied in the field of chemical engineering, can solve the problems of low operation efficiency, large energy consumption, waste of solvent and anti-solvent, etc., and achieve the effect of improving operation efficiency, eliminating waste and reducing energy consumption.

Inactive Publication Date: 2004-12-15
DALIAN UNIV OF TECH
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Problems solved by technology

This process has low operating efficiency, high energy consumption, and serious waste of solvent and anti-solvent, so it is not suitable for industrial production

Method used

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  • Basic process flow for preparing superfine powder using supercritical fluid reverse solvent process

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Embodiment Construction

[0012] The specific implementation manner of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0013] In the basic process of preparing superfine powder by supercritical anti-solvent process, the solvent in solvent tank 1 is boosted by solvent pump 3, then enters dissolution tank 6 or 7, and fully contacts with solid solute in dissolution tank 6 or 7 , forming a solution with a certain concentration, which is heated to a certain temperature by the solution heater 10 and then enters the crystallization tank 13 or 14. At the same time, the antisolvent in the antisolvent storage tank is pressurized and heated by the antisolvent pump 17 and the antisolvent heater 18, reaches a certain pressure and temperature, and enters the crystallization kettle 13 or 14 after becoming a supercritical fluid. In the crystallization tank 13 or 14, the solution with a certain concentration is evenly dispersed in the supercritical fluid in the f...

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Abstract

The present invention relates to basic technological process of preparing superfine powder material. The main technological apparatus includes solvent storage tank, solvent pump, solvent tanks, solution heater, crystallizers, counter-solvent storage tank, counter-solvent pump, counter-solvent heater, decompression unit, separating tank, condenser, etc. The present invention features the solvent tanks and the crystallizers capable of being parallelly connected for periodical operation, and solvent and counter-solvent capable of being used circularly to form semi-continuous closed operation mode. The basic process can raise the operation efficiency, lower power consumption, eliminate waste in solvent and counter-solvent and apply to industrial production.

Description

technical field [0001] The invention belongs to the field of chemical engineering, and relates to a basic process flow, in particular to a basic process flow for preparing superfine powder by using a supercritical fluid anti-solvent process, which is used for the preparation of superfine powder materials. Background technique [0002] In recent years, according to the characteristics of supercritical fluids, some advanced supercritical fluid processes have been developed to prepare ultrafine powders. Among them, the most representative one is the supercritical antisolvent process. The principle of supercritical antisolvent is: the solid solute to be made into ultrafine powder is dissolved in a certain solvent to form a solution, usually an organic solvent, and a supercritical fluid is selected as the antisolvent, usually carbon dioxide. It does not dissolve the solute in the solution, but can be miscible with the solvent. When the anti-solvent is in contact with the solutio...

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Application Information

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IPC IPC(8): B01D9/02
Inventor 李志义刘学武张晓冬
Owner DALIAN UNIV OF TECH
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