Crystallizing kettle for preparing superfine powder using supercritical anti-solvent process

A technology of ultrafine powder and supercritical fluid, which is applied in the direction of liquid separation into beads and granulation, chemical/physical/physicochemical nozzle reactors, etc. It can solve the problem of large particle size and uneven particle size distribution of ultrafine particles. question

Inactive Publication Date: 2004-09-15
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The existing crystallization kettle is only suitable for experimental research and cannot be used for the production of relatively large quantities of products, and there are shortcomings such as large particle size and uneven particle size distribution of the prepared ultrafine particles.

Method used

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  • Crystallizing kettle for preparing superfine powder using supercritical anti-solvent process
  • Crystallizing kettle for preparing superfine powder using supercritical anti-solvent process

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Embodiment Construction

[0016] Specific embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0017] The first embodiment: the inner nozzle with multiple straight spray holes is suitable for occasions requiring larger output.

[0018] figure 1 The cylindrical inner nozzle 3 is provided with a cylindrical solution chamber 5, and a plurality of penetrating direct injection holes 11 are arranged at the lower end of the chamber wall. These direct injection holes are evenly and axially symmetrically distributed on a conical surface in a radial shape. . The upper end of the cavity wall is connected with the kettle cover 1, and the connection method can be threaded connection, welding and the like. The solution introduction hole 4 is set on the lid of the kettle. The solution cavity 5 of the inner nozzle 3 communicates with the solution introduction hole 4 . The junction of the chamber wall of the inner nozzle 3 and the kettle cover 1 is ...

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Abstract

The invention relates to a crystallizing kettle using the supercritical fluid desolvation course to prepare ultrafine powder, mainly composed of kettle body, material basket, inner and outer spray nozzles, etc. Its character: a penetrable straight spray hole is set on the cavity wall of the inner spray nozzle, and the outer surface of the inner spray nozzle and the inner surface of the outer spray nozzle form a supercritical fluid ringed channel, which gradually shrinks to become narrow to form a narrow and small spray hole. It can evenly disperse the solution into micro liquid drops in the supercritical fluid, so that the product has small grain size and uniformly distributed grains. It is applied to the field where the solvent in the solution can dissolve in the supercritical fluid but the solute in the solution does not dissolve in the supercritical fluid (or the solubility very small).

Description

technical field [0001] The invention belongs to the technical field of chemical machinery, and relates to a device for preparing ultrafine powder, in particular to the design of a crystallization kettle for preparing ultrafine powder through a supercritical antisolvent process. Background technique [0002] There are currently many methods for preparing ultrafine powders from supercritical fluids, such as supercritical solution rapid expansion method (referred to as RESS) and supercritical antisolvent method (referred to as SAS). These methods each have their scope of application, among which SAS The application prospect of the law is more extensive. The principle of the SAS method is: as a solute, the solid material to be made into an ultrafine powder is first dissolved in an organic solvent to form a solution, and then the solution is quickly sprayed into the supercritical fluid in the crystallization tank, because the solute in the solution is insoluble in Supercritical ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J2/06B01J19/26
Inventor 李志义刘学武张晓冬
Owner DALIAN UNIV OF TECH
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