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Supercritical fluid drying device and application method thereof

A technology of supercritical fluid and drying device, applied in drying gas arrangement, heating device, local stirring dryer, etc., can solve the problem of volume expansion being damaged by the microstructure of the drying material, and achieve excellent drying effect, miniaturization of the device, and operation. easy effect

Active Publication Date: 2014-12-10
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to solve the problem that the volume expansion and microscopic density fluctuations in the existing supercritical fluid drying process will cause certain damage to the microstructure of the dried material, and provide a supercritical fluid drying device and its use method

Method used

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  • Supercritical fluid drying device and application method thereof
  • Supercritical fluid drying device and application method thereof
  • Supercritical fluid drying device and application method thereof

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specific Embodiment approach 1

[0034] Specific embodiment one: a kind of supercritical fluid drying device of this embodiment, it comprises heating device and drying kettle 5; The nozzle 4, the cooling area 6, the heating jacket 7, the heat insulation layer 8 and the constant temperature oil area 9; the drying kettle 5 is composed of an upper chamber 5-6, a lower chamber 5-2, and a flange interface 5-8 , intake valve 5-10, outlet valve 5-11 and pressure gauge 5-12;

[0035] The lower chamber 5-2 is provided with a sample stage 5-1, and the outer surface of the chamber housing of the upper chamber 5-6 is provided with a mechanical seal covering layer 5-3, an annular heat insulating layer 5-4, and a communication Tube 5-5, hollow plunger lower part 5-7 and hollow plunger upper part 5-9, wherein, the upper chamber 5-6 is connected to the lower chamber through the hollow plunger lower part 5-7 and the annular heat insulation layer 5-4 5-2 for separation, the annular heat insulation layer 5-4 is located at the ...

specific Embodiment approach 2

[0041] Specific embodiment two: the using method of a kind of supercritical fluid drying device of present embodiment is carried out according to the following steps:

[0042] 1. Put the material to be dried into the sample table 5-1, inject the drying medium into the upper chamber 5-6 and seal it, open the inlet valve 5-10, close the outlet valve 5-11, and pass through the inlet valve 5- 10 Continuously fill inert gas into the drying kettle 5 to make the pressure inside the drying kettle 5 reach 8-9 MPa, close the inlet valve 5-10, and then use the heating jacket 7 to heat the upper chamber at a heating rate of 3-5°C / min. The chamber 5-6 is continuously heated to keep the temperature of the upper chamber 5-6 greater than 1.4 times the critical temperature of the drying medium. 2 Carry out continuous heating to keep the temperature in the lower chamber 5-2 lower than the critical temperature of the drying medium. After the pressures in the upper chamber 5-6 and the lower chamb...

specific Embodiment approach 3

[0049] Embodiment 3: The difference between this embodiment and Embodiment 2 is that the drying medium in step 1 is liquid carbon dioxide or methanol. Other steps and parameters are the same as in the second embodiment.

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Abstract

The invention provides a supercritical fluid drying device and an application method thereof, relates to a drying device and an application method thereof, and aims to solve the problem that the fluctuation of volume expansion and microcosmic density fluctuation caused by the conventional supercritical fluid drying technology can bring a certain damage to the microcosmic structure of the object under drying. The supercritical fluid drying device comprises a heating device and a drying kettle, the heating device is composed of an oil discharging opening, an oil feeding opening, a water inlet, a water outlet, a cooling region, a heating sleeve, a thermal insulating layer and a constant temperature oil region, and the drying kettle is composed of an upper part cavity, a lower part cavity, a flange interface, an air inlet valve, an air outlet valve and a pressure gage. According to the device provided by the invention, the drying medium physical state change is controlled through the adjusting of the temperature and pressure of the upper cavity and the lower cavity of the drying kettle, so as to enable the drying medium to drive the object under drying to be dried in the drying kettle. The drying device and method provided by the invention prevent the object under drying from being contacted with the fluid medium, violent in microcosmic density fluctuation, in the critical region, and are suitable for the protection of microcosmic structure of the object under drying.

Description

technical field [0001] The invention relates to a drying device and a using method. Background technique [0002] Common drying methods inevitably lead to agglomeration and damage to the microstructure of materials when drying nanoparticles and gel systems. In the ordinary drying process, the existence of surface tension will lead to the agglomeration of particles, and the sudden change in volume during the gas-liquid phase transition will destroy the microstructure of the material due to the volume expansion of the dispersed phase. The essence of supercritical fluid drying is the continuous change of the physical properties (density) of the gel dispersed phase and nanoparticle medium environment during the drying process. When the substance is in the supercritical fluid state, there is no phase interface between the gas phase and the liquid phase, so there is no surface tension, so the agglomeration phenomenon caused by surface tension can be avoided. The phase change bet...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F26B9/06F26B21/14F26B23/00
Inventor 孟令辉于佳立范大鹏吴丽娜周红霞
Owner HARBIN INST OF TECH
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