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A method and process for controlling the temperature, pressure-and density profiles in dense fluid processes

A fluid and pressure technology, which is applied in the control of temperature, pressure and density profiles and process fields in dense fluid processing, can solve the problems of small heat exchange area, low process efficiency, large fluctuation of product quality, etc., and achieve high capacity output Effect

Inactive Publication Date: 2007-01-10
SCF TECH AS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] However, when the process was scaled up to larger scale industrial vessels, it was found that the heat exchange area of ​​the vessel was not large enough to ensure sufficient heat exchange across the vessel walls
And it was further found that there are significant temperature and density gradients in the vessel which lead to a lower efficiency of the process and can lead to unacceptably large fluctuations in the quality of the final product

Method used

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  • A method and process for controlling the temperature, pressure-and density profiles in dense fluid processes
  • A method and process for controlling the temperature, pressure-and density profiles in dense fluid processes
  • A method and process for controlling the temperature, pressure-and density profiles in dense fluid processes

Examples

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Embodiment 1

[0257] Example 1: Cyclic process for supercritical impregnation

[0258] The traditional supercritical impregnation process consists of 3 consecutive steps: The material to be treated is introduced into a pressure vessel.

[0259] In a first step, a fluid is added to the reactor to pressurize the vessel until the pressure in the vessel exceeds the desired pressure of the fluid. The temperature of the fluid can be controlled by conventional means prior to introduction into the vessel, and the temperature in the reactor is further controlled to a level exceeding the desired temperature of the fluid by controlling the wall temperature. Upon reaching the temperature and pressure, the fluid sequestered in the vessel enters a supercritical state and the impregnating compound becomes soluble in the fluid. Compression of the fluid in the container further occurs as the container is pressurized as the fluid is introduced, and as the fluid is defined to be compressible. The heat from ...

Embodiment 2

[0262] Example 2. Cyclic pulsation process for supercritical impregnation

[0263] During the holding phase of the supercritical impregnation phase, as described in Example 1, the pressure and temperature were maintained substantially constant. The dispersion of the impregnating compound in the impregnated porous material is therefore mainly due to diffusion, since there is no convective supercritical solvent flow inside the porous material. To enhance and speed up the dispersion of the impregnating compound, pressure pulsations can be introduced during the impregnation stage, creating convection within the material. In order to preserve the dissolved impregnating compound in the vessel, pressure pulsations are preferably introduced by pulsations of the supercritical solvent inlet temperature, that is, by changing the set point of the heat exchanger in recirculation mode in the recirculation loop. By pulsating the pressure, a pumping effect is created in the porous material, ...

Embodiment 3

[0269] Example 3 Cyclic Supercritical Process with Recycle

[0270] One aspect of the present invention relates to a cyclic process for supercritical extraction processing of materials.

[0271] Thus, in a preferred embodiment of the present invention, the material treated using the supercritical extraction process is initially loaded into a pressure vessel.

[0272] In many applications, the recycle process begins by cleaning the vessel with the specific fluid used in the recycle process to minimize contamination of the fluid. This cleaning can be carried out by applying a vacuum (pressure below ambient pressure) into the vessel while feeding a specific fluid into the vessel for a certain period of time. Typically, the cleaning time is between 1 and 20 minutes. In other cases, the cleaning can be carried out by pressurizing the vessel up to 0.5-5 bar above ambient pressure, and emptying the vessel until the pressure is substantially the same as ambient pressure. Any combin...

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Abstract

The present invention relates to a method of treating a material contained in a vessel. This method involves a fluid present in the vessel and comprises at least one pressurisation step in which the pressure in the vessel is increased and at least one depressurisation step in which the pressure in the vessel is decreased. The invention further relates to an apparatus for executing this method and the products obtained by this method.

Description

technical field [0001] The present invention relates to a method and apparatus for controlling temperature, pressure and density profiles in vessels operating under high pressure conditions, especially dense fluids under supercritical conditions. More particularly, the present invention relates to detection and processing, and an apparatus for controlling temperature, pressure and density profiles in a pressure vessel to increase the efficiency of the method. Background technique [0002] Fluids at high pressure, especially in supercritical conditions, have good properties for many applications. Diffusivity, viscosity and surface tension are similar to gases, while eg density and solubility are similar to liquids. Furthermore, the solubility can be adjusted by simple means such as temperature and pressure. [0003] These favorable properties of such dense fluids under subcritical or supercritical conditions have attracted growing interest, and many applications are being d...

Claims

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Application Information

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IPC IPC(8): B01D11/02A61K9/14B01D11/00B01D15/08B01J3/00B01J19/00B01J20/286B01J20/32B27K3/00B27K3/08B27K3/34B27K3/38B27K3/50B27K7/00G01N30/02
CPCB01J19/0006B27K3/005B27K3/34B01J20/32B27K3/086B27K3/08G01N30/02B27K3/52B01J20/286B01J2219/00168B01J2219/00162B01D11/0411B01D11/0265B01J3/008B27K3/343B01J2220/54B27K7/00B01J2219/00171B01J20/3242Y10T137/0396B27K3/007B01D11/0203B27K5/008B27K2240/10B01J20/3204B01J20/3208B01J20/3212B01J20/3251B01J20/3253B01J20/3255B01J20/3257B01D11/028B01D11/0296B01D15/40B01D11/00B01D11/02B01D15/08B01J3/00
Inventor 斯蒂恩·布鲁默斯特德·艾弗森卡尔斯登·弗尔斯王托米·拉森维歌·卢杰奥利·亨里克森
Owner SCF TECH AS
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