Method for accurately controlling temperature and pressure of supercritical extraction process

A supercritical and pressure technology, applied in the direction of non-electric variable control, control/regulation system, simultaneous control of multiple variables, etc., can solve the problems of supercritical fluid density reduction, extraction volume increase, disturbance, etc.

Inactive Publication Date: 2015-09-30
CHANGCHUN UNIV OF TECH
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Problems solved by technology

[0003]In the production process of carbon dioxide supercritical extraction, temperature and pressure are the most important control parameters. The influence of temperature on the dissolving capacity of supercritical fluid is complicated. The volatility of the extracted substance increases with temperature, which increases the concentration of the extracted substance in the supercritical gas phase, thereby increasing the extraction amount; but on the other hand, as the temperature rises, the density of the supercritical fluid decreases, so that the chemical composition Solubility decreased
When the control system i

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  • Method for accurately controlling temperature and pressure of supercritical extraction process
  • Method for accurately controlling temperature and pressure of supercritical extraction process
  • Method for accurately controlling temperature and pressure of supercritical extraction process

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Embodiment Construction

[0033] The method of the present invention is:

[0034] (1) To control the temperature and pressure of the extraction axe, it must first be extracted accurately. According to the process requirements, the sensor for measuring the temperature in the extraction kettle is installed in the jacket of the hot water circulating in the extraction axe; the sensor for measuring the pressure in the extraction kettle is installed in the pipeline where the supercritical carbon dioxide fluid enters the inlet of the extraction kettle.

[0035] (2) The heat required for the temperature rise and fall in the extraction ax is provided by the circulating hot water in the jacket of the extraction kettle, and the circulating hot water is heated by the electric heating tube in the hot water tank, and then supplied to the extraction kettle by a thermal circulation pump The hot water in the jacket is circulated, and the heating tube is controlled on and off by a solid state relay. According to the rea...

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Abstract

The invention discloses a method for accurately controlling the temperature and pressure of a supercritical extraction process. By aiming at the characteristics of non-linearity, strong coupling and interference nonmeasurability of temperature and pressure as well as high requirement on temperature and pressure control accuracy in a carbon dioxide supercritical extraction process, the method is characterized on the basis of deeply analyzing an extraction process mechanism, a partial mathematic model of the extraction process is established; based on the model, a multivariable inference control method is adopted to control the temperature and pressure in an extraction kettle in the extraction process. The method is capable of not only realizing decoupling between the temperature and pressure of the extraction process, but also realizing full tracking under set value disturbance and full compensation under nonmeasurable disturbance, improving the temperature and pressure control accuracy and substance extraction ratio of the extraction process and improving economic benefits.

Description

technical field [0001] The invention relates to a carbon dioxide supercritical extraction production process, in particular to a precise control method for the temperature and pressure of the supercritical extraction process. Background technique [0002] As a fluid medium with a wide range of green and environmental sources, supercritical carbon dioxide is widely used in the research and application of supercritical fluid extraction technology. The critical pressure of pure carbon dioxide is 7.38Mpa, and the critical temperature is 31.06°C. Carbon dioxide in a state above the critical pressure and critical temperature is called supercritical carbon dioxide. Supercritical carbon dioxide extraction depends on the dissolving ability of supercritical carbon dioxide fluid to solute, the solubility of solute in carbon dioxide fluid is related to the density of supercritical carbon dioxide, and the density of supercritical carbon dioxide depends on its temperature and pressure. ...

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Application Information

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IPC IPC(8): G05D27/02
Inventor 马海涛徐生欣尤元李丙林
Owner CHANGCHUN UNIV OF TECH
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