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Microwave field vapor-liquid equilibrium measuring device and determination method

A technology of vapor-liquid balance and microwave field, which is applied in the direction of measuring devices, test sample preparation, instruments, etc., to achieve efficient heating, easy cleaning and drying effects

Inactive Publication Date: 2012-06-27
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These conventional methods are all vapor-liquid equilibrium measurements without an external physical field, but experiments have shown that the microwave field can change the boiling point and volatility of a considerable part of polar or weakly polar substances.

Method used

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  • Microwave field vapor-liquid equilibrium measuring device and determination method
  • Microwave field vapor-liquid equilibrium measuring device and determination method
  • Microwave field vapor-liquid equilibrium measuring device and determination method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] Under 101.3kPa, propanol (1) / propyl propionate (2) was selected for conventional vapor-liquid equilibrium and vapor-liquid equilibrium experiments under microwave field. Prepare 50mL of liquid mixtures in different proportions in the vapor-liquid balance tank, check the safety and stability of the device, turn on the condensate, control the pressure at 101.3kPa, adjust the microwave power to 100W, start heating, and wait until the reflux is stable and the temperature remains unchanged After about 30 minutes, turn off the microwave generator, take samples immediately, and carry out chromatographic analysis.

[0042] Its vapor-liquid equilibrium composition is shown in the following table, x1 and y1 respectively represent the molar composition of the liquid phase and vapor phase propanol in equilibrium.

[0043]

Embodiment 2

[0045] Under 101.3kPa, select ethanol (1) / benzene (2) for conventional vapor-liquid equilibrium and microwave field vapor-liquid equilibrium experiments, prepare 50mL of liquid mixtures with different proportions in the vapor-liquid equilibrium kettle, and check the safety and stability of the device , turn on the condensate, control the pressure at 101.3kPa, adjust the microwave power to 50W, start heating, wait until the reflux is stable, and the temperature remains unchanged for about 30 minutes, turn off the microwave generator, take a sample immediately, and carry out chromatographic analysis.

[0046] Its vapor-liquid equilibrium composition is shown in the following table, x1 and y1 represent the molar composition of the liquid phase and vapor phase ethanol in equilibrium respectively.

[0047]

Embodiment 3

[0049] Under 101.3kPa, select ethanol (1) / benzene (2) for conventional vapor-liquid equilibrium and microwave field vapor-liquid equilibrium experiments, prepare 50mL of liquid mixtures with different proportions in the vapor-liquid equilibrium kettle, and check the safety and stability of the device , turn on the condensate water, control the pressure at 101.3kPa, adjust the microwave power to 200W, start heating, wait until the reflux is stable, and the temperature remains unchanged for about 30 minutes, turn off the microwave generator, take samples immediately, and carry out chromatographic analysis.

[0050] Its vapor-liquid equilibrium composition is shown in the following table, x1 and y1 represent the molar composition of the liquid phase and vapor phase ethanol in equilibrium respectively.

[0051]

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Abstract

The invention relates to a microwave field vapor-liquid equilibrium measuring device and a determination method. A vapor-liquid equilibrium kettle (3) is arranged in a microwave cavity main body (1); temperature measurement points of a vapor-liquid interface infrared thermodetector (6) are arranged on an upper surface of a mixture liquid; temperature measurement points of a liquid phase main body infrared thermodetector (10) are arranged on a middle part of a liquid phase main body upper segment (9); a microwave generator (14) is connected with a rectangular waveguide (15) through a microwave circulator water load (16); the rectangular waveguide (15) is connected with an interface of the microwave cavity main body (1); the microwave generator (14) effects microwave energy on an interface of the liquid phase main body upper segment (9) of the vapor-liquid equilibrium kettle and a vapor main body (13); and the liquid is heated, vaporized and condensed by a condenser (4) and returns to a liquid phase main body lower segment (8) through a back flow (7); after equilibrium, samples are taken respectively from a liquid phase sample tap (11) and a vapor sample tap (5) and analyzed. Microwave does not heat the vapor-liquid equilibrium kettle body made of a borosilicate glass material but directly effects on vapor phase main body and the liquid phase main body, so as to realize characteristics of energy saving, rapidness and efficient heating.

Description

technical field [0001] The invention belongs to the field of chemical mass transfer and separation process strengthening, and in particular relates to a microwave field vapor-liquid phase equilibrium measuring device and a measuring method. Background technique [0002] In chemical production, we often face the separation of a large number of gas and liquid mixtures. The thermodynamic properties of these systems to be separated determine the possibility and degree of separation of the separation process. Vapor-liquid phase equilibrium data is an important part of the basic data of chemical industry, which is of great significance to the theoretical research and practical application of chemical engineering. For example, chemical process optimization, unit operation design, and vapor-liquid theoretical research are all closely related to vapor-liquid equilibrium and depend on the determination of vapor-liquid equilibrium data. [0003] Based on the importance of vapor-liquid...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N1/44G01N30/06
Inventor 丁辉侯钧
Owner TIANJIN UNIV
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