High pressure visable adjustable volume phase balance determining device

A measuring device and phase balance technology, applied in the field of chemical engineering, can solve the problems such as the inability to change the volume of the autoclave balance tank online, the influence of pressure, and the complexity of the test process, so as to facilitate the adjustment and control of test conditions, increase the pressure change value, and expand the test. range effect

Inactive Publication Date: 2007-08-22
SHANGHAI JIAO TONG UNIV
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Problems solved by technology

However, the instruments and equipment used in the existing test methods are either complex in structure and high in price, or the test process is complicated, the detection time is long, or the volume of the autoclave cannot be changed online, thus limiting the phase balance and solute solubility in the supercritical fluid system Research on measurement, etc.
[0003] Chinese patent ZL2003201229405 discloses a measuring device for solubility in near-critical water. A set of solubility measuring device is designed by static method. The measuring temperature reaches 350°C and the pressure reaches 30MPa. It has an impact on the pressure, which will affect the balance of the system and cause large errors in the data
The Journal of Nanjing University of Chemical Technology, Volume 17, No. 4, 1995, reported a two-phase alternating cycle high-pressure phase equilibrium experimental measurement device. The equipment cost is relatively high, and it can only measure liquid samples, and cannot measure the solubility of solid samples.
Chinese patent ZL01119214.3 discloses a dissolving device and a dyeing device for dissolving solid particles in a supercritical fluid or a quasi-critical fluid. It does not specify the temperature and pressure that can be used, and it is not suitable for liquid samples.

Method used

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  • High pressure visable adjustable volume phase balance determining device

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Experimental program
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Effect test

Embodiment 1

[0021] CO 2 The mensuration of critical point, as shown in Fig. 1 Fig. 2 device structural diagram, the visual window of described cylinder body 9 is a wide 10mm, the strip window of long 85mm, field of view reaches 85 * 10mm 2 . A certain amount of CO 2 Drive into the visible cylinder 9 through the liquid inlet joint 16 to make the pressure reach 9MPa, and control the temperature at 32°C through the temperature sensor 20. After the temperature is stable, move the plunger 3 by adjusting the screw 1 to change the visible cylinder 9. The volume reduces the pressure from 9MPa to about 7.3MPa. During the pressure change, observe the CO in the cylinder from the visual window 2 The fluid changes from clear and transparent to turbid and dark. When the pressure in the cylinder increases gradually to 9MPa by adjusting the screw 1 and moving the plunger 3, the fluid in the cylinder changes from turbid and dark to clear and transparent again. This phenomenon can be observed repeatedl...

Embodiment 2

[0023] Supercritical CO 2 Solubility determination of acetylated cyclohexine in fluid. As shown in Fig. 1 and Fig. 2 device structure diagram, open the pressure cap 4, weigh 0.3 g of acetylated Huanhu Jing into the visible cylinder 9, tighten the pressure cap, and set the temperature of the visible cylinder 9 to 45°C, a certain amount of CO 2 Drive into the cylinder 9 through the liquid inlet joint 16 to make the pressure reach 30MPa, turn on the magnetic stirring controller 15, and then slowly rotate the adjusting screw 1 to move the plunger 3 to gradually increase the pressure of the cylinder to 36MPa. , stirred for 2 hours, through the viewing window, it can be seen that the acetylated cyclohexine is completely dissolved in supercritical CO 2 In the fluid; when adjusting the reverse rotation of the screw 1 to gradually reduce the pressure of the cylinder to 36MPa, it can be observed that there is precipitation of acetylated Huanhu essence in the cylinder, and when the pre...

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Abstract

This invention relates to a kind of high pressure, visual and volume adjustable phase equilibrium measure device. It is tube structure with visual window. There is semi-open type insulating sleeve in the periphery, temperature sensor in the inner wall. The press hat in the top of the tube links with the adjusting bracket, the adjusting lead screw in the central axis of the adjusting bracket links with the plunger piston in the tube, which drives the plunger piston reciprocate in the tube. The ends of the tube bottom link with the CO2 liquid and feeding system by the discharge joint and the input joint. The magnetic stirring controller is set in the bottom of the device. The invention can change the volume of the visual tube by adjusting the lead screw active plunger piston, it has increased the change value of the pressure in the tube, enlarged the testing range of the system.

Description

technical field [0001] The invention relates to a phase balance measuring device with a high-pressure visually adjustable volume, in particular to a phase balance measuring device with a high-temperature, high-pressure adjustable volume and a visible window, which is used for phase balance such as cloud point and solute solubility in a supercritical fluid system. The invention relates to the determination of balance, which belongs to the field of chemical engineering. Background technique [0002] supercritical fluid CO 2 Due to its unique physical and chemical properties, it has become an important green solvent to replace organic solvents. It has important practical applications in the fields of chemistry, chemical industry, food, pharmaceuticals, materials, etc. At present, great progress has been made in scientific experimental research and industrial application. The research on the phase equilibrium of supercritical fluid system and the solubility of solute in supercr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N33/00G01N13/00
Inventor 赵亚平唐生荣孙国良顾吉圣
Owner SHANGHAI JIAO TONG UNIV
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