Solution configuration method used for vapor pressure measurement and vapor pressure measurement method

A technology of configuration method and measurement method, applied in the directions of dissolution method, measurement device, separation method, etc., can solve the problems of loss of glassy state of solution, increase of concentration uncertainty, difficulty of solution concentration, etc., and achieve short experimental operation time. , Improve the preparation accuracy and save the effect of the degassing process

Inactive Publication Date: 2016-10-26
ZHEJIANG UNIV
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  • Abstract
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Problems solved by technology

[0009] The above-mentioned method of measuring vapor pressure is widely used in practice, but we also realize that there is a significant problem: although the process of freezing-vacuumizing-thawing can remove impurity gases, the low-temperature freezing degassing method exists Some disadvantages: For example, if liquid nitrogen is used, the risk of operation will increase; the procedure of freezing-thawing degassing cycle is cumbersome, time-consuming and labor-intensive; repeated freezing and thawing of glassy solutions will cause the solution to lose its glassy state ; Solvent and solute are volatilized during the vacuuming process, and this volatilization is difficult to quantitatively distinguish its components, and the concentration uncertainty of the standard solution is increased. It is difficult to know the concentration of the solution after degassing or requires expensive chromatographs. equipment

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  • Solution configuration method used for vapor pressure measurement and vapor pressure measurement method
  • Solution configuration method used for vapor pressure measurement and vapor pressure measurement method

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Embodiment Construction

[0044] Such as figure 1 As shown, the vapor pressure measurement method of this embodiment includes the preparation of the solution to be tested and the determination of vapor pressure, and the following tools need to be prepared:

[0045] Solvent container 1, transparent and marked with a volume scale, the upper end is open, the lower end is closed and leads to a diversion tube, which is provided with a valve 3;

[0046] The solute container 5 is fully sealed, the upper end cover is opened to lead out the diversion pipe, and the diversion pipe is provided with a valve 31;

[0047] The three-way pipe 4, the first port and the second port are in line, so that the third port is not bypassed when the solvent is injected into the solute container. The third port is set at an angle of 45 degrees upwards relative to the horizontal plane. The third port has There is a valve 32; the third port is used to connect to the vacuum pump to suck out the air in the tee 4, and a valve 32 is set betwe...

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Abstract

The present invention discloses a solution configuration method used for vapor pressure measurement. The method comprises the following steps of (1) vacuumizing, sealing and weighing a solute container, and recording the mass as m1; (2) adding n predetermined solutes in the solute container, and recording the total mass as m2; (3) injecting a predetermined amount of solvent in a solvent container, and then injecting a protection liquid; (4) heating the solvent in the solvent container to reduce the air solubility; (5) connecting the solute container and the solvent container via a connecting pipe; (6) vacuumizing the interior of the connecting pipe; (7) injecting the solvent processed in the step (4) from the bottom of the solvent container in the solute container in the step (2) via the connecting pipe; (8) weighing the solute container processed in the step (7), recording the total mass as m3, and calculating an accurate concentration, thereby finishing the configuration of the solution. The present invention also discloses a vapor pressure measurement method. According to the methods of the present invention, the interference of the foreign gases when the vapor pressure is measured is small, and a measurement result is more accurate.

Description

Technical field [0001] The present invention relates to a method for measuring the vapor pressure of a solution, in particular to a solution configuration method and a vapor pressure measurement method for vapor pressure measurement. Background technique [0002] Salt solution desiccant is an important dehumidifying substance, and it has important applications in air humidity control technology. [0003] In industrial production and daily life, air humidity has an important impact: in printing and dyeing, textile, pharmaceutical and other industries, air humidity affects the production quality of industrial products; in daily life, air humidity affects human comfort Key factor. Effective humidity control is an important issue in artificial environments. Current conventional air conditioners mostly use surface cooling and condensation methods to control humidity. The disadvantages of this method are high energy consumption, low energy utilization, and it is not easy to control te...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01L11/00B01F1/00B01D19/00
CPCB01D19/00G01L11/00B01F21/02B01F21/30
Inventor 何一坚徐佳晨陈光明唐黎明
Owner ZHEJIANG UNIV
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