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

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...

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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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