Method for rapidly measuring solid chemical vapor pressure

Abstract

The invention relates to a method for rapidly measuring the solid chemical vapor pressure. The method includes the steps that the temperature of a water medium in a trough of a device for rapidly measuring the solid chemical vapor pressure is adjusted, a second valve is opened, nitrogen is led in through a vacuum pump in a vacuumized mode, and the current initial vapor pressure value P<0> is recorded; the heating temperature is adjusted, nitrogen is led in, and the vapor pressure value P<1> at the moment is recorded; the vapor pressure of a solid chemical layer is obtained with the formula that the difference between P<1> and P<0> is equal to P<vapor pressure>. According to the method, it is achieved that the device runs in vacuum by connecting the vacuum pump, and the measured result is not disturbed by the outside world; solid chemicals are stored through high-borosilicate glass envelopes, and the volume of a high-borosilicate heat resisting container is permitted to provide accurate measurement in measurement time through minimum bending exposure of the borosilicate glass envelopes.

Description

technical field [0001] The invention belongs to the technical field of chemistry, in particular to a method for quickly measuring the vapor pressure of solid chemicals. Background technique [0002] There are many measurement methods for the vapor pressure of substances, such as the boiling point meter method, isobarometer method, flow-through method, Nusen gap penetration method, etc., which can be generally summarized into two categories: dynamic method and static method. Generally speaking, the static method is mostly used to measure the middle and high pressure vapor pressure. , but preferably not less than 0.5kPa, the lower limit of the pressure measurement of the flow escape method is 0.05Pa (Fu Zhonghua et al., 2010). In recent years, there have been many researches on the determination methods of extremely low vapor pressure, among which the mass gap penetration method has always been the most accurate and effective method for determining the extremely low vapor pre...

AI Technical Summary

Problems solved by technology

[0011] The present invention solves the problems in the known technology that the device is complex and difficult to install, time-consuming and laborious, inconvenient to operate, and there are errors in the later measurement results, and provides a rapid determination of solid chemistry with simple structure, convenient installation and use, and improved work efficiency. product vapor pressure method

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