Method for detecting purity of perfluoroisobutyronitrile in perfluoroisobutyronitrile mixed gas

Abstract

The invention provides a method for detecting purity of perfluoroisobutyronitrile in a perfluoroisobutyronitrile mixed gas, and the method is as follows: detecting the to-be-tested perfluoroisobutyronitrile mixed gas by using a gas chromatography-mass spectrometer to obtain impurity gas components and estimated volume fractions; configuring standard gases according to the estimated volume fractions; detecting the standard gases by a gas chromatograph or the gas chromatography-mass spectrometer, and using an external standard method to obtain standard curves and fitting Equations of impurity gases; detecting the to-be-tested perfluoroisobutyronitrile mixed gas again, and using the fitting equations to obtain volume fractions of all the impurity gases in the to-be-tested perfluoroisobutyronitrile mixed gas; and based on the volume fractions of the impurity gases, obtaining the purity of the perfluoroisobutyronitrile in the mixed gas to be tested. The new method for detecting the purity of the perfluoroisobutyronitrile in the perfluoroisobutyronitrile mixed gas is accurate and reliable, simple in operation and convenient in calculation.

Description

technical field [0001] The invention relates to the field of product detection and analysis, in particular to a method for detecting the purity of perfluoroisobutyronitrile in a mixed gas of perfluoroisobutyronitrile. Background technique [0002] Sulfur hexafluoride (SF6) gas is widely used in high-voltage equipment as a good insulating and arc-extinguishing medium. However, the global warming factor (GWP) of sulfur hexafluoride is 23900 times that of CO2. Therefore, the power industry urgently needs Alternatives to sulfur hexafluoride. The mixed insulating gas composed of perfluoroisobutyronitrile (C4F7N) and CO2, as a new type of sulfur hexafluoride substitute gas for electrical equipment, has been used in 145kV gas insulated switchgear (GIS) and 420kV gas insulated transmission line (GIL), etc. Electrical Equipment. The GWP of perfluoroisobutyronitrile is only 10% of SF6, and the liquefaction temperature is -4.7°C. When mixed with buffer gases such as CO2 and N2, the c...

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Problems solved by technology

[0004] In view of this, the present invention proposes a detection method for the purity of perfluoroisobutyronitrile in a mixed gas of perfluoroisobutyronitrile, aiming to solve the problems of the detection of purity of perfluoroisobutyronitrile and impurity components in a mixed gas of perfluoroisobutyronitrile

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