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Method for measuring relative content of hexafluoropropylene oxide and hexafluoroacetone

A technology of hexafluoropropylene oxide and hexafluoroacetone, which is applied in the field of determination of the relative content of hexafluoropropylene oxide and hexafluoroacetone, can solve problems such as difficult separation, and achieve rapid detection, high precision and accuracy, and low experimental cost low effect

Pending Publication Date: 2020-04-21
TIANJIN CHANGLU CHEM NEW MATERIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, because hexafluoropropylene oxide and hexafluoroacetone are isomers with similar boiling points, separation is difficult (hexafluoropropylene oxide -27.0°C, hexafluoroacetone -27.4°C)

Method used

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  • Method for measuring relative content of hexafluoropropylene oxide and hexafluoroacetone
  • Method for measuring relative content of hexafluoropropylene oxide and hexafluoroacetone
  • Method for measuring relative content of hexafluoropropylene oxide and hexafluoroacetone

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Embodiment 1

[0020] Example 1: Determination of the content of hexafluoropropylene oxide and hexafluoroacetone in the mixed gas after the isomerization reaction of hexafluoropropylene oxide

[0021] 1. Determination of the purity of the standard product: the purity of the standard product of hexafluoroacetone and hexafluoropropylene oxide was determined by gas chromatography, both of which were greater than 99%; Figure 1-2 Respectively show the standard sample figure of hexafluoropropylene oxide and hexafluoroacetone;

[0022] 2. Establish a standard curve: transfer different amounts (or pressures) of hexafluoroacetone (or hexafluoropropylene oxide) standard substances to the infrared gas sample cell through a metal vacuum line to obtain hexafluoroacetone (or hexafluoropropylene oxide) Propane) standard infrared spectrum; based on 1550 cm -1 The absorbance value at place and the pressure of hexafluoropropylene oxide establish a standard curve, and its standard curve is as follows image ...

Embodiment 2

[0025] Embodiment two:: measure the content of the mixed gas of hexafluoroacetone and hexafluoropropylene oxide

[0026] Concrete steps are identical with embodiment 1. Determination result is as follows: the absorbance value of measured sample at 1807 cm-1 place (hexafluoroacetone) is 0.060, the absorbance value at 1550 cm-1 place (hexafluoropropylene oxide) is 1.962, utilizes image 3 and Figure 4 The pressure-absorbance standard curve of hexafluoropropylene oxide and hexafluoroacetone shown in , calculates that the content of hexafluoroacetone is 2.73 mm Hg, and the content of hexafluoropropylene oxide is 46.38 mm Hg. Further calculations draw this The relative ratio of hexafluoroacetone and hexafluoropropylene oxide in the mixed gas is 5.6:94.4.

Embodiment 3

[0027] Embodiment three: measure the content of the mixed gas of hexafluoroacetone and hexafluoropropylene oxide

[0028] Concrete steps are identical with embodiment 1. Determination result is as follows: the absorbance value of measured sample at 1807 cm-1 place (hexafluoroacetone) is 1.857, the absorbance value at 1550 cm-1 place (hexafluoropropylene oxide) is 0.106, utilizes image 3 and Figure 4 The pressure-absorbance standard curve of hexafluoropropylene oxide and hexafluoroacetone shown in , calculates that the content of hexafluoroacetone is 84.41 mm Hg, and the content of hexafluoropropylene oxide is 2.51 mm Hg, and further calculations draw this The relative ratio of hexafluoroacetone and hexafluoropropylene oxide in the mixed gas is 97.11:2.89.

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Abstract

The invention belongs to the field of compound content measurement, and particularly relates to a method for measuring the relative content of hexafluoropropylene oxide and hexafluoroacetone. The method comprises: (1) determining the purity of a standard substance; (2) establishing a standard curve; (3) analyzing and detecting a sample: accurately transferring mixed gas of hexafluoroacetone and hexafluoropropylene oxide through a metal vacuum line, measuring an infrared spectrogram of the mixed gas, and reading absorbance at the wave number selected in the step (2); and (4) result calculation:comparing the absorbance value measured in the step (3) with the standard curve established in the step (2) to obtain the content of hexafluoroacetone or hexafluoropropylene oxide in the sample, andfurther calculating the relative content of hexafluoroacetone and hexafluoropropylene oxide. The method has the advantages of convenience and quickness in operation and quickness in detection, and ishigh in precision and accuracy; the volume of the sample required by detection is small, and detection is safe and reliable; only an infrared spectrometer and other simple instruments are needed, andthe experiment cost is low.

Description

technical field [0001] The invention belongs to the field of compound content measurement, in particular to a method for determining the relative content of hexafluoropropylene oxide and hexafluoroacetone. Background technique [0002] Hexafluoroacetone (CF3COCF3, HFA for short) is a fluorine-containing fine chemical with a wide range of uses. It was reported in the literature for the first time in 1957. In the 1960s, it was successfully piloted by Allied Chemical Company and Du Pont Company of the United States. Due to the strong electron-withdrawing properties of the two -CF3 groups, the physical and chemical properties of HFA are very different from those of acetone, and it also has unique physical and chemical properties. Hexafluoroacetone can be used in the fields of medicine, pesticides and synthetic materials, especially as a raw material for the synthesis of polymer materials in special fields. Among them, hexafluoroacetone has been used as a raw material for advanc...

Claims

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Application Information

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IPC IPC(8): G01N21/3504G01N30/02
CPCG01N21/3504G01N30/02G01N2030/025
Inventor 陈爽王博徐雅硕张志君
Owner TIANJIN CHANGLU CHEM NEW MATERIAL CO LTD