Measuring method of trace oxy-compound in liquid-phase propylene

A method of determination, liquid-phase propylene technology, applied in the direction of measuring devices, instruments, scientific instruments, etc., can solve the problems such as the inability to measure or inaccurately measure the content of trace oxygen-containing compounds, and achieve the effect of stable gas absorption process and sufficient absorption

Active Publication Date: 2013-01-02
CHNA ENERGY INVESTMENT CORP LTD +2
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Problems solved by technology

[0004] The present invention aims to provide a method for measuring trace oxygen-containing compounds in liquid-phase propylene, so as to solve the technical problem that the content of trace oxygen-containing compounds in liquid-phase propylene cannot be measured or measured inaccurately in the prior art

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  • Measuring method of trace oxy-compound in liquid-phase propylene

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Embodiment 1

[0027] 1. Experimental principle

[0028] This method adopts the liquid absorption method to collect, and the method of gas chromatography to determine the content of oxygen-containing compounds in propylene. Heat propylene at 120°C with a metal bath electric heating sampler, and then absorb oxygen-containing compounds in the sample with 100ml of deionized water. Under certain conditions, the absorbed sample is separated by gas chromatography. Various oxygen-containing compounds are combined with the stationary phase of the chromatographic column under the flow of the carrier gas. Due to the different degrees of separation of substances with different fixed phases, various oxygen-containing compounds are separated in the chromatographic column, and then pass through the flame ionization detector. (FID) was used to detect the content of each component, and the external standard method was used for quantification.

[0029] 2. Test equipment and reagents

[0030] Metal bath ele...

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Abstract

The invention discloses a measuring method of trace oxy-compound in liquid-phase propylene. The measuring method comprises the following steps of heating the liquid-phase propylene to be measured, and controlling the temperature at 90 DEG C to 120 DEG C; feeding the heated propylene into an oxy-compound absorption device through a flow-rate control device to obtain an absorption sample; and detecting the content of the oxy-compound in the absorption sample through the headspace gas chromatography. By utilizing the technical scheme, a constant-temperature bath device is used for heating the liquid-phase propylene, so that the low-temperature difficulty of the sample in daily measurement can be solved; the flow-rate control device is used for making the gas absorption process more stable and the absorption more adequate, so that the trace oxy-compound contained in the liquid-phase propylene is effectively concentrated; and integrating the technical features, the content of the trace oxy-compound in the liquid-phase propylene can be accurately measured by utilizing the headspace gas chromatography in the working field with low level of experimental instruments.

Description

technical field [0001] The invention relates to a method for measuring oxygen-containing compounds, in particular to a method for measuring trace amounts of oxygen-containing compounds in liquid-phase propylene. Background technique [0002] The content of oxides in liquid-phase propylene is extremely small, and conventional methods for measuring the content of oxides, such as gas chromatography, cannot measure the content. Because the detection limit of the conventional method for determining the content of oxides is far greater than the content of oxides in liquid-phase propylene. [0003] Due to the limitations of sample volume and detection limit, the existing analysis methods for liquid phase propylene cannot detect trace oxygenated compounds, and can only detect conventional hydrocarbon gases and ppm-level CO, CO 2 Gas is measured. Moreover, liquid-phase propylene has the phenomenon of endothermic gasification resulting in low temperature, and is easy to freeze the a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N30/02G01N30/06
Inventor 张维斌赵灵春贺秀成蒿非
Owner CHNA ENERGY INVESTMENT CORP LTD
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