Method and device for detecting micro oxygen containing compound in low boiling point hydrocarbon
A determination method and low boiling point technology, applied in measurement devices, instruments, scientific instruments, etc., can solve the problems of sample distortion, more hydrocarbons, less other components, etc., and achieve the effect of overcoming errors
Inactive Publication Date: 2009-10-21
SINOPEC LANZHOU GASOLINEEUM CHEM IND CORP
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Problems solved by technology
However, in industrial production or experimental research, low-boiling hydrocarbons are in a liquid state in process pipes or equipment containers. When the hydrocarbons contain other components (impurities) with higher boiling points than the hydrocarbons themselves, the above sampling and injection methods should be used. , due to the relative volatilities of hydrocarbons and other components are different, the composition of hydrocarbons entering the chromatogram is more, while other components are less, which is easy to cause sample distortion
This unreasonable sampling method makes the analysis result unable to accurately reflect the composition of the sample to be analyzed
Method used
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[0025] (1) Measuring equipment
[0026] It includes a sampling cylinder 1, an inert gas cylinder 4 and a gas chromatograph 3, wherein the inlet valve of the sampling cylinder 1 is connected to the inert gas cylinder 4, and a pressure is set between the outlet valve of the inert gas cylinder 4 and the inlet valve of the sampling cylinder 1. Table 5: The outlet valve of the sampling cylinder 1 is connected to the gas chromatograph 3 through the filter 6, and a liquid valve 2 is provided at the liquid inlet of the gas chromatograph 3 to ensure that the sample enters the gas chromatograph 3 in liquid phase.
[0027] (2) Measurement method
[0028] ①Liquid phase sampling: using mixed C4 as the base material, prepare a standard sample containing 10 mg / Kg of sec-butanol, tert-butanol and methyl ethyl ketone. Open the outlet valve of the inert gas cylinder, fill the sampling cylinder with inert gas, and adjust the pressure in the sampling cylinder so that the low-boiling hydrocarbon ...
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The invention relates to a method for gas chromatography analysis and determination of trace oxygen-containing compounds in low-boiling hydrocarbons. The method adopts liquid-phase sampling and liquid-phase sampling, which overcomes the errors caused by sampling and sampling methods in the existing analysis and determination methods , so that the sample entering the chromatograph maintains the original composition, so that the chromatographic detection results can truly and accurately reflect the composition of the analyzed material. The present invention also provides a measuring device for trace oxygen-containing compounds in low-boiling point hydrocarbons. The device includes a sampling steel cylinder and a gas chromatograph connected to the sampling steel cylinder through a liquid valve. The sampling port of the sampling steel cylinder is connected with a The inert gas cylinder is used to fill the sampling cylinder with inert gas, so that the low-boiling hydrocarbons in the cylinder can maintain a certain pressure, so as to ensure that the liquid phase sample is taken out.
Description
technical field [0001] The invention relates to a method for measuring trace substances, in particular to a method for measuring trace oxygen-containing compounds in low-boiling point hydrocarbons. Background technique [0002] Low-boiling hydrocarbons refer to hydrocarbons that are gaseous at normal temperature and pressure, mainly based on C 3 、C 4 Main components, while containing trace amounts of oxygen-containing compounds. The analysis and determination method of trace oxygenated compounds in the existing low-boiling point hydrocarbons usually adopts the analysis method of gas chromatography: the sample is extracted from the working process container with a bladder or a steel cylinder, and then the sample is extracted from the bladder (or steel cylinder) using a syringe. A certain volume of sample is taken and transported into the chromatograph for detection. However, in industrial production or experimental research, low-boiling hydrocarbons are in a liquid state i...
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IPC IPC(8): G01N30/02G01N30/86G01N30/06G01N1/22
Inventor 苏芳云王文华王桂敏陈小平刘双明姚亚平李彬
Owner SINOPEC LANZHOU GASOLINEEUM CHEM IND CORP