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Method for detecting mercury content in vinyl chloride monomer

A technology of vinyl chloride monomer and content, which is applied in the direction of measuring device, test sample preparation, color/spectral characteristic measurement, etc. It can solve the problem of difficult to accurately measure the sampling amount of vinyl chloride monomer, difficult to observe the appearance of the sample, the sampling amount of the sample, Threatening the safety and health of personnel and other issues, to achieve the effect of preventing insufficient sampling volume, facilitating accuracy, and easy cleaning

Active Publication Date: 2021-01-15
YIBIN HAIFENG HERUI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The former because the sampling container is directly connected to the outside atmosphere, a large amount of volatilization of low-boiling vinyl chloride monomer will endanger the safety and health of personnel, and it is difficult to accurately measure the sampling amount of vinyl chloride monomer; the latter is difficult to observe the appearance of the sample during the sampling process because the steel cylinder is opaque and control the sampling volume of samples, or it is not easy to clean, and there may be metal leaching substances such as iron, which will affect the quality of vinyl chloride monomer and make the test results inaccurate

Method used

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  • Method for detecting mercury content in vinyl chloride monomer
  • Method for detecting mercury content in vinyl chloride monomer
  • Method for detecting mercury content in vinyl chloride monomer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0068] Utilize above-mentioned vinyl chloride monomer sampling device to detect the mercury content in the vinyl chloride monomer of acetylene method, specifically comprise the following steps:

[0069] S1. In the pressure-resistant thick-walled quartz glass sample bottle of the vinyl chloride monomer sampling device with a capacity of 600ml, put a cleaned magnetic stirrer and 50ml of oxidizing acidic mixed solution, and the oxidizing acidic In the mixed solution, the mass concentration of sodium chloride is 0.5%, the mass concentration of sulfuric acid is 5%, and the mass concentration of potassium dichromate is 0.05%. Tighten the bottle cap of the sample bottle, and weigh the total mass of the vinyl chloride monomer sampling device currently described as W 0 .

[0070] S2. Use the vinyl chloride monomer sampling device to collect about 350 ml of liquid vinyl chloride monomer samples. After sampling, close the sample valve and then disconnect the connection. Weigh the total ...

Embodiment 2

[0096] This embodiment is a control experiment of embodiment one. According to the same steps and detection conditions as in embodiment one, the A#, B#, C# vinyl chloride monomer samples of Yibin Haifeng Herui Co., Ltd. are repeatedly sampled and tested, which is consistent with the implementation Example 1 differs only in:

[0097] (1) In step S1, instead of adding an oxidizing acidic mixed solution, 50 ml of ultrapure water was added.

[0098] (2) The blank control group in step S4 is 100 ml of ultrapure water.

[0099] The detection result of this embodiment is compared with embodiment 1, and the results are shown in Table 3.

[0100] Table 3 embodiment one and embodiment two detection result contrast

[0101]

[0102] As can be seen from Table 3, for the detection of 3 batches of samples, the average value of the detection results of embodiment two is significantly less than the average value of the detection results of embodiment one, indicating that there may be mer...

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Abstract

The invention discloses a vinyl chloride monomer sampling device. The vinyl chloride monomer sampling device comprises a sample bottle, a protective cover and a sampling valve, and the invention further discloses a method for detecting the mercury content in the vinyl chloride monomer. A used detection sample preparation device comprises the vinyl chloride monomer sampling device. The method and the device have the advantages that 1) the safety of chloroethylene monomer sampling operation is improved; 2) the representativeness and authenticity of the sample can be guaranteed, and the accuracyof a detection result can be improved; 3) the device is simple and convenient to operate, and realizes convenient sampling of vinyl chloride monomers. 4) a method for directly extracting mercury in the sampling container by magnetic stirring, gasifying the vinyl chloride monomer and discharging, and detecting the mercury content in the residual solution by adopting a cold atomic absorption methodand a standard curve method is provided for the first time. and 5) the detection result can truly reflect the mercury content in the vinyl chloride monomer.

Description

technical field [0001] The invention relates to a vinyl chloride production process, in particular to a vinyl chloride monomer sampling and detection method. Background technique [0002] Polyvinyl chloride resin is one of the five general-purpose plastics and is widely used in construction, industry, agriculture, daily necessities, automotive decoration, and home appliances. According to the method of obtaining vinyl chloride monomer, polyvinyl chloride resin can be divided into acetylene method polyvinyl chloride resin and ethylene method polyvinyl chloride resin. my country has the largest production capacity of polyvinyl chloride resin in the world. The production of vinyl chloride monomer is mainly based on the acetylene method, and its production capacity accounts for about 70% of the total production capacity. Vinyl chloride monomer is a colorless, liquefied gas with a boiling point of -13.8°C and forms an explosive mixture with air, with a volume explosion limit of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/31G01N1/22G01N1/28G01N1/40
CPCG01N21/3103G01N1/2226G01N1/28G01N1/40G01N2021/3107
Inventor 周杰杨梅邱世威黎红
Owner YIBIN HAIFENG HERUI
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