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A method for measuring arsenic content in propylene

A technology of propylene and content, applied in the direction of material excitation analysis, fluorescence/phosphorescence, etc., can solve the problems of poor precision and poor data repeatability, and achieve the effects of fast analysis speed, shortened pretreatment time, safe and easy operation

Active Publication Date: 2016-06-08
PETROCHINA CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The common feature of the above methods is that the data repeatability is not good and the precision is poor.

Method used

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  • A method for measuring arsenic content in propylene
  • A method for measuring arsenic content in propylene
  • A method for measuring arsenic content in propylene

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Experimental program
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Embodiment Construction

[0030] The model of the atomic fluorescence instrument used in the embodiment of the present invention is AFS-3100 dual-channel atomic fluorescence photometer, manufactured by Beijing Haiguang Instrument Company. The operating parameters of the atomic fluorescence instrument are set as follows:

[0031] Photomultiplier tube negative high voltage: 300V,

[0032] Atomizer height: 8mm,

[0033] Total lamp current: 50mA,

[0034] Split current: 25mA,

[0035] Carrier gas flow: 300mL / min,

[0036] Shielding gas flow: 800mL / min,

[0037] Measurement method: direct reading of fluorescence intensity or concentration,

[0038] Reading time: 12s,

[0039] Reading delay time: 2s,

[0040] The carrier gas and shielding gas are argon.

[0041] Connect the cylinder containing propylene to the inlet of the gas mass flowmeter, and pass the outlet end of the gas mass flowmeter into the 20mL mixed acid solution through the gas conduit. The concentration of the mixed acid solution is the...

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Abstract

The invention relates to a method for determining an arsenic element in propylene. The method comprises the following steps of introducing propylene into a mixed acid solution to be absorbed, sequentially spraying arsenic standard solutions of different concentrations into an atomic fluorescent spectrometer so as to respectively test the fluorescent intensity, drawing a standard working curve according to the relation of the concentration and the fluorescent intensity in the solution, sequentially spraying samples to be tested into the spectrometer to respectively test the fluorescent intensity, and calculating the content of the arsenic element in the sample to be tested according to the drawn standard working curve. The instrument in the method is simple and convenient to operate, combustible gases such as acetylene gas can be avoided, the repeatability of the method is good, and the result is accurate.

Description

technical field [0001] The invention belongs to a method for determining elements in petroleum products, in particular to a method for determining arsenic in propylene. Background technique [0002] Propylene is the main raw material for the production of polypropylene. Propylene often contains impurities such as sulfur, phosphorus, nitrogen, and arsenic. These impurities can cause catalyst poisoning during the polymerization reaction. It has been reported in literature that when the arsenic content in propylene reaches 60 ppb, the activity of the catalyst will decrease by 30%; when the arsenic content in propylene reaches 120 ppb, the activity of the catalyst will decrease by more than 70%. Therefore, it is very important to accurately determine the arsenic content in propylene raw materials and products. [0003] The current method for determining the arsenic in propylene is to pass propylene into the mixed acid solution, and after the arsenic in the propylene is absorbed...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N21/64
Inventor 何京王飞肖占敏梁迎春姚远王延飞余颖龙汪艳孙莉喻昊王春燕
Owner PETROCHINA CO LTD