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Method for measuring content of ethylbenzene hydrogen peroxide

A technology for the content of ethylbenzene hydrogen peroxide, which is applied in the field of spectral analysis, can solve the problems of complex operation of the determination method, inability to realize on-line analysis, and inability to realize on-line analysis, and achieve the effects of avoiding moisture interference, good rigidity, and high accuracy

Active Publication Date: 2020-01-10
WANHUA CHEM GRP
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Problems solved by technology

For the quantitative determination of ethylbenzene hydrogen peroxide, a rapid determination method was introduced in "A Simple Method for Analysis of Peroxide Content in Hydrogen Peroxide Aqueous Solution" published by You Qingliang et al. The principle is based on the potassium permanganate method and density method, the determination method is complicated to operate, the end point indication is not obvious, and the repeatability is poor
The method optimization, such as the selection of the amount of iodide ion, the selection of the acidity of the solution, the selection of the reaction time, etc., was introduced in the "analysis of hydrogen peroxide content by iodometric method" published by Li Xin et al. The analysis method has been further improved, but This method still cannot realize the online analysis of process control
[0004] To sum up, the traditional peroxide analysis method is complex in operation, poor in repeatability, and low in accuracy. It cannot achieve online analysis in petrochemical industry analysis. Therefore, it is urgent to develop a method that is easy to operate, good in repeatability, and high in accuracy. And it is suitable for the new analysis method of online analysis

Method used

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  • Method for measuring content of ethylbenzene hydrogen peroxide

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] The material of the liquid pool used in Example 1 is: sodium chloride, potassium bromide and calcium fluoride, with a mass ratio of 1:8:3. Tablet pressing is carried out under the irradiation of an infrared lamp, and the infrared lamp is a special infrared baking lamp for an infrared spectrometer, and the power is 275W.

[0038] (1) Determination of the characteristic peak absorption band

[0039] Select 30% hydrogen peroxide aqueous solution, inject it into the liquid pool with a disposable syringe, set the instrument parameters, and the infrared spectrum obtained from the test is as follows: figure 1 As shown in the a curve, it can be determined that the absorption band of the characteristic peak is 1230cm -1 ~1500cm -1 .

[0040] (2) Establishment of standard curve

[0041]Select 40 standard samples of known EBHP content (sample concentrations are: 4.59%, 7.87%, 33.83%, 7.53%, 34.05%, 33.97%, 31.85%, 8.00%, 8.21%, 8.19%, 8.26%, 6.25% %, 23.06%, 9.20%, 33.65%, 23...

Embodiment 2

[0053] Use the following materials to make a liquid pool: sodium chloride, potassium bromide, and calcium fluoride, with a mass ratio of 1:4:5. Measure according to the process of embodiment 1, after measuring 40 samples, the liquid pool still has no obvious change, and can continue to be used.

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Abstract

The invention provides a method for measuring the content of ethylbenzene hydrogen peroxide. The method comprises the following steps: acquiring an infrared spectrum of a standard substance, and obtaining infrared spectrum characteristic variables of all standard substances through a partial least squares regression method within the absorption band of 1,230-1,500 cm<-1>, obtaining a standard curve of the infrared spectrum characteristic variables and the ethylbenzene hydrogen peroxide content, and obtaining the ethylbenzene hydrogen peroxide content in the to-be-detected sample according to the standard curve. A measurement result obtained by the method provided by the invention has higher accuracy, reproducibility and sensitivity; compared with a traditional iodometry, the method is simple and convenient to operate, saves time and labor and is environment friendly, and has important guiding significance for central control analysis in the petrochemical industry.

Description

technical field [0001] The invention relates to the field of spectral analysis, in particular to a method for measuring the content of ethylbenzene hydrogen peroxide by infrared spectroscopy. Background technique [0002] The propylene oxide / styrene (PO-SM) co-production process uses ethylbenzene as a raw material, reacts with air to prepare the intermediate product ethylbenzene hydroperoxide (EBHP), and reacts with propylene after concentration to form propylene oxide and α-phenylethanol. The refined α-phenylethanol is dehydrated to generate styrene. Ethylbenzene hydroperoxide is a hydrogen atom on hydrogen peroxide replaced by ethylbenzene. Compounds containing peroxy (-O-O-) are usually chemically active, easy to decompose and explode, and pose a safety hazard. The content of ethylbenzene hydroperoxide has important guiding significance for the PO-SM project, so it is necessary to quickly and accurately quantitatively analyze ethylbenzene hydroperoxide in the production ...

Claims

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Application Information

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IPC IPC(8): G01N21/3577G01N21/09
CPCG01N21/3577G01N21/09
Inventor 邱化敏付帅王家发周建强王庆义周芸黄长荣李晶
Owner WANHUA CHEM GRP
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