Online automatic monitoring method and device for residual concentration of hydrogen peroxide

Abstract

The invention relates to the technical field of inorganic matter monitoring and particularly relates to an online automatic monitoring method and device for residual concentration of hydrogen peroxide. On the basis of an automatic measurement process, hydrogen peroxide in raffinate is extracted to a water phase and reacts with ammonium molybdate in the water phase to generate a stable peroxymolybdic acid compound, the absorbance of the peroxymolybdic acid compound is measured at 365 nm, absorbance is substituted into a calibration curve, and the residual concentration of hydrogen peroxide is obtained through correction fitting calculation; monitoring sensitivity is high, the detection limit is less than 5mg / L, the measurement result is high in precision and accuracy, and the method has very high comparability with a conventional test method; rapid extraction and measurement can be realized, the residual quantity of hydrogen peroxide in an oil phase of raffinate can be measured, and the content of hydrogen peroxide in water can also be measured; full-automatic real-time monitoring can be realized, and a lot of human resources are saved; in the monitoring process, the amount of adopted samples and reagents is small, the amount of generated waste water and waste liquid is small, and maintenance is convenient.

Description

technical field [0001] The invention relates to the technical field of inorganic substance monitoring, in particular to an online automatic monitoring method and device for residual hydrogen peroxide concentration. Background technique [0002] Hydrogen peroxide (commonly known as hydrogen peroxide, chemical formula H 2 o 2 ) industrial production process mainly includes hydrogenation reaction process, oxidation reaction process, extraction and purification process. After the extraction process, the raffinate (oil phase) contains a small amount of hydrogen peroxide. This part of hydrogen peroxide will continue to react with the palladium catalyst in the hydrogenation reaction, release hydrogen gas, and meet the hydrogen gas in the hydrogenation reaction stage to reach a certain level. Explosion will occur when the amount is high, so it is necessary to monitor the content of hydrogen peroxide in the raffinate in real time. Most hydrogen peroxide production enterprises need...

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Problems solved by technology

Most hydrogen peroxide production enterprises need 24 hours of manual sampling to the laboratory, and then extract the raffinate with pure water several times, and then use iodometric method or potassium permanganate titration to measure the hydrogen peroxide content in it, so as to monitor the extraction. The purpose of residual hydrogen peroxide in the remaining liquid not only consumes a lot of manpower and material resources, but also has low operating efficiency and large test errors, making it difficult to achieve 24-hour real-time and accurate monitoring

[0003] At present, the hydrogen peroxide online analysis instruments on the market mainly use physical sensors or titration methods for monitoring. Although manual operations can be reduced, the monitoring object is generally the hydrogen peroxide content in water or gas, which is relatively limited and not universally practical. sex

So far, there have been no reports on the on-line monitoring of residual hydrogen peroxide in the raffinate oil phase

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