System and method for continuously monitoring acidity of oxidation solution in hydrogen peroxide process

Abstract

Provided is a system and method for continuously monitoring the acidity of an oxidation solution in a hydrogen peroxide process. The system comprises an injection pump, a multi-position rotary valve, a solution storage bucket, an overflow ring, a liquid-liquid extraction device, an acidity measuring device, a signal acquisition and transmission processing device and the like. The oxidation solution enters the overflow cup through a pipe, is mixed with an extraction solvent and then enters the liquid-liquid extraction device, even stirring and mixing are performed, standing is performed, the acidity measuring device measures the acidity of the obtained lower-layer extracting liquor, and the acidity is sent to a data control center by the signal acquisition and transmission processing device. Online monitoring of the acidity of the oxidation-section oxidation solution in the hydrogen peroxide process can be achieved, the system and method can be used for controlling the oxidation step of the hydrogen peroxide process, the dangerousness of manual field sampling can be reduced, personal errors can be decreased, and a measurement period can be shortened.

Description

technical field [0001] The invention relates to the technical field of liquid detection, in particular to a continuous monitoring system and monitoring method for the acidity of oxidation liquid in a hydrogen peroxide process. Background technique [0002] Since the stability of hydrogen peroxide is greatly affected by the pH value, the neutral solution (pH=7) is the most stable; when the pH value is low (pH<7, acidic), it has little effect on the stability; but when the pH value When the pH is high (pH>7, it is alkaline), the stability deteriorates sharply, and the decomposition speed is obviously accelerated. [0003] Currently, most hydrogen peroxide production uses the anthraquinone method. The anthraquinone method uses anthraquinone compounds as hydrogen carriers (or working carriers) to react hydrogen and oxygen to generate hydrogen peroxide. The main production processes include hydrogenation process, oxidation process, extraction process and purification proce...

AI Technical Summary

Problems solved by technology

However, the disadvantages of spectrophotometry are: the color development time is long, and it needs to be placed at room temperature for about 15-30 minutes; the reducing agent ascorbic acid is easily oxidized, which is not conducive to long-term storage, so it is not suitable for use.

Therefore, the offline analysis method has the disadvantages of high risk of on-site sampling, long sampling and analysis time, high requirements for operators, low degree of automation, and poor timeliness.

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