Unlock instant, AI-driven research and patent intelligence for your innovation.

Online testing equipment and method for acidity of oxidation solution or alkalinity of circulating working solution in process of preparing hydrogen peroxide by anthraquinone method

A hydrogen peroxide, cyclic work technology, applied in chemical analysis, material analysis, instruments and other directions using titration method, can solve the problems of lag in detection results, difficult to achieve accurate separation of two phases, long process of sampling and analysis, etc. The effect of reducing detection lag, avoiding emulsification, and fast analysis

Pending Publication Date: 2022-04-08
LIMING RES INST OF CHEM IND
View PDF8 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The current acidity and alkalinity analysis methods have the following disadvantages: manual on-site sampling, manual shaking extraction, manual titration are required, and detection is required every hour, which is a large workload; manual operation has large errors and poor repeatability; sampling , The analysis process is long and time-consuming, and the detection results lag behind, which brings certain difficulties to the process adjustment
However, this method requires quantitative sampling of circulating working fluid and pure water, automatic extraction or stirring, automatic quantitative separation of oil-water two-phase, automatic cleaning of extraction column and stirring tank; the whole system requires two-phase extraction operation, and in practical applications, the working fluid It is easy to produce an emulsified phase with pure water, and it is difficult to achieve accurate separation of the two phases; during automatic sampling, it is very easy for the sampling valve to entrain air to the production device, which poses a safety hazard

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Online testing equipment and method for acidity of oxidation solution or alkalinity of circulating working solution in process of preparing hydrogen peroxide by anthraquinone method
  • Online testing equipment and method for acidity of oxidation solution or alkalinity of circulating working solution in process of preparing hydrogen peroxide by anthraquinone method
  • Online testing equipment and method for acidity of oxidation solution or alkalinity of circulating working solution in process of preparing hydrogen peroxide by anthraquinone method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] A 200,000-ton / year (27.5% basis, the same below) hydrogen peroxide production plant installs the above-mentioned equipment to test the acidity of the oxidizing solution. The steady flow valve used is a pressure reducing valve, the volume of the quantitative loop is 10mL, the titration solution is ethanol, the titration solvent is ethanol, the titration solute is sodium hydroxide, the titration reagent concentration is 0.01mol / L, and the cleaning water is HCl aqueous solution with pH=4. Sampling and analysis was performed every hour (10-15 minutes) and compared with the simultaneous manual analysis (40-60 minutes). The results are shown in Table 1.

[0047] Table 1 Comparison of the acidity results of the oxidizing solution obtained by online testing and manual analysis.

[0048]

Embodiment 2

[0050] A 200,000-ton / year hydrogen peroxide production plant installed the above-mentioned equipment to test the acidity of the oxidizing solution. The steady flow valve used is a needle valve, the volume of the quantitative loop is 20mL, the titration solution is C9 heavy aromatic hydrocarbon, the titration solvent is methanol, the titration solute is sodium hydroxide, the titration reagent concentration is 0.001mol / L, and the cleaning water is HCl aqueous solution with pH=4.5 . Sampling and analysis was performed every hour (10-15 minutes), and compared with the simultaneous manual analysis (40-60 minutes), the results are shown in Table 2.

[0051] Table 2 Comparison of the acidity results of the online test with the manual analysis results.

[0052]

Embodiment 3

[0054] A 200,000-ton / year hydrogen peroxide production plant installed the above-mentioned equipment to test the acidity of the oxidizing solution. The steady flow valve used is a needle valve, the volume of the quantitative loop is 50mL, the titration solution is mesitylene, the titration solvent is a mixture of ethanol and n-propanol, the titration solute is potassium hydroxide, the titration reagent concentration is 0.01mol / L, and the cleaning water is pH =5 HCl aqueous solution. Sampling and analysis was performed every hour (10-15 minutes) and compared with the simultaneous manual analysis (40-60 minutes). The results are shown in Table 3.

[0055] Table 3 Comparison of the acidity results of the oxidizing solution obtained by online testing and manual analysis.

[0056]

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
volumeaaaaaaaaaa
volumeaaaaaaaaaa
Login to View More

Abstract

The invention relates to online testing equipment and method for acidity of oxidation liquid or alkalinity of circulating working solution in a process of preparing hydrogen peroxide by an anthraquinone method, the online testing equipment comprises an automatic quantitative sampling system and an automatic titration system, and the automatic quantitative sampling system comprises a six-way valve, a quantitative loop, a three-way valve and a steady flow valve; the automatic titration system comprises a potentiometric titration cell, an electrode and quantitative titration equipment; the six-way valve, the three-way valve and the steady flow valve are connected in sequence; the quantitative ring is connected with the six-way valve; and the automatic sampling system is connected with the potentiometric titration system. According to the invention, online automatic sampling, titration and result analysis can be realized; inert gas is adopted to continuously purge the six-way valve group and is isolated from air, so that the air is prevented from entering a process system; the extraction operation is not needed, the emulsification phenomenon caused by mixing of a working solution and pure water is avoided, the analysis speed is high, the time from sampling to analysis completion is less than or equal to 15 minutes, and the detection hysteresis is greatly reduced.

Description

technical field [0001] The invention relates to online testing of the acidity of the oxidizing solution and the alkalinity of the circulating working solution in the hydrogen peroxide process of the anthraquinone method, in particular to an online testing device for the acidity of the oxidizing solution or the alkalinity of the circulating working solution in the process of preparing hydrogen peroxide by the anthraquinone method and methods. Background technique [0002] Hydrogen peroxide is a green oxidizing agent, most of hydrogen peroxide in the world is produced by anthraquinone method. In the anthraquinone hydrogen peroxide production technology, the working fluid circulates in the system in the order of hydrogenation, oxidation, extraction, and post-treatment. In the traditional anthraquinone hydrogen peroxide production technology, since the post-treatment process adopts alkali treatment process, the hydrogenation liquid and the circulating working liquid are weakly ...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): G01N31/16G01N35/00
Inventor 庞飞申敬敬柴春玲白立光沈冲赵晓东
Owner LIMING RES INST OF CHEM IND