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Equipment for continuous online analysis of alkalinity of working solution in anthraquinone-process preparation of hydrogen peroxide and use method of equipment

A technology for analyzing equipment and working fluids, applied in chemical instruments and methods, analytical materials, peroxides/peroxyhydrates/peroxyacids/superoxides/ozonides, etc. Problems such as real pH, non-guiding significance for production, complex components, etc., to achieve continuous online analysis, reduce labor intensity, and achieve accurate and reliable results

Pending Publication Date: 2021-06-01
LIMING RES INST OF CHEM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the actual operation process, due to the complex composition of the working fluid, the pH value measured by this method cannot better reflect the real pH of the working fluid, and the dispersion is very large, which has no guiding significance for production

Method used

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  • Equipment for continuous online analysis of alkalinity of working solution in anthraquinone-process preparation of hydrogen peroxide and use method of equipment
  • Equipment for continuous online analysis of alkalinity of working solution in anthraquinone-process preparation of hydrogen peroxide and use method of equipment
  • Equipment for continuous online analysis of alkalinity of working solution in anthraquinone-process preparation of hydrogen peroxide and use method of equipment

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] A hydrogen peroxide model test device is installed with the above-mentioned continuous online analysis equipment for the alkalinity of the working fluid. The working fluid controls the flow rate of 100L / h and enters the extraction column from the bottom of the extraction column (the ratio of height to diameter is 100:1, and the metal mesh θ ring is highly efficient packing). Pure water controls the flow rate of 10L / h to extract the water-soluble lye in the working fluid.

[0025] The operator takes samples at the site every hour. The alkalinity of the samples is measured in the laboratory using an off-line method. At the same time, the pH value is measured with an on-site alkalinity online analyzer, and the alkalinity is calculated using a linear fitting curve. The experimental results are shown in Table 1.

[0026] It can be seen from Table 1 that the error between the offline test alkalinity value and the linear fitting curve alkalinity calculation value is between ±0...

Embodiment 2

[0030] A 100,000-ton / year (27.5%) hydrogen peroxide plant is installed with the above-mentioned continuous on-line analysis equipment for the alkalinity of the working fluid. Net θ ring high-efficiency packing), pure water control flow rate 100L / h to extract the water-soluble lye in the working fluid.

[0031] Every 2 hours, the operator goes to the site to take samples, and the samples go to the laboratory to measure their alkalinity offline. At the same time, the on-site alkalinity online analyzer is used to measure the pH value, and the linear fitting curve is used to calculate the alkalinity. The experimental results are shown in Table 2.

[0032] Table 2 offline test alkalinity value and linear fitting curve alkalinity calculation value comparison

[0033]

[0034] It can be seen from Table 2 that the error between the offline test alkalinity value and the linear fitting curve alkalinity calculation value is between ±0.02mg / L, which meets the test requirement of error...

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Abstract

The invention discloses equipment for continuous online analysis of the alkalinity of a working solution in anthraquinone-process preparation of hydrogen peroxide and a use method of the equipment. The equipment comprises an extraction column (1), wherein the lower part of the extraction column (1) is connected with a working solution feeding flow control valve (2), the bottom of the extraction column (1) is connected with an online pH value analyzer (5) and a quantitative waste liquid discharge valve (6), and a pure water flow control valve (3) and a waste working liquid valve (4) are arranged at the upper part of the extraction column (1). The use method comprises the following steps: (1) establishing a corresponding relation curve between the pH value of an extract and the alkalinity of the working solution; (2) measuring the pH value of a water phase of the extract; and (3) checking the alkalinity of the working solution. According to the equipment and the method, the pH value of the extracted water phase of the working solution is measured by adopting a pH meter, the real alkalinity of the working solution is reflected, and continuous online analysis of the alkalinity of the working solution can be realized; and results are accurate and reliable and are not influenced by human factors, the labor intensity of workers is effectively reduced, and contact between the workers and the working solution is reduced.

Description

technical field [0001] The invention belongs to the technical field of preparing hydrogen peroxide by anthraquinone method. Background technique [0002] The anthraquinone method for producing hydrogen peroxide uses anthraquinone compounds as the carrier of the working fluid to react hydrogen and oxygen under certain conditions to form hydrogen peroxide. The main production processes include hydrogenation process, oxidation process, extraction process and post-treatment process. In order to reduce the content of hydrogen peroxide in the working fluid of the hydrogenation system and ensure the regeneration effect of anthraquinone degradation products in the working fluid, the working fluid after the post-treatment process needs to reach a certain weak alkalinity. [0003] The alkalinity analysis of the working solution in the traditional anthraquinone method to prepare hydrogen peroxide is an acid-base titration method, and the analysis frequency is once an hour. Manual on-s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B15/023G01N33/00
CPCC01B15/023G01N33/00
Inventor 张晓斌贺江峰沈冲夏红勋李文涛
Owner LIMING RES INST OF CHEM IND
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