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A method for improving the oxidation yield of hydrogen peroxide produced by anthraquinone method

A technology of hydrogen peroxide and anthraquinone method, applied in chemical instruments and methods, peroxide/peroxyhydrate/peroxyacid/superoxide/ozonide, inorganic chemistry, etc., can solve the cooling effect of circulating water Unsatisfactory, affecting oxidation yield, flash explosion and other problems

Active Publication Date: 2017-10-03
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There are several problems in the oxidation process of hydroanthraquinone in the prior art: (1) The oxidation reaction is an exothermic reaction, and the temperature is constantly rising during the reaction process. It will cause the decomposition of hydrogen peroxide, resulting in a low oxidation yield; (2) During the oxidation process, a large amount of air and a large amount of hydrogenated liquid containing aromatics are reacted. If the temperature rises or is not well controlled, the flash point of the hydrogenated liquid will be reached, causing flash At the same time, it will also cause the decomposition of hydrogen peroxide, causing an explosion accident
(3) The amount of air in the oxidation process is very large, and the oxygen content in the air is limited, so the oxidation time is longer, which will cause the decomposition of hydrogen peroxide while causing side reactions
In CN201809195U and CN201817279U, the reaction temperature control of the oxidation tower adopts the built-in water cooler to take heat. The shortcoming of this structure is that the heat taking effect of cooling with circulating water is not ideal, and because the built-in water cooler will affect the heat in the tower. The flow pattern and mass transfer effect of gas-liquid fluid flow are adversely affected, thereby affecting the oxidation yield

Method used

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  • A method for improving the oxidation yield of hydrogen peroxide produced by anthraquinone method

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Embodiment 1

[0030] The oxidation tower is divided into upper and lower sections, and each section of the tower is divided into primary, secondary and tertiary reaction zones from bottom to top. The heights of the towers are 3500mm, 1700mm and 1700mm respectively, the total height of a single tower section is 6900mm, and the total volume of the oxidation tower is 3.88m 3 . First, ~45°C oxygen-containing gas I 155.6Nm 3 / h is directly introduced into the lower tower of the oxidation tower, and the oxygen-containing gas II 24Nm with a temperature of 22°C and a concentration of 35% is introduced into the middle of the oxidation tower and the lower tower 3 / h, introduce 60% oxygen-containing gas II9.34Nm at a temperature of 15°C at the upper position of the oxidation upper and lower towers 3 / h. Hydrogenated liquid flow rate 4.97m 3 / h, during the reaction, the measured reaction temperatures of the upper, middle and lower parts of the oxidation tower were 52-54°C, 50-52°C, 48-50°C, and the...

Embodiment 2

[0032] The oxidation tower is divided into upper and lower sections, and each section is divided into primary, secondary and tertiary reaction zones from bottom to top. The tower diameters of the three zones of the two tower sections are 1000mm, 800mm, 700mm respectively The heights of the towers are 3400mm, 1400mm and 1400mm respectively, the total height of a single tower section is 6200mm, and the total volume of the oxidation tower is 3.91m 3 . First, the oxygen-containing gas I 133.37 Nm 3 / h is directly introduced into the lower tower of the oxidation tower, and the oxygen-containing gas II21.34Nm with a temperature of 20°C and a concentration of 35% is introduced into the middle of the upper and lower oxidation towers 3 / h, introduce 18.67Nm of oxygen-containing gas II18.67Nm with a temperature of 12°C and a concentration of 60% at the upper part of the oxidation upper and lower towers 3 / h. Hydrogenated liquid flow rate 4.97m 3 / h, during the reaction, the measured...

Embodiment 3

[0034] The oxidation tower is divided into upper and lower sections, and each section is divided into primary, secondary and tertiary reaction zones from bottom to top. The tower diameters of the two tower sections and the three zones are all 800mm, and the height of a single tower section is 6900mm. The total volume of the oxidation tower is 3.53m 3 . First, the oxygen-containing gas I 144.29 Nm 3 / h is directly introduced into the lower tower of the oxidation tower, and the oxygen-containing gas II 27.83Nm with a temperature of 20°C and a concentration of 30% is introduced into the middle of the oxidation tower and the lower tower 3 / h, introduce 11.9Nm oxygen-containing gas II with a temperature of 12°C and a concentration of 70% at the upper part of the oxidation upper and lower towers 3 / h. Hydrogenated liquid flow rate 4.97m 3 / h, during the reaction, the measured reaction temperatures of the upper, middle and lower parts of the oxidation tower were 52-54°C, 50-52°C,...

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Abstract

The invention discloses a method for improving the oxidation yield in production of hydrogen peroxide by an anthraquinone method. The method comprises the following steps: partitioning each of an upper section tower and a lower section tower of an oxidation tower into a primary reaction zone, a secondary reaction zone and a tertiary reaction zone from bottom to top; introducing a hydrogenation solution containing anthraquinone into the primary reaction zone of the upper section tower of the oxidation tower, an oxygen-containing gas I into the primary reaction zone of the lower section tower of the oxidation tower, a low-temperature oxygen-containing gas II into the secondary reaction zones of the upper section tower and the lower section tower in two strands, and a low-temperature oxygen-containing gas III into the tertiary reaction zones of the upper section tower and the lower section tower in two strands; and sequentially performing an oxidation reaction on the hydrogenation solution and the oxygen-containing gases in the primary reaction zone, the secondary reaction zone and the tertiary reaction zone of the upper section tower from bottom to top, performing gas-liquid separation on reaction products, treating a gas phase in an expansion refrigeration system to obtain a low-temperature tail gas, introducing a liquid phase into the primary reaction zone of the lower section tower, sequentially performing an oxidation reaction on the liquid phase and the oxygen-containing gases in the primary reaction zone, the secondary reaction zone and the tertiary reaction zone of the lower section tower from bottom to top, performing gas-liquid separation on the oxidized products, allowing a liquid phase to enter the next process, and introducing a gas phase into the primary reaction zone of the upper section tower for a continuous reaction. The method can reduce the oxidation time and improve the oxidation yield while ensuring complete oxidation, and contributes to improving the safety of an oxidation process.

Description

technical field [0001] The invention relates to a method for improving the oxidation yield of hydrogen peroxide produced by an anthraquinone method. Background technique [0002] The production of hydrogen peroxide by the anthraquinone method uses 2-ethylanthraquinone (EAQ) as the working carrier, heavy aromatics (Ar), trioctyl phosphate (TOP) or other components as the working solvent to prepare the working solution, and undergoes anthraquinone hydrogenation , hydrogen anthraquinone oxidation, pure water extraction and working fluid post-treatment processes to obtain hydrogen peroxide products. [0003] During the hydrogen anthraquinone oxidation process, the automatic oxidation reaction between the working fluid and a large amount of oxygen-containing gas (usually air) occurs in the oxidation tower. In order to ensure complete oxidation and make full use of the oxygen in the oxygen-containing gas, the existing hydrogen peroxide production The oxidation tower in the techno...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B15/023
Inventor 杨秀娜齐慧敏王昊晨阮宗琳
Owner CHINA PETROLEUM & CHEM CORP