Method for improving oxidation yield of hydrogenation liquid in hydrogen peroxide preparation by anthraquinone process

A technology of hydrogen peroxide and hydrogenation solution, applied in peroxide/peroxy hydrate/peroxyacid/superoxide/ozonide, chemical instruments and methods, inorganic chemistry, etc., can solve the danger of increasing oxidation tower equipment problems such as high stability, low stability of hydrogen peroxide, and low yield of hydrogen peroxide products, so as to achieve the effects of increasing product revenue, improving stability, and reducing emissions

Inactive Publication Date: 2013-02-06
LIMING RES INST OF CHEM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Because phosphoric acid is an inorganic acid, it is almost insoluble in the hydrogenation solution, and its stability to hydrogen peroxide is low. When the hydrogenation solution is oxidized in the oxidation tower, the generated hydrogen peroxide decomposes in a large amount, and it increases with the increase of the oxidation efficiency.
This makes the oxidation yield of hydrogenated liquid in the oxidation tower low, the discharge of oxidation residue at the bottom of the tower is large, and the yield of hydrogen peroxide product is low
The hydrogen peroxide content in the oxidation residue is high, the stability is low, and it is easy to decompose
This also increases the danger of the oxidation tower equipment

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] On the device for producing hydrogen peroxide by anthraquinone method, ethylenediaminetetramethylenephosphonic acid and water are mixed according to the mass fraction of 25% ethylenediaminetetramethylenephosphonic acid and 75% water in the phosphoric acid solution preparation tank. Acid solution, through the hydrogenation liquid pump and the hydrogenation liquid whose hydrogenation efficiency is 7.6g / L, the volume ratio is 1:(3×10 4 ) into the oxidation tower to react with air after being mixed, and the oxidation residue is discharged from the bottom of the tower. The oxidation reaction temperature is 50°C, and the pressure of the oxidation tail gas is 0.22MPa. The experimental results are shown in Table 1.

Embodiment 2

[0019] On the same hydrogen peroxide production device, in the phosphoric acid solution preparation tank, citric acid, phosphoric acid, and water are formulated into a compound acid solution according to the mass fraction of citric acid 10%, phosphoric acid 30%, and water 60%. The hydrogenation liquid of the same hydrogenation efficiency of embodiment 1 is by volume ratio 1: (5 * 10 4 ) into the oxidation tower to react with air after mixing. Others are the same as embodiment 1. The experimental results are shown in Table 1.

Embodiment 3

[0021] On the same hydrogen peroxide production device, polyacrylic acid, phosphoric acid, water are made into composite acid solution by mass fraction polyacrylic acid (number average molecular weight 3000) 2%, phosphoric acid 40%, water 58% in the phosphoric acid solution preparation tank, through The hydrogenated liquid pump and the hydrogenated liquid with the same hydrogenation efficiency as in Example 1 are in volume ratio 1: (10×10 4 ) into the oxidation tower to react with air after mixing. Others are the same as embodiment 1. The experimental results are shown in Table 1.

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PUM

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Abstract

The invention discloses a method for improving the oxidation yield of hydrogenation liquid in hydrogen peroxide preparation by an anthraquinone process. In an oxidation process, acid solution entering an oxidation tower is prepared by partially or totally substituting organic acid for phosphoric acid. Composite acid solution comprises, by mass, 2%-30% of the organic acid, 0-40% of phosphoric acid and the balance water, and the volume ration of the composite acid solution to the hydrogenation liquid is 1:(2-10)x10<4>. By the method, the oxidation yield of the hydrogenation liquid can be increased by more than 4%, oxidation residual liquid discharge amount is decreased by more than 40%, and H2O2 stability degree of oxidation residual liquid is increased from 43% to be more than 82%. Safety of oxidation equipment is improved by the aid of increase of the oxidation residual liquid stability degree and decrease of the oxidation residual liquid discharge amount.

Description

technical field [0001] The invention relates to a method for producing hydrogen peroxide by an anthraquinone method, in particular to a method for improving the oxidation yield of hydrogenated liquid. Background technique [0002] At present, the domestic production method of hydrogen peroxide is basically the anthraquinone method, which produces hydrogen peroxide through the circulation of hydrogenation, oxidation, extraction and post-treatment of the working fluid. The oxidation yield of hydrogenated liquid is an important indicator of the hydrogen peroxide production process by anthraquinone method, and its value directly affects the discharge of oxidation raffinate and the yield of hydrogen peroxide product. [0003] In the oxidation process, generally phosphoric acid aqueous solution (phosphoric acid mass concentration 25% to 45%) is first mixed with hydrogenated liquid (ie organic phase) in a volume ratio of 1: (5 to 10×10 4 ) after mixing, enter the oxidation tower t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B15/023
Inventor 洪焱根冯彬马俊郭晓冉王魁张明风
Owner LIMING RES INST OF CHEM IND
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