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Method for continuously preparing peroxymonosulfuric acid by using microchannel reactor

A microchannel reactor, microchannel technology, applied in chemical instruments and methods, chemical/physical/physical chemical reactors, peroxides/peroxyhydrates/peroxyacids/superoxides/ozone oxides, etc., Achieve the effect of improving yield, less loss of active material and large specific surface area

Pending Publication Date: 2021-12-28
ZHEJIANG JINKE CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0009] However, the preparation of peroxymonosulfuric acid by microchannel reactor has not been reported yet.

Method used

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  • Method for continuously preparing peroxymonosulfuric acid by using microchannel reactor
  • Method for continuously preparing peroxymonosulfuric acid by using microchannel reactor

Examples

Experimental program
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Effect test

Embodiment 1

[0030] The hydrogen peroxide with a mass fraction of 70% and the sulfuric acid with a mass fraction of 98% were transported into the microchannel reactor at the same time according to the molar ratio of 1:1.7. The temperature of the reaction solution was controlled at 15°C and the reaction residence time was 2 minutes. Two sets of reaction modules were used. The liquid holding capacity of each group of reaction modules is 150mL, and the characteristic dimension of the microchannel is 0.4mm, and a persulfuric acid solution is prepared. The measured active oxygen content in the peroxymonosulfuric acid solution is 7.01%, and the yield of peroxymonosulfuric acid is 95.8% (the yield is based on hydrogen peroxide).

Embodiment 2

[0032] The hydrogen peroxide with a mass fraction of 50% and the sulfuric acid with a mass fraction of 115% are transported into the microchannel reactor at the same time according to the molar ratio of 1:2.1 respectively. The temperature of the reaction solution is controlled at 25°C and the reaction residence time is 3 minutes. Three sets of reaction modules are used. , the liquid holding capacity of each group of reaction modules is 300mL, the characteristic scale of the microchannel is 0.4mm, and a solution containing peroxymonosulfuric acid is prepared. The measured active oxygen content in the peroxymonosulfuric acid solution is 6.23%, and the yield of peroxymonosulfuric acid is 96.2% (the yield is based on hydrogen peroxide).

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Abstract

The invention discloses a method for continuously preparing peroxymonosulfuric acid by using a microchannel reactor. The method comprises the following step: with hydrogen peroxide and sulfuric acid as raw materials, simultaneously and continuously conveying the raw materials into the micro-channel reactor, wherein a reaction molar ratio of the hydrogen peroxide to the sulfuric acid is controlled to be 1: (1.1-5), a reaction temperature is controlled to be -15 DEG C to 65 DEG C and reaction retention time is controlled to be 2 seconds to 10 minutes. According to the method, the peroxymonosulfuric acid is prepared by adopting the microchannel reactor, the mass transfer efficiency and the heat transfer efficiency of the microchannel reactor are very high; continuous reaction is adopted, so the time consumption of a working procedure can be effectively shortened, and production efficiency is improved; moreover, reactants can be in full contact, and the yield of the product peroxymonosulfuric acid is improved; and meanwhile, reaction heat can be removed more quickly, the temperature of a reaction system can be regulated and controlled in time, accurate control over the reaction temperature is achieved, the possibility of safety and quality accidents is reduced, and safe and efficient production is achieved.

Description

technical field [0001] The invention belongs to the technical field of inorganic peroxide preparation, in particular to a method for continuously preparing peroxymonosulfuric acid by using a microchannel reactor. Background technique [0002] Persulfuric acid (also named persulfuric acid, peroxysulfuric acid, caroic acid) is a highly efficient strong oxidant, its electrode potential E=+2.51V, much higher than other oxidant electrode potentials, such as sodium chlorate (electrode potential E =+1.45V), manganese dioxide (electrode potential E=+1.21V). Peroxymonosulfuric acid is chemically unstable, easy to decompose and hydrolyze. When heated or reacted with metal ions such as iron, copper, manganese, nickel, cadmium, etc., it can undergo violent decomposition and precipitate active oxygen. In addition, persulfuric acid is highly prone to explosion when mixed with aliphatic compounds and aromatic compounds. Peroxymonosulfuric acid is widely used in advanced oxidation of hyd...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B15/06B01J19/00
CPCC01B15/06B01J19/0093
Inventor 张晓栋殷飞魏一帆章勇坚杨栋栋
Owner ZHEJIANG JINKE CHEM
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