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Method for quickly preparing peracetic acid through continuous flow

A peracetic acid and fast technology, which is applied in the preparation of peroxygen compounds, chemical instruments and methods, and the preparation of organic compounds, can solve the problems of large equipment investment, high safety risks, and high manufacturing costs, and achieve fast mass and heat transfer , improve reaction efficiency, and occupy a small area of ​​equipment

Pending Publication Date: 2020-06-26
CHINA TIANCHEN ENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] In view of this, the present invention aims to propose a method for the rapid preparation of peracetic acid in continuous flow, to overcome the long reaction time, low production efficiency, relatively complicated process, large equipment investment, high manufacturing cost and safety risks in the prior art. higher question

Method used

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  • Method for quickly preparing peracetic acid through continuous flow
  • Method for quickly preparing peracetic acid through continuous flow

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] One enhanced mixed microchannel module was selected as the pre-mixed preheating module, six enhanced mixed microchannel modules were used as the reaction module, and one enhanced mixed microchannel module was selected as the cooling module to form a continuous flow microchannel reaction system according to the reaction process.

[0033] The microchannel structure of each module is an enhanced mixed channel heart-shaped structure, and the channel diameter is 0.5-10mm; as for the number of modules, it is mainly to ensure that there is enough residence time.

[0034] The heat transfer medium of the preheating module and the reaction module is heat transfer oil, and the heat transfer medium of the cooling module is ethylene glycol / ethanol. According to the forced heat transfer principle of the microchannel reactor, only two temperature measuring points are set at the feed inlet and outlet of the reactor. Before the reaction, the microchannel reaction system and connecting p...

Embodiment 2

[0040] Use the microchannel reactor identical with embodiment 1, and according to same connection mode and control method. In this example, the reaction conditions were changed.

[0041] Step (1): According to the 1.1:1 molar ratio of acetic acid and hydrogen peroxide, mix acetic acid and 70wt% hydrogen peroxide, then add 0.5wt% mass fraction of 98% concentrated sulfuric acid and 0.3wt% of the total mass of the reaction solution respectively The ethylenediaminetetraacetic acid was mixed evenly, and the reaction liquid mixture was continuously and stably pumped into the microchannel reaction system through the plunger pump, and the temperature of the heat exchanger of the preheating module was set at 80°C.

[0042] Step (2): After the step (1) is preheated, the reaction mixture continuously enters the microchannel reaction module, the temperature of the heat exchanger of the reaction module is set to 80°C, the back pressure valve is adjusted to maintain the pressure of the reac...

Embodiment 3

[0046] Use the microchannel reactor identical with embodiment 1, and according to same connection mode and control method. In this example, the reaction conditions were changed.

[0047] Step (1): According to the 4:1 molar ratio of acetic acid and hydrogen peroxide, mix acetic acid and 30wt% hydrogen peroxide, then add 5wt% methanesulfonic acid and 0.5wt% sodium phosphate of the total mass of the reaction solution and mix Evenly, continuously and stably pump the reaction solution mixture into the microchannel reaction system through the plunger pump, and set the temperature of the heat exchanger of the preheating module to 148°C.

[0048] Step (2): After preheating in step (1), the reaction mixture continuously enters the microchannel reaction module. Set the temperature of the heat exchanger of the reaction module to 148° C., adjust the back pressure valve to maintain the pressure of the reaction system at 1.3 MPa, and set the column The plug pump flow was such that the rea...

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Abstract

The invention provides a method for quickly preparing peracetic acid by continuous flow, which utilizes a continuous flow micro-channel reactor for reaction, and comprises the following steps: 1) mixing acetic acid, a hydrogen peroxide solution, a catalyst and a stabilizer, and introducing the mixture into a micro-channel reaction preheating module; (2) enabling the mixture preheated in the step (1) to continuously enter a micro-channel reaction module, wherein the reaction temperature range is 80-150 DEG C, the pressure is maintained at 0.5-2.0 MPa, and the retention time is 10-200 seconds; and 3) enabling a product obtained at the outlet of the micro-channel reaction module in the step 2) to enter a cooling module. By utilizing the characteristics of the micro-channel reactor, the peroxyacetic acid can be quickly prepared by continuous flow, and compared with the traditional process, the method has the advantages that the reaction time is greatly shortened, the production efficiencyis improved, the safety risk is effectively reduced, and industrial amplification and production are easy to perform.

Description

technical field [0001] The invention belongs to the fields of fine chemical industry and pharmaceutical chemical industry, in particular to a method for the rapid preparation of peracetic acid in continuous flow. Background technique [0002] Peracetic acid (CH 3 COOOH) is a colorless transparent liquid with strong oxidizing properties. It is widely used in material synthesis in the chemical industry, diesel oil desulfurization in the petroleum industry, fabric bleaching in the light textile industry, and sterilization in the medical and health field. More specifically, in chemical synthesis, peracetic acid can be used as an epoxidant to epoxidize olefins to prepare epoxy monomers for the synthesis of propylene oxide, caprolactam, glycerin, epoxy plasticizers, valerolactone and caprolactone etc.; in the medical field, peracetic acid is a high-efficiency broad-spectrum chemical disinfectant, which has the advantages of low concentration, strong bactericidal effect, short dis...

Claims

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Application Information

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IPC IPC(8): C07C407/00C07C409/26
CPCC07C407/00B01J19/0093
Inventor 王聪杨克俭吴昊冯传密杨琦武刘喆吕金昆白世杰武金丹黄冠博
Owner CHINA TIANCHEN ENG
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