Preparation method for sustained release potassium permanganate microcapsule

A technology of potassium permanganate and microcapsules, which is applied in the direction of microcapsule preparation, microsphere preparation, oxidized water/sewage treatment, etc., which can solve the problems of low utilization efficiency, insufficient distribution of oxidants, and difficulty in dispersing, etc., to increase the contact range , reduce non-selective consumption, improve the effect of utilization

Inactive Publication Date: 2013-05-01
HUAQIAO UNIVERSITY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the rapid dispersion and non-selective consumption of potassium permanganate in the form of aqueous solution into the soil make the oxidant distribution in the DNAPLs pollution zone, that is, the high oxidant demand zone insufficient, so that its own utilization efficiency is extremely low
In addition, due to the strong polarity of the surface of potassium permanganate, it is difficult to disperse in non-polar solvents, which also leads to poor pollution repair effect of DNAPLs.

Method used

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  • Preparation method for sustained release potassium permanganate microcapsule
  • Preparation method for sustained release potassium permanganate microcapsule

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preparation example Construction

[0017] 1, a kind of preparation method of sustained-release potassium permanganate microcapsules, it is characterized in that: comprise the following steps:

[0018] (1) Put stearic acid in the reactor, add absolute ethanol, heat in a water bath at 70-80°C, stir well until the stearic acid is completely dissolved; use stearic acid as slow-release potassium permanganate microcapsules shell material.

[0019] (2) Then add polyethylene glycol 4000 and potassium permanganate, ultrasonic 5-10min to disperse potassium permanganate evenly in the solution, then stop ultrasonic and cool naturally below 35°C under stirring to make stearic acid Solubility reduces, with potassium permanganate as the core coagulation and precipitation to obtain slow-release potassium permanganate microcapsules, until the solid is separated out completely, the reaction is completed; wherein, the stirring in the step (2) adopts an electric mixer, and stirring The speed is 150-350rpm; The mass ratio of potas...

Embodiment 1

[0021] Take the shell material stearic acid and place it in a three-necked flask, add absolute ethanol, the mass ratio of the absolute ethanol to stearic acid is 1:1; fully stir at 350rpm, control the temperature of the water bath to 70°C and heat to make the stearin The acid is fully dissolved; then according to the mass ratio of polyethylene glycol 4000: stearic acid = 1: 3, add polyethylene glycol 4000 (PEG4000), and then according to the mass ratio of potassium permanganate: stearic acid = 1: 1, add Potassium permanganate, sonicate for 10 minutes to disperse potassium permanganate evenly in the shell material solution, stop the sonication, stir at a rate of 150rpm while lowering the temperature of the reaction system to below 35°C, and stop the reaction after the solid precipitation is complete.

Embodiment 2

[0023] Take the shell material stearic acid and place it in a three-necked flask, add absolute ethanol, the mass ratio of the absolute ethanol to stearic acid is 1:1; fully stir at 350rpm, control the temperature of the water bath to 80°C and heat to make the stearin The acid is fully dissolved; then according to the mass ratio of polyethylene glycol 4000:stearic acid=1:2, add PEG4000, then according to the mass ratio of potassium permanganate:stearic acid=1:2, add potassium permanganate, ultrasonic 5min , to uniformly disperse potassium permanganate in the shell material solution, stop the ultrasound, stir at a rate of 250rpm while lowering the temperature of the reaction system to below 35°C, and stop the reaction after the solid precipitation is complete.

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Abstract

The invention discloses a preparation method for a sustained release potassium permanganate microcapsule, comprising the following steps that (1), stearic acid is arranged in a reactor, absolute ethyl alcohol is added to the reactor, the reactor is heated in water bath, the solution in the reactor is sufficiently stirred until the stearic acid is completely dissolved; (2), polyethylene glycol 4000 and potassium permanganate are added to the reactor, potassium permanganate is homogeneously dispersed in the solution through ultrasound, the ultrasound is stopped, the solution is stirred and naturally cooled to the temperature of below 35 DEG C, and the reaction is finished after solid is completely dissolved out; and the mass ratio of potassium permanganate to stearic acid is 1:1-1:3. The preparation method for the sustained release potassium permanganate microcapsule solves the problems of low utilization rate of oxidant, high non-preference consumption and mass transfer of oxidant in the process of removing underground water pollutants by the in-situ chemical oxidation of liquid and powder potassium permanganate, and realizes the purposes of sustained release, effective transmission and efficient oxidation of the oxidant.

Description

【Technical field】 [0001] The invention relates to a preparation method of slow-release potassium permanganate microcapsules used for repairing groundwater chlorinated olefin pollutants. 【Background technique】 [0002] With the development of society and economy, a large number of organic solvents are used by human beings in practice. The unreasonable discharge and improper treatment of these organic substances will cause them to enter the environment and pollute groundwater resources. Among them, chlorinated solvents (vinyl chloride) are denser than water and belong to Dense Non-Aqueous Phase Liquid (DNAPL), which are easy to move underground, thereby increasing the depth and breadth of groundwater and soil pollution. , making it very difficult to remediate and remediate, and has become a research hotspot in soil and groundwater pollution remediation abroad. The most common DNAPL pollutants are: trichlorethylene (TCE), tetrachlorethylene (PCE) and other chlorinated hydrocar...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J13/02C02F1/72
Inventor 苑宝玲刘津津付明来陈艳美
Owner HUAQIAO UNIVERSITY
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