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Treatment method for cleaning and recycling polytetrafluoroethylene reaction kettle

A technology of polytetrafluoroethylene and a treatment method, which is applied in the directions of cleaning methods, cleaning methods and utensils using liquids, cleaning hollow objects, etc., can solve the problems of no practical significance, acidic environment of the reaction kettle, and the inner wall is dyed yellow, etc. To achieve the effect of being beneficial to the removal of dirt, improving the ability of dissolution and penetration, and improving the penetration of solvent

Active Publication Date: 2021-07-09
河北中天兰清环境科技有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in frequent chemical material synthesis experiments, it is inevitable that a layer of chemical residue will be attached to the lining of the reactor, which is difficult to clean and scrape off
The most commonly used cleaning method in the laboratory is soaking or boiling with aqua regia. Although it can remove some chemical residues, it is easy to dye the inner wall yellow and cause an acidic environment in the reactor. If you continue to use the reactor for other Chemical synthesis experiments will inevitably cause problems such as inaccurate synthesis and even synthetic pollution. However, each chemical synthesis experiment uses a new reactor, which is expensive and has no practical significance

Method used

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  • Treatment method for cleaning and recycling polytetrafluoroethylene reaction kettle

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Effect test

Embodiment 1

[0020] A treatment method for cleaning and reusing a polytetrafluoroethylene reactor, comprising the steps of:

[0021] (1) At first the polluted polytetrafluoroethylene reactor is collected, soaked for 2h with 10% ethyl acetate solution, then repeatedly scrub the inner and outer walls of the reactor for 3 times, then rinse with tap water; then the reactor is transferred to In an ultrasonic machine equipped with 1L, 9% citric acid / polyethylene glycol-400 mixed solution, perform ultrasonic cleaning at 60°C for 2 hours; then replace the citric acid / polyethylene glycol-400 mixed solution in the ultrasonic machine with Ionized water, continue ultrasonic cleaning for 3 times, each time for 0.5h;

[0022] (2) Take out the polytetrafluoroethylene reactor after cleaning in step (1) and pour 60mL, 6% hydrofluoric acid solution into each reactor, add 0.25g sodium hexametaphosphate, ultrasonically disperse for 20min, Then seal it, install the outer lining of the reaction kettle, and hea...

Embodiment 2

[0025] A treatment method for cleaning and reusing a polytetrafluoroethylene reactor, comprising the steps of:

[0026] (1) At first the polluted polytetrafluoroethylene reactor is collected, soaked for 2h with 10% ethyl acetate solution, then repeatedly scrub the inner and outer walls of the reactor for 3 times, then rinse with tap water; then the reactor is transferred to In an ultrasonic machine equipped with 1L, 8% sulfamic acid / ethylenediaminetetramethylphosphinic acid solution, citric acid / polyethylene glycol-400 mixed solution, ultrasonically clean at 60°C for 2 hours; then put the Replace the sulfamic acid / ethylenediaminetetramethylphosphinic acid solution with citric acid / polyethylene glycol-400 mixed solution with deionized water, and continue ultrasonic cleaning for 3 times, each time for 0.5h;

[0027] (2) Take out the polytetrafluoroethylene reaction kettle after cleaning in step (1) and pour 60mL, 6% hydrofluoric acid solution into each reaction kettle, add 0.3g ...

Embodiment 3

[0030] A treatment method for cleaning and reusing a polytetrafluoroethylene reactor, comprising the steps of:

[0031] (1) At first the polluted polytetrafluoroethylene reactor is collected, soaked for 2h with 10% ethyl acetate solution, then repeatedly scrub the inner and outer walls of the reactor for 3 times, then rinse with tap water; then the reactor is transferred to In an ultrasonic machine equipped with 1L, 5% citric acid / polyethylene glycol-400 mixed solution, perform ultrasonic cleaning at 60°C for 2 hours; then replace the citric acid / polyethylene glycol-400 mixed solution in the ultrasonic machine with Ionized water, continue ultrasonic cleaning for 3 times, each time for 0.5h;

[0032] (2) Take out the polytetrafluoroethylene reactor after cleaning in step (1) and pour 60mL, 5% hydrofluoric acid solution into each reactor, add 0.1g sodium hexametaphosphate, ultrasonically disperse for 20min, Then seal it, install the outer lining of the reaction kettle, and heat...

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Abstract

The invention discloses a treatment method for cleaning and recycling a polytetrafluoroethylene reaction kettle, which combines ethyl acetate washing, organic acid washing, hydrofluoric acid washing and dissolving assisting effects of a dispersing aid, as well as photo-reduction treatment and chemical reagent reduction treatment to remove stubborn dirt in the polytetrafluoroethylene reaction kettle. When the preparation method is used for treating the polytetrafluoroethylene reaction kettle, a good cleaning effect is achieved, so that the reaction kettle is still as white as before, excessive burden of an acid-base environment in the reaction kettle cannot be caused, and the preparation method is suitable for being recycled in chemical experiments.

Description

technical field [0001] The invention relates to the technical field of reactor cleaning, in particular to a treatment method for cleaning and reusing polytetrafluoroethylene reactors. Background technique [0002] Reactor is a reaction vessel that achieves the heating, evaporation, cooling and low-speed mixing functions required by the process through the design of the vessel structure and parameter configuration. It is widely used in petroleum, chemical, rubber, pesticide, dye, pharmaceutical , food and other fields, often used to complete vulcanization, nitration, hydrogenation, alkylation, polymerization, condensation and other processes. In the chemical synthesis reaction experiment, the reaction kettle that is often used is a set of reaction kettle that is composed of a stainless steel outer lining reaction kettle and a polytetrafluoroethylene lining reaction kettle. Attachment, non-toxic, insulation and other advantages, often used as reaction vessels for chemical syn...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B08B9/087B08B9/093B08B9/08B08B3/08B08B3/12B08B13/00
CPCB08B9/087B08B9/093B08B9/08B08B3/08B08B3/12B08B13/00Y02W30/62
Inventor 蔡小冰
Owner 河北中天兰清环境科技有限公司
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