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Method for treating pva polymer material by supercritical water oxidation

A technology of polymeric materials and treatment methods, applied in radioactive purification, nuclear engineering, etc., can solve problems such as environmental pollution and inapplicable radioactive waste

Active Publication Date: 2019-01-11
青岛天和清原科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Generally speaking, incineration is the most effective technology for dealing with combustible waste, but due to reasons such as site and transportation, this technology is not suitable for the final disposal of radioactive waste, and the discharge of volatile radioactive waste into the environment will cause long-term damage. environmental pollution

Method used

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  • Method for treating pva polymer material by supercritical water oxidation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Collect work clothes of nuclear power plants, wash these work clothes to remove attached nuclides.

[0032] Step 1. Preliminary treatment of the cleaned work clothes, that is, cutting or processing it into small pieces of 1cm×1cm by other methods, weighing 80g, and placing it in a dissolution tank, adding 920mL of distilled water to the dissolution tank, Heat the dissolving tank, and make the temperature of the distilled water in it be 100°C, observe the PVA polymer material in the dissolving tank, and stop if you see that all the dissolving tank has turned into a white viscous liquid through stirring;

[0033] Step 2, filter out the particles in the PVA solution, add acid to the viscous liquid in step 1 to adjust the pH, preferably add citric acid with a mass fraction of 10%, and the volume ratio of the viscous liquid to citric acid is 100:1 , stirring to adjust the pH to about 3.8;

[0034] Step 3, then adding a mass fraction of 1% ferrous sulfate solution, the volum...

Embodiment 2

[0040] The difference from Example 1 is that citric acid is added in step 2 to control the pH at 4.3.

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Abstract

The invention discloses a method for treating PVA polymeric material by supercritical water oxidation, firstly, placing a pre-treated PVA polymeric material into a dissolving tank, feeding distilled water into the dissolving tank, and heating to boil the distilled water, thus forming PVA solution; filtering primarily to filter particulate matters from the PVA solution; adding sodium citrate solution into the filtered PVA solution, controlling pH (potential of hydrogen) to 3.8-4.3, adding ferrous sulfate solution with the mass fraction of 1%, and stirring and mixing uniformly to obtain reaction solution I; placing the reaction solution I into a supercritical reaction kettle, carrying out supercritical oxidation, controlling reaction temperature to be not less than 400 DEG C and reaction pressure to be not less than 22 MPa, to obtain products of carbon dioxide and water after supercritical process; exhausting carbon dioxide directly by a pipe and reflowing water to the periphery of the dissolving tank for heating the dissolving tank. The removing rate of the method to organic matter can reach 99.99% and higher, and has no environment pollution.

Description

technical field [0001] The invention relates to the technical field of processing PVA polymer materials, in particular to a method for supercritical water oxidation treatment of PVA polymer materials. Background technique [0002] Due to the saturation of storage space for radioactive waste in nuclear power plants and the considerable cost of waste disposal, the development of technologies to reduce the amount of waste generated by nuclear power plants has attracted more and more attention, and it is necessary to seek a new technology to fundamentally reduce Percentage of radioactive solid waste in combustible waste. [0003] According to the current survey reports of relevant parties, in nuclear power plants in the United States and Mexico, more than 85% of the factories are committed to reducing the various levels of pollution in the washing room by using various water-soluble protective products made of PVA, such as work clothes, purification paper, overshoes, etc. The t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G21F9/30
CPCG21F9/30
Inventor 赵师普李田宇
Owner 青岛天和清原科技有限公司