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Method for efficiently degrading polyvinyl alcohol material

A polyvinyl alcohol, high-efficiency technology, applied in chemical instruments and methods, water/sludge/sewage treatment, water pollutants, etc., can solve the problems of PVA degradation and low PVA concentration, so that it is not easy to secondary pollution, oxidant The effect of small amount and high efficiency degradation

Inactive Publication Date: 2017-07-21
JIANGNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] In recent years, advanced oxidative degradation technology has attracted widespread attention in the treatment of refractory toxic organic pollutants. At present, the research on the degradation of PVA is mainly aimed at the research of PVA-containing wastewater, and the concentration of PVA in wastewater is mostly in the range of 1 to 30g / L. , the PVA concentration at this time is small, and there is no way to degrade PVA with a concentration above 50g / L. There are few reports on relevant research

Method used

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  • Method for efficiently degrading polyvinyl alcohol material
  • Method for efficiently degrading polyvinyl alcohol material
  • Method for efficiently degrading polyvinyl alcohol material

Examples

Experimental program
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Effect test

Embodiment 1

[0042] The step of carrying out degradation treatment by the present invention is as follows:

[0043] 1. Pretreatment of PVA material (1799 yarn): at room temperature, weigh 5g of PVA material, add deionized water, swell for 2 hours, then heat up to 60°C and keep stirring to dissolve. After the dissolution is complete, dissolve it with water The solution was adjusted to 100ml.

[0044] 2. Add 100ml of pretreated PVA solution into the reaction kettle, adjust the pH of the solution to 4 with hydrochloric acid, and slowly add 60ml of hydrogen peroxide with a mass concentration of 30% and a ferrous nitrate solution with a mass concentration of 30% while rotating and stirring. 40ml, the addition rate of hydrogen peroxide and ferrous nitrate solution is 15ml / h and 10ml / h respectively, the molar ratio of hydrogen peroxide and ferrous nitrate is 8.81:1, and it is oxidatively degraded at 60°C for 1 hour.

[0045]3. Add 20ml of sodium hydroxide solution with a mass concentration of 20...

Embodiment 2

[0049] The step of carrying out degradation treatment by the present invention is as follows:

[0050] 1. Pretreatment of PVA material (1799 yarn): at room temperature, weigh 15g of PVA material, add deionized water, swell for 2 hours, then heat up to 90°C and stir to dissolve. After the dissolution is complete, dissolve the solution Dilute to 100ml.

[0051] 2. Add 100ml of pretreated PVA solution into the reaction kettle, adjust the pH of the solution to 3 with sulfuric acid, and slowly add 120ml of hydrogen peroxide with a mass concentration of 15% and ferrous chloride with a mass concentration of 25% while rotating and stirring. Solution 40ml, oxidant and catalyst adding rate are 30ml / h and 10ml / h respectively, the molar ratio of hydrogen peroxide and ferrous nitrate is 7.50:1, at 80 ℃, oxidative degradation is 2 hours.

[0052] 3. Add 30ml of sodium hydroxide solution with a mass concentration of 20% to the solution after oxidative degradation, and adjust the pH of the s...

Embodiment 3

[0055] The step of carrying out degradation treatment by the present invention is as follows:

[0056] 1. Pretreatment of PVA material (1799 yarn): at room temperature, weigh 8g of PVA material, add deionized water, swell for 2 hours, then heat up to 80°C and stir to dissolve. After the dissolution is complete, dissolve the solution Dilute to 100ml.

[0057] 2. Add 100ml of the pretreated PVA solution into the reaction kettle, adjust the pH of the solution to 5 with nitric acid, and slowly add 60ml of hydrogen peroxide with a mass fraction of 30% and a ferrous bromide solution with a mass fraction of 15% while rotating and stirring. 80ml, the addition rate of oxidizing agent and catalyst is 20ml / h and 10ml / h respectively, the molar ratio of hydrogen peroxide and ferrous nitrate is 10:1, at 50 ℃, oxidative degradation is 1 hour.

[0058] 3. Add 20ml of sodium hydroxide solution with a mass concentration of 20% to the solution after oxidative degradation, and adjust the pH of t...

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Abstract

The invention discloses a method for efficiently degrading a polyvinyl alcohol material. The method specifically comprises the following steps: swelling PVA at normal temperature, heating and dissolving the PVA, and adjusting the pH of a dissolving solution to 3 to 5; under a condition of constant temperature of 40 to 90 DEG C, adding an oxidant and a catalyst drop by drop while stirring, and performing reaction for 1 to 5 hours; adding a sodium hydroxide solution into the degraded solution to adjust the pH of the solution to be 9 to 13, performing sedimentation and filtration, and recycling iron sludge. The method is easy to operate; the oxidant and the catalyst both are conventional medicines, wide in source and low in cost; by the improvement on the adding mode and the ratios of the oxidant and the catalyst, degradation of the polyvinyl alcohol material which is a waste solid is realized; the PVA is degraded into a small-molecular-weight organic matter which has the molecular weight less than or equal to 500 g / mol and is easy to degrade; the organic matter at the molecular weight level is easily subjected to further biological degradation, thermal cracking and the like and is easy to treat; and no secondary pollution is caused.

Description

technical field [0001] The invention belongs to the technical field of processing high molecular weight polymer materials, in particular to a method for efficiently degrading polyvinyl alcohol materials. Background technique [0002] Polyvinyl alcohol (PVA) is an important chemical synthetic material with good water solubility and chemical resistance, and is widely used in printing and packaging, chemical fiber, clothing and other fields. However, its poor biodegradability greatly increases the difficulty of processing PVA waste materials. The recycling of discarded PVA chemical fiber products and clothing is also a thorny problem. At present, the processing of PVA waste materials is mainly divided into two parts, one part is recycled, processed and reused, but the recycling cost caused by this method is relatively high. Most enterprises unwilling to proceed. The other part is to carry out "put into the ground for safety" type of landfill, resulting in a lot of waste of sp...

Claims

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Application Information

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IPC IPC(8): C02F9/10C02F101/34
CPCC02F1/001C02F1/02C02F1/66C02F1/722C02F1/725C02F9/00C02F2101/34
Inventor 高强葛明桥王阳毅
Owner JIANGNAN UNIV
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