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A resource utilization method and system for pva waste adhesives

A binder and recycling technology, applied in chemical instruments and methods, neutralized water/sewage treatment, water/sewage multi-stage treatment, etc., can solve the problem of ignoring the resource utilization of PVA waste binders, poor treatment effect, Deal with low efficiency and other issues to achieve the effect of resource utilization, load reduction and COD reduction

Active Publication Date: 2021-06-01
深圳星河环境股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the pretreatment method in the prior art has a poor treatment effect on high-concentration PVA waste binders or jelly-like PVA waste binders, and the treatment efficiency is low. At the same time, the recycling of PVA waste binders is ignored. use

Method used

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  • A resource utilization method and system for pva waste adhesives
  • A resource utilization method and system for pva waste adhesives

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] Embodiment 1: The PVA waste binder is a high-concentration fluid state PVA waste binder.

[0051] Add 300L of high-concentration fluid PVA waste binder into the 1m3 reactor through the raw water tank, start the stirring paddle for continuous stirring, and adjust the system temperature in the reactor to 45-50°C. After adjusting the temperature, slowly introduce 23.5L of n-butyraldehyde into the reaction kettle through the first chemical tank, keep the stirring paddle continuously stirring, and adjust the system temperature in the reaction kettle to 8-10°C. Slowly add 20% hydrochloric acid into the reaction kettle through the second chemical tank, adjust the pH of the reaction kettle system to ≈2, gradually increase the system temperature in the reaction kettle to 55°C, stop heating after holding for half an hour, and continue stirring with the stirring blade Until the system was cooled to room temperature, the solid and liquid separated. Two batches of continuous produc...

Embodiment 2

[0056] Embodiment 2: The PVA waste binder is a high-concentration jelly-like PVA waste binder.

[0057] Add 500kg of high-concentration jelly-like PVA waste adhesives into the 1m3 reactor through the raw water tank, start the stirring paddle for continuous stirring, and adjust the system temperature in the reactor to 45-50°C. After adjusting the temperature, slowly introduce 38L of n-butyraldehyde into the reaction kettle through the first chemical tank, keep the stirring paddle continuously stirring, and adjust the system temperature in the reaction kettle to 8-10°C. Slowly add 20% hydrochloric acid into the reaction kettle through the second chemical tank, adjust the pH of the reaction kettle system to ≈2, gradually increase the system temperature in the reaction kettle to 55°C, stop heating after holding for half an hour, and continue stirring with the stirring blade Until the system was cooled to room temperature, the solid and liquid separated. Two batches of continuous ...

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Abstract

The invention discloses a resource utilization method and system for PVA waste adhesives. The method comprises: stirring the PVA waste adhesives and adjusting the temperature to 45-50°C; adding a certain amount of acetal agent, and continuously stirring, Fully mix the acetal agent with the waste PVA binder, and adjust the temperature to 8-10°C; add a certain amount of acid regulator, adjust the pH to 1-4, and adjust the temperature to 50-55°C; continue Stirring and cooling naturally to obtain a solid-liquid mixture; performing solid-liquid separation on the solid-liquid mixture, and successively crushing, drying, and secondary crushing of the solid after solid-liquid separation. The technical scheme of the invention improves the treatment effect and efficiency of high-concentration PVA waste adhesives and jelly-like PVA waste adhesives, and realizes resource utilization of PVA waste adhesives.

Description

technical field [0001] The invention relates to the field of industrial wastewater treatment, in particular to a resource utilization method and system for waste PVA adhesives. Background technique [0002] In the stretching production process of polarizers for thin film transistor displays (TFT-LCD), a large amount of waste adhesive glue will be produced. The main components of this type of adhesive are: about 90% water, 9-10% poly Vinyl Alcohol (PVA), which will coagulate into jelly after standing for a long time. Therefore, waste producing units usually store such waste adhesives in two types: jelly state and fluid state. The main characteristics of the waste adhesive are high viscosity, COD content greater than 50000mg / L, extremely poor biodegradability, and weak acidity. This kind of waste glue is a typical refractory waste, which will cause great harm to the environment. In the research on the treatment methods of PVA waste adhesives, it can be roughly divided into ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F8/28C08F116/06C02F9/04C02F103/34
CPCC02F1/00C02F1/001C02F1/66C02F9/00C02F2103/34C08F8/28C08F116/06
Inventor 田浩杨林城国吴玉章叶自洁邹毅芳黄德贤陆严宏
Owner 深圳星河环境股份有限公司
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