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A kind of resource utilization method of waste LCD screen polarizer

A polarizer and resource-based technology, applied in chemical instruments and methods, organic chemistry, liquid carbon-containing fuels, etc., can solve problems such as residual residues, complex processes, low acetic acid or lactic acid yields, etc., to solve environmental problems, The effect of improving economic efficiency

Active Publication Date: 2018-04-10
RENMIN BAIYE TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, on the one hand, the yield of acetic acid or lactic acid prepared by this method is low, and the degradation of the polarizer is incomplete, leaving residues; on the other hand, the process is complicated, and it is currently limited to the laboratory research stage and has not been widely used.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] 100 g of broken and cleaned polarizers were put into a reactor, and water vapor heated to 100° C. was passed through, and the temperature of the reactor was heated to 100° C., and reacted for 50 hours. The reaction was stopped, and the solid remaining in the reactor was dried and weighed, weighing 85.4g, and the decomposition rate was 14.6%. Undecomposed polarizers can participate in the cracking process of the next batch. The formed decomposition mixture is cooled down by a cooling device, separated and purified to obtain acetic acid, ethanol, glucose and fuel oil.

Embodiment 2

[0019] Put 100 g of broken and cleaned polarizers into the reactor, pass through ethanol vapor heated to 200°C, heat the reactor to 200°C, and react for 20 hours. The reaction was stopped, and the remaining solid in the reactor was dried and weighed, weighing 34.7g, and the decomposition rate was 65.3%. Undecomposed polarizers can participate in the cracking process of the next batch. The formed decomposition mixture is cooled down by a cooling device, separated and purified to obtain acetic acid, ethanol, glucose and fuel oil.

Embodiment 3

[0021] 100 g of broken and cleaned polarizers were put into a reactor, and propylene glycol vapor heated to 500° C. was introduced into the reactor, and the temperature of the reactor was heated to 800° C., and reacted for 1 hour. The reaction was stopped, and the remaining solid in the reactor was dried and weighed, weighing 9.8g, and the decomposition rate was 90.2%. Undecomposed polarizers can participate in the cracking process of the next batch. The formed decomposition mixture is cooled down by a cooling device, separated and purified to obtain acetic acid, ethanol, glucose and fuel oil.

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PUM

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Abstract

The invention relates to a resource utilization method of a waste liquid crystal screen polarizer, comprising the steps of: crushing the polarizer, washing it, and drying it for use; placing the broken polarizer in a reactor, and passing through Enter high-temperature steam, react, and the formed decomposition mixture is cooled down by the cooling device; the cooled liquid is collected, and separated and purified into acetic acid, ethanol, glucose and oil phase by separation and purification technology. The beneficial effects of the present invention are: (1) after the cracked product is separated and purified, the obtained acetic acid, ethanol, and glucose can be reused for basic chemical products; (2) if the cracked product is all oil phase, or the oil phase obtained by separation Part of it can be directly used as fuel oil; (3) The direct application of the oil phase part avoids the cost required for further purification and significantly improves economic benefits; (4) It not only solves environmental problems, but also has certain economic benefits.

Description

technical field [0001] The invention relates to a method for resource utilization of waste liquid crystal screen polarizers. Background technique [0002] The rapid development of liquid crystal display, plasma display, and electroluminescent display industry has prompted a sharp increase in the global output of liquid crystal screens every year. The discarded LCD screens generated during the production of LCD screens and a large number of scrapped LCD monitors that have ended their functions have gradually become the main source of electronic waste. Most of these discarded LCD screens have become pollutants flooding urban garbage dumps because they have not been effectively recycled and utilized, which not only damages the environment but also wastes resources. Polarizer is an important functional film material in LCD screen, mainly composed of cellulose triacetate and polyvinyl alcohol grafted with iodine. This film is pasted on the glass substrates at the front and back...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07H3/02C07H1/00C07C31/08C07C29/00C07C53/08C07C51/00C10L1/02
Inventor 唐惠东李龙珠杨蓉陈玉伟徐立波
Owner RENMIN BAIYE TECH CO LTD