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Device and method for recovering acetic acid from waste liquid crystal panels by sub/supercritical water method

A liquid crystal panel, supercritical technology, applied in the removal of solid waste, bulk chemical production, separation/purification of carboxylic acid compounds, etc., can solve the problems of unsuitable large-scale treatment, long treatment time, secondary pollution, etc., to achieve Effect of reduction of secondary decomposition and by-products, short reaction time, and no harmful gas emission

Inactive Publication Date: 2018-01-23
SHANGHAI JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method is simple and easy to operate, but a large amount of organic solvents are used in the process, which is easy to cause secondary pollution
At the same time, the processing time is long, the efficiency is low, and it is not suitable for large-scale processing. At the same time, the separated organic matter still needs further processing.

Method used

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  • Device and method for recovering acetic acid from waste liquid crystal panels by sub/supercritical water method
  • Device and method for recovering acetic acid from waste liquid crystal panels by sub/supercritical water method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] First, a Lenovo notebook was disassembled to obtain an LCD panel, which was crushed for 2 minutes with a shear crusher. Take 13g of the broken liquid crystal panel and place it in a sub / supercritical reaction device, and seal the system. Turn on the circulating water and the advection pump, and press the water into the reactor. At the same time, turn on the heater and set the temperature to 400°C. As the pressure rises, adjust the back pressure valve and set the pressure to 23MPa. After the temperature and pressure reach the set value, keep it for 5 minutes. Open the pressure reducing valve, release the pressure, and collect gas and liquid products. When the temperature dropped to room temperature, open the reaction kettle and take out the glass and residue. The yield of acetic acid obtained was 78.23%, and the removal rate of organic matter was 99.77%.

Embodiment 2

[0050] Firstly, a liquid crystal television display is disassembled to obtain a liquid crystal panel, which is broken for 5 minutes by using a shear crusher. Take 500g of the broken liquid crystal panel and place it in a sub / supercritical reaction device, and seal the system. Turn on the circulating water and the advection pump, and press the water into the reactor. At the same time, turn on the heater and set the temperature to 400°C. When the pressure rises to 23MPa, adjust the back pressure valve to maintain the control pressure at 23MPa. After the temperature and pressure reach the set value, keep it for 20min. Slowly open the pressure reducing valve to relieve the pressure and collect gas and liquid products. When the temperature dropped to room temperature, open the reaction kettle and take out the glass and residue. The yield of acetic acid obtained was 75.35%, and the removal rate of organic matter was 99.27%.

Embodiment 3

[0052] First, several mobile phones are disassembled to obtain LCD panels. No need to break, take 2kg liquid crystal panel and send it into the sub / supercritical small test device, and seal the system. Turn on the circulating water and set the water temperature to 15°C. Turn on the advection pump, press water into the reactor, and set the reaction pressure to 25MPa. At the same time, turn on the heater and set the temperature to 450°C. After the temperature and pressure reach the set value, keep it for 1h. Slowly unscrew the pressure relief valve, relieve the pressure, and collect the liquid and gaseous products. When the temperature dropped to room temperature, open the reaction kettle and take out the glass and residue. The yield of acetic acid obtained was 71.86%, and the removal rate of organic matter was 98.89%.

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Abstract

The invention relates to a device for recovering acetic acid from a waste liquid crystal panel through a subcritical / supercritical water method. The device comprises a water tank, a constant-flux pump, a reaction kettle, a first condenser, a counterbalance valve, a reducing valve, a second condenser, a liquid collector, a gas collector, a circulating water tank and a circulating water pump. The invention relates to a method for recovering the acetic acid from a waste liquid crystal panel in a subcritical / supercritical water method. The method comprises the following steps: placing the broken waste liquid crystal panel in a subcritical / supercritical reaction device, enabling the pressure in a reaction system to reach 10 to 30 MPa, and opening a temperature control unit to control the reaction temperature at 200 to 500 DEG C, wherein the reaction time is 1 to 60 minutes. Under the condition of no additional catalyst, the conversion rate of organic matters in the waste liquid crystal panel can reach 99.77 percent, the yield of acetic acid can reach 78.23 percent, in the entire reaction process, the subcritical / supercritical water can be used as a reactant, an environment-friendly reaction solvent and a high-efficiency acid-alkali catalyst of the hydrolysis reaction, and the environmental pollution caused by the use of a great amount of organic solvent and acid-alkali catalyst can be avoided.

Description

technical field [0001] The invention relates to the technical field of harmless and resourceful treatment of organic matter in waste liquid crystal panels, in particular to a device and method for recovering acetic acid from waste liquid crystal panels using sub / supercritical water methods. Background technique [0002] With the rapid development of electronic information technology, the human-computer interaction equipment of electronic products is also constantly improving. Especially the display, which is an important part of electronic products, has always been the research focus of electronic information technology because it is the main window for electronic products to output information to users. Since the LCD panel was first applied to LCD calculator screens by Sharp in 1973, it has been rapidly applied to display terminals of various electronic and electrical equipment, such as mobile phones, notebook computers, GPS navigators, computer monitors, and TV monitors. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B09B3/00B09B5/00C07C53/08C07C51/42
CPCY02P20/54
Inventor 许振明王瑞雪
Owner SHANGHAI JIAOTONG UNIV