Method and device for recovering liquid crystal in waste panel

A technology for panels and liquid crystals, which is applied in the field of recycling liquid crystals in discarded panels, can solve the problems of changing liquid crystal formulations, complicated processing steps, and inability to apply directly, and achieves the effect of reducing complexity and simplifying purification steps.

Active Publication Date: 2010-06-09
IND TECH RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This method does not mention the method of purifying and recovering liquid crystals, so the recovered liquid crystal materials will contain a large amount of packaging materials and cannot be directly applied
[0009] So

Method used

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  • Method and device for recovering liquid crystal in waste panel
  • Method and device for recovering liquid crystal in waste panel
  • Method and device for recovering liquid crystal in waste panel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] Get 21 pieces of discarded panels at 15 o'clock in a certain factory. The liquid crystal used in it is twisted nematic (TN-Q1 for short). After fragmentation, acetone is used as the extraction solvent. figure 1 ) and device recovery liquid crystal (please refer to figure 2 ). It should be noted that the recovery device in Example 1 does not contain a temperature control device and a filter adsorption device 15 . First, a 1000 mL broken panel is placed in the 2000 mL extraction tank 21 . Then take 3000mL of acetone as the extraction solvent and put it into the storage tank 12, then open the switch valve 42 to let the solvent flow into the extraction tank 11, and soak the broken panel for 30 minutes to form an extraction liquid. Then the extract is filtered through the filter plate 22 and then flows to the collection tank 13, and the collection tank 13 is heated with a water bath at 90° C. to make the acetone in the extract form vapor. The acetone vapor is condensed b...

Embodiment 2

[0053] Similar to Example 1, the difference is that the extraction solvent is changed from acetone to n-hexane, the temperature of the water bath in the collection tank 13 is 85°C, and a temperature control device is installed in the extraction tank 11, between the collection tank 13 and the extraction tank 11 Set up filter adsorption device 15. Its GCMS spectrum is as Figure 6 shown. Depend on Figure 6 and image 3 It can be seen from the comparison that the composition of the recovered liquid crystal in Example 2 is very similar to that of the original liquid crystal.

Embodiment 3

[0055] Get 76 discarded panels at 32 o'clock in a certain factory. The liquid crystal used in it is a vertical alignment type (VA-C1 for short). After fragmentation, normal hexane is used as an extraction solvent. figure 1 shown) and devices (such as figure 2 Shown) to recover liquid crystals, first place a 20L broken panel in a 30L extraction tank. Then take 40L of n-hexane as the extraction solvent and add it to the storage tank, then make the extraction solvent flow into the extraction tank, and soak the broken panel for 30 minutes to form an extraction liquid. Then the extract is temperature-controlled, filtered and adsorbed, and the extract flows to the collection tank, and the collection tank is heated with a 90°C water bath to make the n-hexane in the extract form vapor. Use the condensing device to condense the n-hexane vapor to form liquid droplets and flow into the storage tank. After the extract in the extraction tank completely flows into the collection tank, let...

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Abstract

The invention provides a method for recovering liquid crystal in a waste panel, comprising the following steps: (i) smashing the waste panel, soaking the smashed waste panel with solvent to dissolve the liquid crystal in the smashed waste panel and a package material to form extract liquid; (ii) cooling the extract liquid to lower the solubility of the package material, thus the package material is easily removed by filtering and adsorbing; (iii) heating the extract liquid to lead the solvent to form vapor and condensing to form recovered solvent; (iv) soaking the smashed waste panel with the recovered solvent to form the extract liquid; and (v) repeating steps (ii) to (iv) until the liquid crystal in the panel is dissolved in the extract liquid, and removing the solvent to obtain the recovered liquid crystal. The invention also provides a recovery device to carry out the above steps; the recovered liquid crystal contains extremely less solvent, the ratio of contained impurity is extremely low and the recovery efficiency reaches over 95%.

Description

technical field [0001] The invention relates to a method and device for recovering liquid crystals in waste panels, and more particularly relates to a recycling extraction method therein. Background technique [0002] Liquid crystal displays have the advantages of thinness, light weight, low power consumption, no radiation pollution, and compatibility with semiconductor manufacturing processes. Their use, production, and waste have all increased significantly. Although it is still uncertain whether liquid crystals are harmful, incinerating or burying waste panels without removing liquid crystals may cause environmental pollution. Although the amount of liquid crystals only accounts for about 0.1-0.2% of the total weight of the panel, the panel glass cannot be recycled due to regulations. Currently Taiwan is one of the largest LCD producers in the world, and the Waste Electrical and Electronic Equipment (WEEE) Directive announced by the European Union in 2003 has required ma...

Claims

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Application Information

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IPC IPC(8): B09B3/00
Inventor 洪焕毅吕健玮廖婉君蔡正国戴贤辉卢正权郑功龙陈哲阳
Owner IND TECH RES INST
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