Method for producing acid by hydrothermally degrading waste liquid crystal display polaroids

A liquid crystal display, hydrothermal degradation technology, applied in chemical instruments and methods, preparation of carboxylate, preparation of organic compounds, etc., to achieve the effect of high speed, high efficiency and small size of equipment

Inactive Publication Date: 2014-04-02
TONGJI UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] In the prior art, there are examples of hydrothermal technology to decompose agricultural waste and detect acetic acid and lactic acid in the liquid phase products, but there is currently no background technology for hydrothermal acid production using waste liquid crystal display polarizers

Method used

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  • Method for producing acid by hydrothermally degrading waste liquid crystal display polaroids

Examples

Experimental program
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Effect test

Embodiment 1

[0030] Example 1: Degradation of waste liquid crystal display polarizers to produce acetic acid

[0031] (1) Use the polarizer contained in the waste liquid crystal display as the material, cut it into small pieces, and then put it into a crusher for crushing, so that the particle size of the crushed material is less than 2mm.

[0032] (2) The broken material of the polarizer obtained in step (1) is used as a reactant, deionized water is used as a solvent, hydrogen peroxide is used as an oxidant, and the mass ratio of the polarizer to water is between 0.01-0.05, and placed in a high temperature and high pressure resistant, In the corrosion-resistant reactor, the volume of water added is 50-80% of the reactor volume.

[0033] (3) Place the reactor containing the mixture of polarizer and water in step (2) in a temperature-controlled salt bath furnace, control the reaction temperature at 250°C, 275°C, 300°C, 325°C, 350°C, and heat React for 5 minutes; heat at 350°C for 1 minut...

Embodiment 2

[0036] Example 2: Degradation of waste liquid crystal display polarizers to produce lactic acid

[0037] (1) Use the polarizer contained in the waste liquid crystal display as the material, cut it into small pieces, and then put it into a hammer crusher to crush it, so that the particle size of the crushed material is less than 2mm.

[0038] (2) The broken material of the polarizer obtained in step (1) is used as a reactant, deionized water is used as a solvent, hydrogen peroxide is used as an oxidant, and the mass ratio of the polarizer to water is between 0.01-0.05, and placed in a high temperature and high pressure resistant, In the corrosion-resistant reactor, the volume of water is 50-80% of the reactor volume.

[0039] (3) Place the reactor containing the mixture of polarizer and water in step (2) in a temperature-controlled salt bath furnace, control the reaction temperature at 250°C, 275°C, 300°C, 325°C, 350°C, and heat React for 5 minutes; heat at 350°C for 1 minut...

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Abstract

The invention provides a method for producing acid by hydrothermally degrading waste liquid crystal display polaroids, which comprises the following steps: crushing waste liquid crystal display polaroids; mixing the waste polaroids with water, and putting the mixture in a reactor, wherein the mass ratio of the waste polaroids to the solvent water is 0.01:1-0.05:1, and the addition amount of the solvent water is 50-80% of the reactor by volume; putting the reactor in a salt-bath furnace, keeping the temperature of the salt-bath furnace at 250-400 DEG C and the pressure at 4.0-25.0Mpa for 1-15 minutes under subcritical reaction conditions of water, taking out the reactor, and cooling to room temperature within 20-40 seconds; and filtering the product, and obtaining the product containing acetic acid or lactic acid from the liquid phase. The hydrothermal degradation of the waste liquid crystal display polaroids can implement unification of destroying, hydrolysis and resource recycling; and the hydrothermal degradation process has the advantages of high speed, small equipment size, wide treatment range, high efficiency, no secondary pollution and the like. The waste liquid crystal display polaroids are subjected to hydrothermal recycling, thereby implementing production of acetic acid and lactic acid by hydrothermally degrading the waste liquid crystal display polaroids.

Description

technical field [0001] The invention belongs to the technical field of environmental protection, and in particular relates to a method for hydrothermally degrading a waste liquid crystal display polarizer to produce acid, which is suitable for resource recovery and reuse of waste liquid crystal display polarizers. Background technique [0002] With the widespread application of LCDs, a large number of scrapped LCDs have gradually become an important part of electronic waste. The resulting ecological and environmental problems and the recycling of waste liquid crystal displays have aroused widespread concern. Polarizer is an important functional film material in liquid crystal display. It is mainly composed of cellulose triacetate and polyvinyl alcohol grafted with iodine. These materials can be recycled and reused after effective treatment. However, the current treatment method is mainly in the form of incineration, which not only easily produces certain environmental pollu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C53/08C07C59/08C07C51/00C07C51/285B01J3/04
Inventor 李光明庄绪宁叶颖莹贺文智黄菊文
Owner TONGJI UNIV
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