Method for treating polarizing plate manufacturing waste liquid

A processing method and polarizing plate technology, applied in the field of potassium iodide recovery, can solve problems such as insufficient quality

Pending Publication Date: 2021-09-28
NITTO DENKO CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, boron-containing compounds in such recovered KI are not sufficiently reduced, and there is a problem that the quality is not sufficient for recycling.

Method used

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  • Method for treating polarizing plate manufacturing waste liquid
  • Method for treating polarizing plate manufacturing waste liquid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042]Actual manufacturing the polarizing plate polarizing plate manufacturing waste generated sequentially supplied to the first concentration step, a cooling crystallization step, the first solid-liquid separation step, a second concentration step, the second solid-liquid separation step, the aqueous solution preparation step, the third step is concentrated and a third solid-liquid separation step, a waste liquid recovery polarizing plate manufactured in KI.

[0043] The first step was concentrated by means of the heat pump type configuration concentrated to the front portion (upstream), concentrated and flash-type apparatus disposed in the subsequent stage (downstream) is performed. In a first concentration step, while maintaining the temperature at 70 deg.] C while the waste is concentrated by evaporation producing the polarizing plate. By cooling crystallization step the temperature was cooled from 70 deg.] C to 25 deg.] C is performed. Generating a first precipitate by cooli...

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Abstract

Provided is a method for treating a polarizing plate manufacturing waste liquid, the method being capable of recovering potassium iodide having sufficient quality for reuse. The method for treating the polarizing plate manufacturing waste liquid is a method for recovering potassium iodide from the polarizing plate manufacturing waste liquid. The method comprises the following steps: a first concentration step of evaporating and concentrating the polarizing plate manufacturing waste liquid to generate a first precipitate mainly containing a boron-containing compound and polyvinyl alcohol; a first solid-liquid separation step of performing solid-liquid separation on the first precipitate to generate a first filtrate; a second concentration step of evaporating and concentrating the first filtrate to produce a second precipitate mainly containing potassium iodide; a second solid-liquid separation step of performing solid-liquid separation on the second precipitate to produce a second filtrate; a filtrate discharge step of discharging at least a portion of the second filtrate to the outside of the system; and a recovery step of recovering potassium iodide from the separated second precipitate.

Description

Technical field [0001] The present invention relates to a method of treatment of a polarizing plate manufacturing waste liquid. In more detail, the present invention relates to a treatment method for producing a waste liquid from a polarizing plate for recovering potassium iodide in a waste liquid produced in the production of a polarizing plate. Background technique [0002] In the manufacture of the polarizing plate, iodine, potassium iodide (Ki), potassium iodide (Ki), boronic acid (e.g., boric acid) in the dyeing, crosslinking and tensile step, etc. Therefore, the waste liquid generated in the production of the polarizing plate (hereinafter referred to as a polarizing plate manufacturing waste liquid) contains a certain amount of such a compound. In recent years, from environmental issues, sustainable development and other views, the recovery of Tuzui was studied from the polarizing plate manufacturing waste, and the recovered Ki was reused. However, boron-containing compound...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/10C01D3/12C02F1/04C02F1/58
CPCC02F9/00C01D3/12C02F1/04C02F1/58C02F1/06C02F1/043C02F1/22C02F1/38B01D25/12
Inventor 若山峻哉木谷义明加藤秀史平野悟藤原义浩水野智章
Owner NITTO DENKO CORP
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