Purification and regeneration method of waste organic alkali

Abstract

The invention discloses a purification and regeneration method of waste organic alkali, the method comprises the following steps: 1) pumping organic alkali waste liquid into a filter element, a filter bag and the like with the precision of 0.1-10 microns, primarily filtering large-particle impurities, and then adding into a circulating storage tank of a purification device; 2) pumping the raw material waste liquid into a high-precision film through a high-pressure pump to remove photoresist impurities so as to obtain a purified organic alkali solution; 3) pumping the purified organic alkali solution into special resin, adsorbing and removing metal impurities in the purified organic alkali solution to obtain a purified solution; and 4) finally, enabling the purified liquid to pass through a membrane with the precision of less than 0.001 nm, and concentrating to obtain the purified regenerated organic alkali. According to the purification and regeneration method of the waste organic alkali, photoresist impurities in the waste organic alkali are removed by adopting a multi-stage high-precision membrane, meanwhile, metal impurities in the waste liquid are removed by adopting two-stage special resin, and finally, the organic alkali is obtained through concentration, so that emission of organic wastewater can be reduced, and recycling of the organic alkali liquor can be realized.

Description

technical field [0001] The invention relates to the field of organic waste alkali treatment, in particular to a method for purifying and regenerating waste organic alkali. Background technique [0002] At present, organic bases (TMAH, MEA, sodium methoxide, potassium ethoxide, etc.) are widely used in the production processes of liquid crystal display thin film transistors and touch screen industries, semiconductor industries or lithium battery industries, etc. After use, waste organic bases are treated as wastewater After discharge, there are the following problems: 1) the organic waste alkali is discharged after being treated as production wastewater. Due to the large amount of waste water, a large amount of organic alkali will be neutralized and disposed of, which is a great waste; 2) the treatment cost of waste water is relatively high ; 3) Waste organic alkalis are usually poisonous and harmful substances, which have great hidden dangers to the environment after dischar...

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Problems solved by technology

[0002] At present, organic bases (TMAH, MEA, sodium methoxide, potassium ethoxide, etc.) are widely used in the production processes of liquid crystal display thin film transistors and touch screen industries, semiconductor industries or lithium battery industries, etc., and the waste organic bases after use are treated as wastewater After discharge, it has the following problems: 1) the organic waste alkali is treated as production wastewater and discharged, because the amount of waste water is large, it will cause a large amount of organic alkali to be neutralized and disposed of, which is a great waste; 2) the treatment cost of waste water is relatively high ; 3) Waste organic alkalis are usually poisonous and harmful substances, which have great hidden dangers to the environment after discharge

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