Method for separating and recovering phosphoric acid from acetic acid-nitric acid-phosphoric acid series mixed acid waste liquor

A technology of waste liquid separation and nitric acid, applied in phosphoric acid, phosphorus oxyacid, extraction water/sewage treatment, etc., can solve the problems of lower separation between oil phase and water phase, poor separation, difficult extraction, etc., to improve the separation performance , the effect of improved stripping and improved extraction selectivity
CN102167415BActive Publication Date: 2015-04-01SANWA YUKA INDS
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
SANWA YUKA INDS
Publication Date
2015-04-01

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Abstract

The invention relates to a method for separating and recovering phosphoric acid from acetic acid-nitric acid-phosphoric acid series mixed acid waste liquor. The method disclosed by the invention is characterized by comprising the following steps of: an acetic acid-nitric acid extracting step: mixing waste liquor containing acetic acid, nitric acid and phosphoric acid with an extracting agent solution of aliphatic series straight-chain saturated hydrocarbon which contains phosphoric trialkyl ester and 6-13 carbon atoms and selectively dissolving and extracting acetic acid and nitric acid from the extracting agent solution; a phosphoric acid recovering step: recovering the phosphoric acid from extracting waste liquor obtained in the extraction step; and an acetic acid-nitric acid stripping step: enabling the extracting agent solution containing the acetic acid and the nitric acid, obtained in the acetic acid-nitric acid extracting step, to be in contact with stripping water so that the acetic acid and the nitric acid are dissolved and transferred to the stripping water. The extracting agent solution is recycled by feeding the oil-phase extracting agent solution obtained in the acetic acid-nitric acid stripping step to the acetic acid-nitric acid extracting step. By means of the invention, the favorable separability of oil phase and aqueous phase in the stripping step can be maintained for a long time, and the phosphoric acid can be selectively and favorably separated and recovered from the acetic acid-nitric acid-phosphoric acid series mixed acid waste liquor for a long time with high efficiency.
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Description

technical field

[0001] The present invention relates to a method for separating and recovering phosphoric acid efficiently and selectively over a long period of time from an acetic acid-nitric acid-phosphoric acid mixed acid waste liquid discharged from, for example, a liquid crystal manufacturing process or a semiconductor manufacturing process, and in particular, to an oil phase generated in a peeling step. The extractant liquid is supplied to the extraction step, and the method of recycling the extractant liquid for a long time. Background technique

[0002] In the liquid crystal manufacturing industry and the semiconductor manufacturing industry, which have been rapidly developed in recent years, various waste waters are generated during the production process, and are discharged by appropriate treatment according to the type, nature, and the like of each waste water. For example, a mixed acid waste liquid in which acetic acid, nitric acid, and phosphoric acid are mixed ...

Claims

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