Method for purifying of waste water
AssigneeLG Chem, Ltd.
InventorsSuk Yung Oh, Yong Heon Cho, Joo Sik Oh, Jun Seok Ko, Kyeong Hyeon Jo, Seung Whan Oh
Life of this patent
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Abstract
A method for purifying of waste water includes: supplying a mixed stream, in which wastewater including water, a nitrile-based monomer, and ammonia and an acid component are mixed, to a first column; condensing an upper discharge stream of the first column, supplying the condensed stream to a decanter to separate the stream into a water layer and an organic layer, and supplying components of the organic layer to a second column; and separating a by-product from a lower discharge stream of the second column, and recovering the nitrile-based monomer from an upper discharge stream of the second column.
Claims8
A method for purifying of waste water comprising:
- supplying a mixed stream including a wastewater and an acid component, added to the wastewater to lower the wastewater pH, to a first column, wherein the wastewater includes water, a nitrile-based monomer, and ammonia;
- condensing an upper discharge stream of the first column to form a condensed stream, supplying the condensed stream to a decanter to separate the condensed stream into a water layer and an organic layer, and supplying components of the organic layer to a second column;
- and
- separating a by-product from a lower discharge stream of the second column, and recovering the nitrile-based monomer from an upper discharge stream of the second column,
- wherein a pH of the mixed stream ranges from 1.5 to 5.0, and
- wherein the acid component includes one or more of acetic acid, nitric acid, sulfuric acid, phosphoric acid, formic acid, or cyanic acid.
Dependencies are inferred from the claim text.