US 12,492,133 B2
Method for purifying of waste water
Suk Yung Oh, Daejeon (KR); Yong Heon Cho, Daejeon (KR); Joo Sik Oh, Daejeon (KR); Jun Seok Ko, Daejeon (KR); Kyeong Hyeon Jo, Daejeon (KR); and Seung Whan Oh, Daejeon (KR)
Assigned to LG Chem, Ltd., Seoul (KR)
Appl. No. 18/027,207
Filed by LG Chem, Ltd., Seoul (KR)
PCT Filed Jul. 25, 2022, PCT No. PCT/KR2022/010918
§ 371(c)(1), (2) Date Mar. 20, 2023,
PCT Pub. No. WO2023/090581, PCT Pub. Date May 25, 2023.
Claims priority of application No. 10-2021-0158835 (KR), filed on Nov. 17, 2021; and application No. 10-2022-0081416 (KR), filed on Jul. 1, 2022.
Prior Publication US 2024/0360006 A1, Oct. 31, 2024
Int. Cl. C02F 1/04 (2023.01); B01D 3/14 (2006.01); B01D 5/00 (2006.01); C02F 1/40 (2023.01); C07C 253/34 (2006.01); C02F 101/16 (2006.01); C02F 101/38 (2006.01); C02F 103/38 (2006.01)
CPC C02F 1/048 (2013.01) [B01D 3/14 (2013.01); B01D 5/00 (2013.01); C02F 1/40 (2013.01); C07C 253/34 (2013.01); C02F 2101/16 (2013.01); C02F 2101/38 (2013.01); C02F 2103/38 (2013.01); C02F 2209/02 (2013.01); C02F 2209/03 (2013.01)] 8 Claims
OG exemplary drawing
 
1. 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.