US 12,215,042 B2
Wastewater purification method
Suk Yung Oh, Daejeon (KR); Yong Heon Cho, Daejeon (KR); Jung Su Han, Daejeon (KR); Jun Seok Ko, Daejeon (KR); Nam Young Yoon, Daejeon (KR); and Sung Hwan Kim, Deajeon (KR)
Assigned to LG Chem, Ltd., Seoul (KR)
Appl. No. 18/017,794
Filed by LG Chem, Ltd., Seoul (KR)
PCT Filed Jul. 1, 2022, PCT No. PCT/KR2022/009529
§ 371(c)(1), (2) Date Jan. 24, 2023,
PCT Pub. No. WO2023/090563, PCT Pub. Date May 25, 2023.
Claims priority of application No. 10-2021-0158785 (KR), filed on Nov. 17, 2021.
Prior Publication US 2024/0246837 A1, Jul. 25, 2024
Int. Cl. C02F 1/04 (2023.01); C02F 1/66 (2023.01); C02F 101/16 (2006.01)
CPC C02F 1/048 (2013.01) [C02F 1/043 (2013.01); C02F 1/66 (2013.01); C02F 2101/16 (2013.01)] 10 Claims
OG exemplary drawing
 
1. A wastewater purification method comprising:
supplying a first mixed stream, in which an acid component and wastewater including water, a nitrile-based monomer, and ammonia are mixed, to a first column;
recovering the nitrile-based monomer from an upper discharge stream from the first column;
supplying a second mixed stream, in which a lower discharge stream from the first column and a base component are mixed, to a second column;
recovering the ammonia from an upper discharge stream from the second column and separating purified wastewater
wherein the wastewater is produced from a manufacturing process of a homopolymer or copolymer latex including the nitrile-based monomer-derived unit, and
wherein a pH of the first mixed stream ranges from 1.5 to 5.5.