US 12,258,286 B2
Method of concentrating high-salinity raw water
Jongbum Park, Daejeon (KR); Phill Lee, Daejeon (KR); Younghoon Ko, Daejeon (KR); and Young Jun Shin, Daejeon (KR)
Assigned to LG Chem, Ltd., Seoul (KR)
Appl. No. 17/617,387
Filed by LG CHEM, LTD., Seoul (KR)
PCT Filed Sep. 24, 2020, PCT No. PCT/KR2020/012956
§ 371(c)(1), (2) Date Dec. 8, 2021,
PCT Pub. No. WO2021/060872, PCT Pub. Date Apr. 1, 2021.
Claims priority of application No. 10-2019-0119618 (KR), filed on Sep. 27, 2019.
Prior Publication US 2022/0250949 A1, Aug. 11, 2022
Int. Cl. C02F 1/44 (2023.01); B01D 61/02 (2006.01)
CPC C02F 1/441 (2013.01) [B01D 61/025 (2013.01)] 4 Claims
 
1. A method for concentrating high-salinity raw water to obtain produced water satisfying the following <Equation 1>, the method comprising passing the high-salinity raw water having a salt concentration of 70,000 ppm or greater through a separation membrane at a temperature of 40° C. or less and a pressure of greater than or equal to 400 psi and less than or equal to 900 psi:
Ns=B*(Cm−Cp),  <Equation 1>
wherein in the <Equation 1>:
B is a salt permeability constant (B-value) of the separation membrane, and is 3 gallons per square foot per day (GFD) (gal/ft2/day)≤B≤150 gallons per square foot per day (GFD) (gal/ft2/day);
Ns is an amount of salt permeating the separation membrane (GFD*ppm), and has a value of Fp*Cp;
Cm is a raw water-side separation membrane surface concentration (membrane concentration) (ppm); and
Cp is a produced water salt concentration (permeate concentration) (ppm),
wherein Fp is produced water flux (permeate flux), and is 5 GFD≤Fp≤100 GFD,
wherein an osmotic pressure of the produced water is from 15% to 90% of an osmotic pressure of the high-salinity raw water, and
wherein the separation membrane is a reverse osmosis membrane.