US 12,434,193 B2
Feed spacer for reducing differential pressure of reverse osmosis element, and formation nozzle
Taehyeong Kim, Daejeon (KR); Taeyoung Park, Daejeon (KR); Phill Lee, Daejeon (KR); Dae Hun Kim, Daejeon (KR); and Kyunghoon Min, Daejeon (KR)
Assigned to LG CHEM, LTD., Seoul (KR)
Appl. No. 17/598,566
Filed by LG CHEM, LTD., Seoul (KR)
PCT Filed Mar. 17, 2020, PCT No. PCT/KR2020/003568
§ 371(c)(1), (2) Date Sep. 27, 2021,
PCT Pub. No. WO2020/197141, PCT Pub. Date Oct. 1, 2020.
Claims priority of application No. 10-2019-0035633 (KR), filed on Mar. 28, 2019.
Prior Publication US 2022/0193610 A1, Jun. 23, 2022
Int. Cl. B01D 61/10 (2006.01); B01D 61/02 (2006.01); B01D 63/10 (2006.01); C02F 1/44 (2023.01)
CPC B01D 61/10 (2013.01) [B01D 61/025 (2013.01); B01D 63/101 (2022.08); C02F 1/441 (2013.01); B01D 2313/143 (2013.01)] 5 Claims
OG exemplary drawing
 
1. A feed spacer for reducing differential pressure in a reverse osmosis element, comprising a plurality of strands disposed in a mesh shape having predetermined intersection points, the plurality of strands forming a mesh having a two-layer structure, wherein a first set of the plurality of strands form a first layer, and a second set of the plurality of strands are disposed on the first layer forming a second layer,
wherein a vertical cross section of each of the strands of the first layer and the second layer has a rhombic shape having four sides that meet to form four vertexes, and a thickness of the first set of strands and a thickness of the second set of strands has a constant value of h/2, measured from a first vertex to an opposite non-adjacent second vertex of the rhombic shape,
wherein a thickness of the feed spacer has a constant value of h when the second layer is disposed on the first layer,
a length between the intersection points between the strands is 3.8 to 4.63 mm, the thickness of the feed spacer is 0.5 to 2.0 mm, and the differential pressure in the reverse osmosis element decreases as a ratio of the length between the intersection points of the strands to the thickness of the feed spacer increases, and the ratio of the length between the intersection points of the strands to the thickness of the feed spacer is 4.49 or more, and
an angle at one side of the intersection points of the first set of the plurality of strands and the second set of the plurality of strands is 75° to 80°.