公开(公告)号：US20240109037A1

公开(公告)日：2024-04-04

申请号：US18315130

申请日：2023-05-10

Applicant: Gradiant Corporation

Inventor： Omkar Lokare ,  Richard Stover ,  Looh Tchuin Choong ,  Kurt Blohm ,  Ana Claudia Emerenciano Guedes

IPC: B01D61/02 ,  B01D69/02 ,  C02F1/44

CPC classification number: B01D61/026 ,  B01D69/02 ,  C02F1/441 ,  B01D2317/022 ,  B01D2317/025 ,  B01D2317/04 ,  B01D2325/34 ,  C02F2103/08

Abstract: Liquid solution separation (e.g., concentration and/or desalination) methods and related systems involving membrane separators having at least one-semipermeable membrane are provided. In some instances, at least some of the membrane separators permit a portion of solute in a retentate side input stream to pass through the semi-permeable membrane. In some instances, multiple membrane separators are employed, with the membrane separators having different solute permeabilities (e.g., due to varying pore size and/or molecular weight cutoffs). The methods and systems may be configured such that the ratio of mass flow and/or concentration of solute entering the retentate sides of the membrane separators are relatively high compared to the mass flow and/or concentration of solute exiting the retentate sides of the membrane separators. Such ratios may be relatively high for some or all membrane separators employed, which can in some instances reduce capital and/or operational expenditures for the liquid separation processes.

公开(公告)号：US20240293775A1

公开(公告)日：2024-09-05

申请号：US18574595

申请日：2022-07-01

Applicant: Gradiant Corporation

Inventor： Omkar Lokare ,  Richard Stover

IPC: B01D61/02 ,  B01D61/08 ,  B01D67/00 ,  B01D69/10 ,  B01D71/56 ,  C02F1/44

CPC classification number: B01D61/026 ,  B01D61/08 ,  B01D67/0006 ,  B01D69/1071 ,  B01D71/56 ,  C02F1/441 ,  B01D2311/08 ,  B01D2313/243 ,  B01D2317/022 ,  C02F2301/08

Abstract: A serial filtration system for liquid purification includes a preliminary-stage reverse-osmosis (RO) module and a first-stage, high-permeability, reverse-osmosis (HiRO) module. Both modules include (a) a chamber including an inlet, a retentate outlet, and a permeate outlet, and (b) at least one membrane separating the chamber into a retentate side on an upstream side of the membrane and a permeate side on a downstream side of the membrane. The membrane in the preliminary stage is an RO membrane, while the membrane in the first stage is an oxidized membrane. The first-stage inlet is in fluid communication with the preliminary-stage, retentate outlet; and the oxidized membrane in the first stage, comprises an oxidized polyamide active layer coated on a porous support, wherein the oxidized polyamide active layer has an atomic oxygen/nitrogen ratio of at least 1.5.

公开(公告)号：US20230001355A1

公开(公告)日：2023-01-05

申请号：US17305289

申请日：2021-07-02

Applicant: Gradiant Corporation

Inventor： Omkar Lokare ,  Richard Stover

IPC: B01D61/08 ,  B01D61/02 ,  B01D71/56 ,  B01D67/00 ,  C02F1/44

Abstract: A serial filtration system for liquid purification includes a preliminary-stage reverse-osmosis (RO) module and a first-stage, high-permeability, reverse-osmosis (HiRO) module. Both modules include (a) a chamber including an inlet, a retentate outlet, and a permeate outlet, and (b) at least one membrane separating the chamber into a retentate side on an upstream side of the membrane and a permeate side on a downstream side of the membrane. The membrane in the preliminary stage is an RO membrane, while the membrane in the first stage is an oxidized membrane. The first-stage inlet is in fluid communication with the preliminary-stage, retentate outlet; and the oxidized membrane in the first stage, comprises an oxidized polyamide active layer coated on a porous support, wherein the oxidized polyamide active layer has an atomic oxygen/nitrogen ratio of at least 1.5.

公开(公告)号：US11534719B1

公开(公告)日：2022-12-27

申请号：US17305289

申请日：2021-07-02

Applicant: Gradiant Corporation

Inventor： Omkar Lokare ,  Richard Stover

IPC: B01D61/08 ,  B01D61/02 ,  B01D71/56 ,  C02F1/44 ,  B01D67/00

Abstract: A serial filtration system for liquid purification includes a preliminary-stage reverse-osmosis (RO) module and a first-stage, high-permeability, reverse-osmosis (HiRO) module. Both modules include (a) a chamber including an inlet, a retentate outlet, and a permeate outlet, and (b) at least one membrane separating the chamber into a retentate side on an upstream side of the membrane and a permeate side on a downstream side of the membrane. The membrane in the preliminary stage is an RO membrane, while the membrane in the first stage is an oxidized membrane. The first-stage inlet is in fluid communication with the preliminary-stage, retentate outlet; and the oxidized membrane in the first stage, comprises an oxidized polyamide active layer coated on a porous support, wherein the oxidized polyamide active layer has an atomic oxygen/nitrogen ratio of at least 1.5.