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公开(公告)号：US20180104649A1
公开(公告)日：2018-04-19
申请号：US15786973
申请日：2017-10-18
Applicant: Gradiant Corporation
Inventor： Prakash Narayan Govindan , Looh Tchuin Choong
CPC classification number: B01D61/025 , B01D61/022 , B01D61/14 , B01D69/02 , B01D69/10 , B01D69/12 , B01D71/56 , B01D71/64 , B01D71/68 , B01D2311/25 , B01D2323/24 , B01D2323/39 , B01D2325/04 , C02F1/441 , C02F1/444
Abstract: An osmotic membrane comprises an active layer and a composite support layer. The active layer selectively allows passage of water molecules but rejects at least some dissolved ions. The composite support layer includes a side that is bonded to the active layer and comprises an electrospun-fiber sub-layer and a phase-inversion sub-layer.
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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
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.
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公开(公告)号：US20210179452A1
公开(公告)日：2021-06-17
申请号：US17270142
申请日：2019-08-22
Applicant: Gradiant Corporation
Inventor： Richard Stover , Looh Tchuin Choong , Maximus G. St. John , Prakash Narayan Govindan
Abstract: Liquid solution concentration systems, and related methods, are generally described. In some embodiments, the system is an osmotic system comprising a plurality of osmotic modules. For example, the osmotic system can comprise a feed osmotic module configured to produce an osmotic module retentate outlet stream having a higher concentration of solute than the retentate inlet stream transported to the feed osmotic module. The osmotic system can also comprise an isolation osmotic module fluidically connected to the feed osmotic module. The osmotic system can also optionally comprise a purification osmotic module fluidically connected to the feed osmotic module and/or the isolation osmotic module. Certain embodiments are related to altering the degree to which the feed osmotic module retentate outlet stream is recycled back to the retentate-side inlet of the feed osmotic module during operation. Additional embodiments are related to the manner in which the retentate-side effluent from the isolation osmotic module is distributed among the system modules during operation.
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公开(公告)号：US20200231473A1
公开(公告)日：2020-07-23
申请号：US15757803
申请日：2016-09-08
Applicant: Gradiant Corporation
Inventor： Looh Tchuin Choong , Prakash Narayan Govindan , Maximus G. St. John
Abstract: Described herein are systems and methods for removing boron from water. According to certain embodiments, an aqueous input stream comprising boron and at least one suspended and/or emulsified immiscible phase is supplied to a water treatment system comprising a chemical coagulation apparatus, a suspended solids removal apparatus, and a boron removal apparatus. Within the chemical coagulation apparatus, an amount of an inorganic coagulant, an amount of a strong base, and an amount of a polyelectrolyte may be added to the aqueous input stream to form a chemically-treated stream. In some embodiments, the chemically-treated stream, which may comprise a plurality of floes, may be directed to flow to the suspended solids removal apparatus. Within the suspended solids removal apparatus, at least a portion of the floes may be removed from the chemically-treated stream to form a contaminant-diminished stream having a lower concentration of contaminants than the aqueous input stream.
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公开(公告)号：US10245555B2
公开(公告)日：2019-04-02
申请号：US15752626
申请日：2016-08-12
Applicant: Gradiant Corporation
Inventor： Maximus G. St. John , Looh Tchuin Choong , Prakash Narayan Govindan
Abstract: Disclosed herein are systems and methods in which ion-selective separation and multi-stage osmotic separation is used to produce multivalent-ion-rich process streams. According to certain embodiments, multiple separations may be used to process an aqueous feed stream containing solubilized monovalent ions and solubilized multivalent ions to produce a stream enriched in the multivalent ions. The separations may be arranged, according to certain embodiments, to enhance the overall separation process such that the product stream contains—relative to the initial aqueous feed stream—a high amount of multivalent ions, a high amount of water from the aqueous feed stream, and/or a high ratio of multivalent ions to monovalent ions.
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Patent Agency Ranking
公开(公告)号：US20240091714A1
公开(公告)日：2024-03-21
申请号：US18262818
申请日：2022-02-02
Applicant: Gradiant Corporation , National University of Singapore
Inventor： Looh Tchuin Choong , Liang Canzeng , Chung Shung , Mohammad Askari
CPC classification number: B01D69/02 , B01D69/081 , B01D69/1251 , B01D71/56 , B01D2325/025 , B01D2325/026 , B01D2325/04 , B01D2325/20 , B01D2325/24 , C02F1/441
Abstract: A thin-film-composite hollow-fiber membrane includes a phase-inversion layer, which is in the form of a hollow fiber, and an active layer coated on the phase-inversion layer. The active layer selectively allows passage of water molecules but rejects at least some dissolved ions. The thin-film-composite hollow-fiber membrane can have an internal burst pressure of at least 4 MPa. In a method for forming the membrane, the polymer concentration in the spinning dope from which the hollow-fiber substrate is formed can have a polymer concentration no greater than 5% below the critical concentration.
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公开(公告)号：US10888820B2
公开(公告)日：2021-01-12
申请号：US15786973
申请日：2017-10-18
Applicant: Gradiant Corporation
Inventor： Prakash Narayan Govindan , Looh Tchuin Choong
IPC: B01D61/02 , B01D61/14 , B01D71/56 , B01D71/64 , C02F1/44 , B01D69/02 , B01D69/12 , B01D69/10 , B01D71/68
Abstract: An osmotic membrane comprises an active layer and a composite support layer. The active layer selectively allows passage of water molecules but rejects at least some dissolved ions. The composite support layer includes a side that is bonded to the active layer and comprises an electrospun-fiber sub-layer and a phase-inversion sub-layer.
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公开(公告)号：US20200147554A1
公开(公告)日：2020-05-14
申请号：US16681533
申请日：2019-11-12
Applicant: Gradiant Corporation
Inventor： Looh Tchuin Choong , Prakash Narayan Govindan , Maximus G. St. John , Steven Lam , Jonn-Ross Andrews , Karim M. Chehayeb
Abstract: Provided herein are osmotic desalination methods and associated systems. According to certain embodiments, multiple osmotic membranes may be used to perform a series of osmosis steps, such that an output stream having a relatively high water purity—compared to a water purity of an aqueous feed stream—is produced. In some embodiments, multiple draw streams can be used to produce aqueous product streams having sequentially higher purities of water. Certain embodiments are related to osmotic desalination systems and methods in which forward osmosis is used to produce a first product stream having a relatively high water purity relative to an aqueous feed stream, and reverse osmosis is used to perform a second step (and/or additional steps) on the first product stream. In some embodiments, multiple reverse osmosis steps can be used in series to perform a net desalination process.
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公开(公告)号：US10301198B2
公开(公告)日：2019-05-28
申请号：US15752619
申请日：2016-08-12
Applicant: Gradiant Corporation
Inventor： Maximus G. St. John , Looh Tchuin Choong , Prakash Narayan Govindan
Abstract: Disclosed herein are systems and methods in which multivalent ions are selectively retained in an aqueous stream. According to certain embodiments, multiple separations may be used to process an aqueous feed stream containing solubilized monovalent ions and solubilized multivalent ions to produce a stream enriched in the solubilized multivalent ions. The separations may be arranged, according to certain embodiments, to enhance the overall separation process such that the product stream contains—relative to the initial aqueous feed stream—a high amount of solubilized multivalent ions, a high amount of water from the aqueous feed stream, and/or a high ratio of solubilized multivalent ions to solubilized monovalent ions.
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公开(公告)号：US11629072B2
公开(公告)日：2023-04-18
申请号：US17270142
申请日：2019-08-22
Applicant: Gradiant Corporation
Inventor： Richard Stover , Looh Tchuin Choong , Maximus G. St. John , Prakash Narayan Govindan
IPC: B01D61/02 , C02F1/44 , C02F103/08
Abstract: Liquid solution concentration systems, and related methods, are generally described. In some embodiments, the system is an osmotic system comprising a plurality of osmotic modules. For example, the osmotic system can comprise a feed osmotic module configured to produce an osmotic module retentate outlet stream having a higher concentration of solute than the retentate inlet stream transported to the feed osmotic module. The osmotic system can also comprise an isolation osmotic module fluidically connected to the feed osmotic module. The osmotic system can also optionally comprise a purification osmotic module fluidically connected to the feed osmotic module and/or the isolation osmotic module. Certain embodiments are related to altering the degree to which the feed osmotic module retentate outlet stream is recycled back to the retentate-side inlet of the feed osmotic module during operation. Additional embodiments are related to the manner in which the retentate-side effluent from the isolation osmotic module is distributed among the system modules during operation.
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