Dow Global Technolgoies LLC

The Dow Chemical Company

Ddp Specialty Electronic Materials Us, LLC

Michael S Koreltz

Steven Douglas Jons

Luke Franklin

David J Moll

William E Mickols

Glen W Peterson

Mark D Huschke

Jessica Y Shu

Jia Ning

Donald B Streeter

A spiral wound membrane module adapted for hyperfiltration and including at least one membrane envelope and feed spacer sheet wound about a central permeate tube to form an inlet and outlet scroll face and an outer periphery,

Spiral wound membrane module adapted for high recovery

A spiral wound membrane module adapted for hyperfiltration and including at least one membrane envelope and feed spacer sheet wound about a central permeate tube to form an inlet and outlet scroll face and an outer periphery, wherein the feed spacer sheet includes: i) a feed entrance section extending along the permeate collection tube from the inlet scroll face toward the outlet scroll face, ii) a feed exit section extending along the outer periphery from the outlet scroll face toward the inlet scroll face, and iii) a central feed section located between the feed entrance section and the feed exit section; and wherein the feed entrance section has a median resistance to flow in a direction parallel to the permeate collection tube that is less than 25% of the median resistance to flow of the central feed section in a direction perpendicular to the permeate collection tube.

A filter assembly adapted for insertion into an inner chamber of a pressure vessel, wherein the assembly includes: a spiral wound membrane module including at least one membrane envelope and feed spacer sheet concentrically wound about a central permeate tube extending along an axis (X) forming an inlet scroll face and outlet scroll face and a cylindrical outer peripheral surface, and a brine seal disposed concentrically about a portion of the outer peripheral surface; characterized by the brine seal including: i) a radially extending flexible lip defining a maximum outer diameter adapted to engage the inner chamber of the pressure vessel, ii) an end cap surface covering a portion of the first scroll face, and iii) at least one opening in the end cap surface for permitting fluid to flow through the inlet scroll face and into the feed spacer sheet of the module.

Filter assembly including spiral wound membrane module and brine seal

A water treatment assembly () and method for its operation, comprising a spiral wound hyperfiltration membrane module () connected to: i) a feed line () adapted for connection to a source of pressurized feed water, ii) a permeate line () adapted for connection to a dispenser of treated water and iii) a concentrate line () adapted for connection with a drain; wherein the assembly includes a pressurizable reservoir () containing weak acid cation exchange resin () and further includes at least one valve for selectively diverting flow of pressurized feed water along the feed line (), through the reservoir () and returning to the feed line () prior to passing through the hyperfiltration membrane module ().

Water treatment assembly including hyperfiltration module and cation exchange resin

A spiral wound module assembly comprising: a permeate collection tube, at least one membrane envelope wound about the permeate collection tube, an outer module housing, and at least one acoustic transducer located adjacent to the permeate collection tube. Several embodiments are disclosed including a stand-alone probe adapted for insertion into the permeate collection tube. In several other embodiments, one or more transducers are secured to the inner surface of the permeate collection tube. The invention further includes a method of measuring membrane fouling within a spiral wound module comprising the steps of: a) transmitting an acoustic signal from a location adjacent to the permeate collection tube; b) receiving an echo signal resulting from the transmitted acoustic signal reflecting from an interface within the module; c) providing a reference signal corresponding to a known state of membrane fouling; d) comparing the echo signal to the reference signal; and e) determining a state of membrane fouling based upon the comparison of the echo signal and reference signal.

Use of acoustic signals for measuring membrane fouling in spiral wound modules

A method for making dual-sided membrane sheet comprises the steps of: a) forming a microporous polymer sheet including a plurality of capillary channels and b) forming a semi-permeable discriminating layer upon at least a portion of the opposing outer surfaces of the sheet, wherein the sheet is advanced along a production pathway during at least a portion of: step a), step b), or while transferring the sheet from step a) to step b) by engaging the sheet along one or more of its edge sections.

Dual-sided membrane sheet and method for making the same

By making the fluid seal an integral part of either the filter element or the filter housing, the reliability of fluid filter assemblies is improved. In addition, the process for manufacturing filter assemblies and their individual components can be more easily automated.

Growing community of inventors

Bloomington, MN, United States of America

Michael S Koreltz