Dow Global Technolgoies LLC

The Dow Chemical Company

William E Mickols

Chunming Zhang

Christopher Thomas Hamilton

Mou Paul

Q Jason Niu

Qingshan Jason Niu

Steven Douglas Jons

Daniel O Clark

John A Jensvold

Abhishek Roy

Henry N Beck

Michael Salvatore Ferritto

Frederick L Coan

David J Moll

Edgar S Sanders, Jr

Kenneth J Stutts

Michael S Koreltz

Martin H Peery

Peter K Kim

Wudneh Admassu

Allyn R Marsh, Iii

John C McKeen

Carleton L Gaupp

Donald B Streeter

Richard C Krauss

Markus Busch

Stuart Mcclellan

A method for making a composite polyamide membrane comprising a porous support and a thin film polyamide layer, wherein the method comprises the step of applying a polar solution including a polyfunctional amine monomer and non-polar solution including a polyfunctional acyl halide monomer to a surface of the porous support and interfacially polymerizing the monomers to form a thin film polyamide layer, wherein the method is characterized by the step of applying a non-polar solution comprising an aliphatic acyclic tertiary amine compound to the support.

Composite polyamide membrane derived from an aliphatic acyclic tertiary amine compound

A membrane comprising a blend of a sulfonated poly(aryl ether) and a phenol compound along with methods for making and using the same. Many additional embodiments are described including applications for such membranes.

Sulfonated poly(aryl ether) membrane including blend with phenol compound

Composite membranes including a coating of polyalkylene oxide and oxy-substituted phenyl compounds along with various methods for making and using the same. In one embodiment, the composite membrane comprises a thin film polyamide layer including a coating of a reaction product of a polyalkylene oxide compound and an oxy-substituted phenyl compound. In another embodiment, the coating comprises a polymer including alkylene oxide repeating units and one or more oxy-substituted phenyl functional groups.

Composite membrane with coating comprising polyalkylene oxide and oxy-substituted phenyl compounds

A membrane comprising a blend of a sulfonated poly(aryl ether) and a phenyl amine compound along with methods for making and using the same. Many additional embodiments are described including applications for such membranes.

Sulfonated poly (aryl ether) membrane including blend with phenyl amine compound

Composite membranes including a coating of polyalkylene oxide and biguanide compounds along with various methods for making and using the same. In one embodiment, the composite membrane comprises a thin film polyamide layer including a coating of a reaction product of a polyalkylene oxide compound and a biguanide-type compound. In another embodiment, the coating comprises a polymer including alkylene oxide repeating units and one or more biguanide functional groups.

Composite membrane with coating comprising polyalkylene oxide and biguanide-type compounds

Composite membranes including a coating of polyalkylene oxide and acetophenone compounds along with various methods for making and using the same. In one embodiment, the composite membrane comprises a thin film polyamide layer including a coating of a reaction product of a polyalkylene oxide compound and an acetophenone compound. In another embodiment, the coating comprises a polymer including alkylene oxide repeating units and one or more acetophenone functional groups.

Composite membrane including coating of polyalkylene oxide and acetophenone compounds

Composite membranes including a coating comprising a combination of polyalkylene oxide and imidazol compounds along with various methods for making and using the same. In one embodiment, the composite membrane comprises a thin film polyamide layer including a coating of a reaction product of a polyalkylene oxide compound and an imidazol compound. In another embodiment, the coating comprises a polymer including alkylene oxide repeating units and one or more imidazol functional groups.

Composite membrane with coating comprising polyalkylene oxide and imidazol compounds

Composite membranes including a coating of polyalkylene oxide and triazine compounds along with various methods for making and using the same. In one embodiment, the composite membrane comprises a thin film polyamide layer including a coating of a reaction product of a polyalkylene oxide compound and a triazine compound.

Composite membrane including coating of polyalkylene oxide and triazine compounds

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 modified polyamide membrane and method for making and using the same. The present invention includes many embodiments including methods comprising contacting a polyamide membrane with certain modifiers, including but not limited to certain oxazoline and/or thiazoline-based compounds, derivatives and polymers thereof. In one embodiment, the surface of a polyamide membrane is coated with a solution including a polyoxazoline and optionally a polyalkylene oxide material, followed by optional heating. Preferred embodiments may exhibit improved performance, e.g. increased rejection of certain species, (e.g. sodium chloride and/or boric oxides such as boric acid or various borate salts), reduced fouling, improved antimicrobial properties, and/or improved storage stability.

Modified polyamide membrane

Composite membranes that exhibit long-term resistance to biofouling comprise a porous support and a crosslinked polyamide discriminating layer having an external surface, the discriminating layer comprising a branched poly(alkylene oxide) (PAO) polymer attached to its external surface. The branched PAO polymer typically has the structure of a molecular comb or brush, and is made by polymerization of a PAO macromonomer of the following formula:RO&#x2014;[(CHR')&#x2014;O]&#x2014;Vin which R is hydrogen or a Caliphatic or aromatic group, V is any group containing a polymerizable site, each R&#x2032; is independently hydrogen or a short chain alkyl group, n is an integer of 1-6, and m is an integer of 1 to about 200. The &#x3b1; end group can be either polymerized or copolymerized.

Composite polyamide membrane with branched poly(alkylene oxide) modified surface

A multilayered modified membrane and method for making the same, comprising a modified discriminating layer that can have a fouling resistant surface, improved salt rejection, antimicrobial properties, and/or improved solute, and/or small organics rejection as compared to membranes with unmodified discriminating layers.

Modified membrane

A polyamide membrane and method for making and using the same, including use within a spiral wound module. While many different embodiments are described, one embodiment includes a polyamide membrane including a coating comprising a combination of a polyalkylene oxide compound and a polyacrylamide compound.

Polyamide membrane with coating of polyalkylene oxide and polyacrylamide compounds

A composite membrane and method for making the same, comprising a porous support and a polyamide surface. The subject membrane provides improved flux and/or rejection rates. The subject membrane is further capable of operating at lower operating pressures. The subject method includes reacting a polyfunctional amine with a polyfunctional acyl halide to form a polyamide. The method includes the step of contacting a complexing agent with the polyfunctional acyl halide prior substantial reaction between the polyfunctional acyl halide and a polyfunctional amine. The subject process is easily adapted to commercial scale manufacturing processes and is particularly suited for making nanofiltration and reverse osmosis composite membranes.

Growing community of inventors

Chanhassen, MN, United States of America

William E Mickols