The Dow Chemical Company

Dow Global Technolgoies LLC

James R Stahlbush

Kenneth L Foster

Donald A Tomalia

Robert M Strom

William I Harris

Thomas Caldwell Young

Johann-Wilhelm Frey

Harlan Robert Goltz

Katherine H Stahlbush, Legal Representative

Edward Alan Fraini

Thomas C Young

Harland Robert Goltz

A method for preventing the degradation of a catalyst during storage of the catalyst and prior to using the catalyst in a chemical process comprising treating the catalyst with an antioxidant and storing the treated catalyst until further use. The stabilized treated catalyst may be used in a process for producing organic chemicals such as in a process for producing bisphenol A.

Method for stabilizing a cation exchange resin prior to use as an acid catalyst and use of said stabilized cation exchange resin in a chemical process

A water treatment module and process for treating power plant condensate water utilizing a sulfonated ion exchange resin comprising copolymer beads having an interpenetrating polymer network of at least two polymer components wherein at least one of the polymer components is derived from a monomer mixture having a styrenic content less than about 80 molar percent. In one preferred embodiment the multiple polymer components include: (i) a first polymer component derived from a first monomer mixture comprising a monovinylidene monomer having a styrenic content less than about 50 molar percent and (ii) a second polymer component derived from a second monomer mixture comprising: a second monovinylidene monomer having a styrenic content greater than about 50 molar percent and a crosslinking agent. The ratio of the molar percent crosslinking agent of the first polymer component to the second polymer component is less than about 0.7. The present invention is more effective at removing colloidal iron from condensate water, releases fewer total leachables, releases leachables of a lower molecular weight and/or releases leachables having a reduced sulfonate content.

Treatment of power plant condensate water with ion exchange resins

Gel-type copolymer beads are described which are useful as ion exchange resins such as those used in the treatment of power plant condensate water. The subject copolymer beads possess an interpenetrating polymer network of at least two polymer components including: (i) a first polymer component derived from a first monomer mixture comprising a first monovinylidene monomer having a styrenic content less than about 50 molar percent and (ii) a second polymer component derived from a second monomer mixture comprising: a second monovinylidene monomer having a styrenic content greater than about 50 molar percent and a second crosslinking agent. The ratio of the molar percent crosslinking agent of the first polymer component to the second polymer component is less than about 0.7. Methods for making the subject beads and methods for their use as ion exchange resins for treating aqueous solutions are also provided.

Gel-type copolymer bead and ion-exchange resins made therefrom

Cation exchange resins with improved stability prepared by treating the resins with an antioxidant are disclosed.

Cation exchange resins incorporating antioxidants

Dense star polymers on immobilized cores are very useful as ion-exchange resins and chelation resins. For example, an aminated form of chloromethylated styrene/divinyl benzene copolymer can be employed as an immobilized core compound and reacted successively with methyl acrylate via a Michael addition reaction and then with ethylenediamine to form a first generation dense star polymer or dendrimer. These reactions can then be repeated to form second and third generation dendrimers.

Modified dense star polymers

An improved process for the recovery of precious metal values is disclosed. By this process precious metals in the form of anionic complexes are contacted with a weak-base anion exchange resin capable of complexing with the anionic complex. Such weak-base anion exchange resins contain weak-base functionalities derived from linear or cyclic polyaminoalkylene amines which have more than 1 amine moiety and at least 3 carbon atoms in a 1,X-alkylene moiety or moieties separating at least 1 amine moiety from a second amine moiety (i.e., X is an integer greater than 2).

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Midland, MI, United States of America

James R Stahlbush