Dow Global Technolgoies LLC

The Dow Chemical Company

Johann-Wilhelm Frey

Damian Feord

Emil Patrascu

Robert E Hefner, Jr

Michael J Mullins

Thomas Caldwell Young

Bernd Hoevel

James R Stahlbush

Guillaume Metral

Ulrich Wallbaum

Jochen Gressmann

Mihail Paliuras

Edward Alan Fraini

Dieter Tank

Manfred Hagel

Thomas C Young

Harland Robert Goltz

Robert E Hefner

An epoxy resin composition prepared from a dihydroxydiphenyl-cycloalkane compound to form a diglycidyl ether of dihydroxydiphenyl cycloalkane compound which may be useful for making various products including, for example, powder coatings, composites and electrical laminates.

Epoxy resin compositions

A strong-acid cation exchange resin comprising a plurality of acid groups which are partially neutralized with a cation of formula (I); wherein Rat each occurrence independently is hydrogen or a Ci-4-alkyl group, Rat each occurrence independently is hydrogen, alkyl or aryl, Rat each occurrence independently is hydrogen or alkyl or two vicinal groups Rtogether form an aromatic ring, m is 1, 2, 3, 4, 5 or 6, n is 1, 2, 3 or 4, o is 1 or 2, and p is 1, 2 or 3, is useful in the production of bisphenols. 

Strong-acid cation exchange resins

A process for recovering a solid adduct of a bis(4-hydroxyaryl)alkane and a phenolic compound from a suspension comprising the addict is disclosed. The process comprises the steps of a) supplying the suspension to a rotary filter, b) filtering the supplied suspension in the rotary filter to retain adduct as an adduct cake, c) pre-drying the adduct cake with an inert gas, d) washing the pre-dried adduct cake, e) optionally drying the washed adduct cake, and f) discharging the washed adduct cake from the rotary filter.

Process for recovering an adduct of a bis(4-hydroxyaryl)alkane and a phenolic compound

Bisphenol-A is purified in a process which comprises the following steps: a) cooling a liquid mixture comprising bisphenol-A and water in a bisphenol-A crystallizer to form bisphenol-A crystals in a liquid phase; b) separating the bisphenol-A crystals from the liquid phase; c) dividing at least a portion of the liquid phase into a bisphenol-rich organic phase and a water-rich phase; d) feeding phenol and at least a portion of the bisphenol-rich organic phase into a adduct crystallizer to form a crystalline adduct of phenol and bisphenol-A in a mother liquor, and e) separating the crystalline adduct from the mother liquor. Bisphenol-A of high purity at a high yield is obtained.

Process for purifying bisphenol-a

A strong-acid cation exchange resin in acid form is contacted with an alkylcarhamoyl alkylthioester in the presence of water for producing a strong-acid cation exchange resin comprising a plurality of acid groups being partially neutralized with a mercaptoalkylamine. The produced partially neutralized cation exchange resin is useful as a catalyst in a process of producing a bisphienol by reaction of a phenolic compound with a carhonyl compound.

Process for producing a strong-acid cation exchange resin

Process for preparing a bisphenol

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Stade, Germany

Johann-Wilhelm Frey