Cytec Technology Corporation

American Cyanamid Company

Donald Paul Spitzer

Howard Ivan Heitner

Alan S Rothenberg

Frank Kula

David W Lipp

Matthew L Taylor

Samuel S Wang

William E Bambrick

H-L Tony Chen

Hans P Panzer

Haunn-Lin Tony Chen

Morris E Lewellyn

Qi Dai

Peter V Avotins

Matthew Taylor

Peter J Strydom

Wei S Yen

Robert Henry Ebel

Patrick Bair

Skip Bode

Huann-Lin Tony Chen

H-L Chen

Hydrophobically modified Si-containing polyamines are useful for treating scale in industrial process streams. Preferred hydrophobically modified Si-containing polyamines are particularly useful for treating aluminosilicate scale in difficult-to-treat industrial process streams, such as in the Bayer alumina process streams, nuclear waste streams and kraft paper mill effluent streams.

Hydrophobically modified polyamine scale inhibitors

The suspended solids content of a Bayer process stream is reduced by contacting the stream with silicon-containing polymers.

Use of silicon-containing polymers to improve red mud flocculation in the bayer process

Materials and a method are provided whereby polymers with least 0.5 mole % of the pendant group or end group containing &#x2014;Si(OR&#x2033;)(where R&#x2033; is H, an alkyl group, Na, K, or NH) are used to control aluminosilicate scaling in an industrial process having an alkaline process stream such as a pulping mill process stream. When materials of the present invention are added to the alkaline process stream, they reduce and even completely prevent formation of aluminosilicate scale on equipment surfaces such as evaporator walls and heating surfaces. The present materials are effective at treatment concentrations that make them economically practical.

Compositions for preventing or reducing aluminosilicate scale in industrial processes

Materials and a method are provided whereby polymers with least 0.5 mole % of the pendant group or end group containing &#x2014;Si(OR&#x2033;)3 (where R&#x2033; is H, an alkyl group, Na, K, or NH4) are used to control aluminosilicate scaling in an industrial process having an alkaline process stream such as a pulping mill process stream. When materials of the present invention are added to the alkaline process stream, they reduce and even completely prevent formation of aluminosilicate scale on equipment surfaces such as evaporator walls and heating surfaces. The present materials are effective at treatment concentrations that make them economically practical.

Composition for preventing or reducing aluminosilicate scale in industrial processes

Materials and a process are provided whereby polymers with the pendant group or end group containing &#x2014;Si(OR&#x2033;)(where R&#x2033; is H, an alkyl group, Na, K, or NH) are used to control aluminosilicate scaling in a Bayer process. When materials of the present invention are added to the Bayer liquor before the heat exchangers, they reduce and even completely prevent formation of aluminosilicate scale on heat exchanger walls. The present materials are effective at treatment concentrations that make them economically practical.

Polymers for preventing or reducing aluminosilicate scale in a bayer process

Method and compositions for preventing or reducing aluminosilicate scale in alkaline industrial processes

Materials and a process are provided whereby polymers with the pendant group or end group containing &mdash;Si(OR&Prime;) (where R&Prime; is H, an alkyl group, Na, K, or NH ) are used to control aluminosilicate scaling in a Bayer process. When materials of the present invention are added to the Bayer liquor before the heat exchangers, they reduce and even completely prevent formation of aluminosilicate scale on heat exchanger walls. The present materials are effective at treatment concentrations that make them economically practical.

Method of preventing or reducing aluminosilicate scale in a bayer process

A process for reducing the level of colloidal iron in a Bayer process stream comprises intermixing an amidoxime polymer with a Bayer process stream and separating the resultant polymer-iron complex to provide purified sodium aluminate solution.

Process for purifying alumina by mixing a Bayer process stream

The use of a dewatering aid comprising a sulfosuccinate and an oil in the filtration of alumina trihydrate is disclosed.

Dewatering of alumina trihydrate

A process is disclosed for reducing the turbidity of a Bayer process liquor containing a cationic polymer-humate complex comprising adding to said liquor a higher molecular weight, cationic polymer.

Removal of humate from bayer alumina liquors

A novel polymer composition comprising recurring units of the formula: ##STR1## wherein each R.sup.1 is, individually, hydrogen or C.sub.1 -C.sub.4 alkyl; each R.sup.5, individually, is hydrogen or a C.sub.1 -C.sub.4 lower alkyl group; X is OH or SH; Y is OR.sup.2, SR.sup.2, NR.sub.2.sup.2, or NR.sup.2 -NR.sub.2.sup.2 ; R.sup.2 is hydrogen, a C.sub.1 -C.sub.4 lower alkyl or a C.sub.1 -C.sub.4 substituted lower alkyl, no more than one of Y and X being hydroxyl, and M is hydrogen, an alkali metal cation or an ammonium ion; x represents a residual mole percent fraction; y is a mole percent fraction ranging from about 0.5% to about 25%; z is a mole percent fraction ranging from about 0% to about 25%; and the molecular weight of the polymer is between about 1,000 and 500,000.

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Stamford, CT, United States of America

Donald Paul Spitzer