Silane substituted polyalkylene oxide reagents and methods of using for preventing or reducing aluminosilicate scale in industrial processes
AssigneeCytec Technology Corp.
InventorHoward Heitner
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Abstract
Materials and methods are provided whereby polymers with least 0.5 mole % of the pendant group or end group containing —Si(OR″)3 are used to control aluminosilicate scaling in an industrial process having an alkaline process stream such as a pulping mill process stream or a high level nuclear waste processing plant. 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.
Claims13
A composition for preventing or reducing aluminosilicate scale in an industrial process having an alkaline process stream comprising a polymer according to the formula:
- A-{CH2CHOHCH2O—(CH2CH2O)x(CH2CH(CH3)O)y(CH2CH2O)z—CH2CHOHCH2O—(B)}a—
- wherein,
- a=2-100, x/x+y+z=5-100%, y/x+y+z and z/x+y+z=0-100%;
- A is chosen from —NH(CH2)1-20—Si(OR″)3 and —NH—Ar—Si(OR″)3;
- repeating unit B is chosen from —N(CH2)1-20—Si(OR″)3 and —N—Ar—Si(OR″)3, wherein:
- Ar is an aryl or aralkyl group;
- and
- R″ is a substituent selected from the group consisting of H;
- a C1-C20 alkyl, alkenyl, aryl, or aralkyl group optionally substituted;
- a group I or II metal;
- and ammonium salts of formula NR1R2R3R4+, wherein R1, R2, R3, R4, are independently selected from the group consisting of:
- H;
- and a C1-C20 alkyl, alkenyl, aryl, or aralkyl group optionally substituted.
A composition for preventing or reducing aluminosilicate scale in an industrial process having an alkaline process stream comprising a polymer according to the formula
- A-{CH2CHOHCH2O—(CH2CH2O)x(CH2CH(CH3)O)y(CH2CH2O)z—CH2CHOHCH2O—(B)}a-
- wherein,
- a=2-100, x/x+y+z=5-100%, y/x+y+z and z/x+y+z=0-100%;
- A is a group containing an —Si(OR″)3 group;
- and
- repeating unit B is a group containing an —Si(OR″)3 group;
- wherein R″ is a substituent selected from the group consisting of H;
- a C1-C20 alkyl, alkenyl, aryl, or aralkyl group optionally substituted;
- a group I or II metal;
- and ammonium salts of formula NR1R2R3R4+,wherein R1, R2, R3, R4 are independently selected from the group consisting of:
- H;
- and a C1-C20 alkyl, alkenyl, aryl, or aralkyl group optionally substituted.
Dependencies are inferred from the claim text.