Reducing aluminosilicate scale in the bayer process
AssigneeNalco Company
InventorsEverett C. Phillips, Timothy La, Kailas B. Sawant
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Abstract
The invention provides a method of inhibiting the accumulation of DSP scale in the liquor circuit of Bayer process equipment. The method includes adding one or more particular silane based small molecules to the liquor fluid circuit. These scale inhibitors reduce DSP scale formation and thereby increase fluid throughput, increase the amount of time Bayer process equipment can be operational and reduce the need for expensive and dangerous acid washes of Bayer process equipment. As a result, the invention provides a significant reduction in the total cost of operating a Bayer process.
Claims14
A method for the reduction of aluminosilicate containing scale in a Bayer process comprising the steps of
- adding to the Bayer process stream an aluminosilicate scale inhibiting amount of a composition comprising at least one small molecule, the at least one small molecule comprising at least three components, a first component of the at least three components having the general formula:
- where R′=CH2, or, CH2—CH2;
- and X=NH2, NH2-R′—NH2, or NH2-R′—NH2-R′—NH2
- a second component of the at least three components is 3-glycidoxypropyltrimethyloxysilane;
- and a third component of the at least three components is 2-ethylhexylglycidyl ether;
- wherein synthesis of the small molecule proceeds by combining the first component with the second component at a reactive hydrogen of the first component to form an intermediate, and then the intermediate reacted with the third component to form the small molecule.
Dependencies are inferred from the claim text.