SILICA PARTICLE MANUFACTURING PROCESS

Title:

SILICA PARTICLE MANUFACTURING PROCESS

Document Type and Number:

WIPO Patent Application WO/2011/127104

Kind Code:

A3

Abstract:

Methods of forming a silica-based products are disclosed. One method comprises: (a) providing a silica containing precursor (SCP) contained in solution that has a pH less than or equal to a pH of 7; (b) optionally doping the SCP with one or more metal species, wherein said doping occurs when the solution has a pH less than or equal to a pH of 7; (c) adjusting the pH of the solution to greater than 7; (d) adding an effective amount of salt to the solution so that the conductivity of the solution is greater than or equal to 4 mS, wherein said addition occurs prior to, simultaneous with, or after the pH adjustment in step 1c; (e) optionally filtering and drying the SCP; and (f) optionally reacting the dried product from step e with a functional group and optionally wherein the resultant functionalized dried product is at least one of the following: a functionalized metal oxide-doped or metal sulfide-doped silica product. Another method comprises: (a) providing a silica containing precursor (SCP) contained in solution that has a pH greater than 7; (b) adjusting the pH of the solution to less than or equal to 7; (c) optionally doping the SCP with one or more metal species, wherein said doping occurs when the solution has a pH less than or equal to a pH of 7; (d) adjusting the pH of the solution to greater than 7; (e) adding an effective amount of salt to the solution so that the conductivity of the solution is greater than or equal to 4 mS, wherein said addition occurs prior to, simultaneous with, or after the pH adjustment in step 2d; (f) optionally filtering and drying the SCP; and (g) optionally reacting the dried product from step f with a functional group and optionally wherein the resultant functionalized dried product is at least one of the following: a functionalized metal oxide-doped or metal sulfide-doped silica product.

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Inventors:

KEISER BRUCE A (US)
ERGANG NICHOLAS S (US)
MIMNA RICHARD (US)
SHOWALTER BRETT M (US)

Application Number:

PCT/US2011/031317

Publication Date:

February 23, 2012

Filing Date:

April 06, 2011

Export Citation:

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Assignee:

NALCO CO (US)
KEISER BRUCE A (US)
ERGANG NICHOLAS S (US)
MIMNA RICHARD (US)
SHOWALTER BRETT M (US)

International Classes:

C01B33/157; C01B33/18; C09C1/30; C09C3/00

Foreign References:

US20050170109A1	2005-08-04
US6752864B2	2004-06-22
US20060078696A1	2006-04-13
US20060013971A1	2006-01-19
US4474896A	1984-10-02

Other References: