C - Chemistry – Metallurgy – 01 – B
Patent
C - Chemistry, Metallurgy
01
B
23/184, 252/37
C01B 33/18 (2006.01) B01J 29/035 (2006.01) C01B 37/02 (2006.01)
Patent
CA 1230216
TITLE Ultrapure Crystalline Silica Polymorphs and Process for the Preparation Thereof ABSTRACT A process is disclosed for the preparation of ultrapure crystalline silica polymorphs using organosilicon as the silica source. The polymorphs consist essentially of silicon and oxygen, other metals being substantially absent, for example, aluminum being present in a concentration below 55 ppm. The polymorphs are prepared from organosilicon compounds having the formula Image wherein A is a group selected from the class consisting of H, OH, R1, OR2, Cl, phenoxy, Image X,Y, and Z are the san e or different and a e grou ?s selected from the class consisting of R4, OR5, phenoxy and phenyl and wherein one of the groups is additionally hydroxyl. R1-5 are the same or different and are selected from the class consisting of alkyl groups having 1-10 carbon atoms and cycloalkyl groups having 5-10 carbon atoms, m is an integer of 1-10 and n is an integer of 1-5, preferably 1-2. The reaction is carried out in aqueous basic medium in the range 100 to 300°C. The polymorphs are useful in preparing catalyst bases having substantially no surface acidity relative to other types of silicas.
448442
E. I. Du Pont de Nemours And Company
Mccallum Brooks & Co.
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