Compositions – Preservative agents – Anti-oxidants or chemical change inhibitants
Patent
1980-05-21
1981-11-17
Dees, Carl F.
Compositions
Preservative agents
Anti-oxidants or chemical change inhibitants
252458, 423338, 526106, B01J 2108, B01J 2106, B01J 2326
Patent
active
043010342
ABSTRACT:
A method comprising combining a silicate ester and water under hydrolysis conditions in the presence of a sufficient amount of solvent that the reaction mixture remains as a single phase, adding sufficient acid neutralizing agent to form a gel and separating solvent and water from the resulting silica. In a preferred embodiment, the ester and water are added to a very small amount of solvent, the addition of water being sufficiently slow that it is added at about the rate it is used up in the hydrolysis reaction. The resulting silica does not require the washing step to remove alkali metal ions since it is not made from sodium silicate, and it has large pore structure because it can be made in a relatively concentrated solution because of the use of only a minimum amount of solvent and also because the hydrolysis is carried out under conditions wherein only a single phase is produced. The resulting silica is suitable for chromatographic columns and fillers in rubber and plastics but is of primary utility as a base for a chromium oxide catalyst because of its simplicity in production and inherent large pore volume.
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Dees Carl F.
Phillips Petroleum Company
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