Liquid purification or separation – Processes – Separating
Patent
1997-03-07
1998-05-12
McCarthy, Neil
Liquid purification or separation
Processes
Separating
210778, 423331, B01D 3702
Patent
active
057500380
ABSTRACT:
A novel method is proposed for the preparation of a calcium silicate powder particularly useful as a filter aid in the filtration of an acidic aqueous liquid by virtue of the extremely high acid resistance of the calcium silicate powder. The inventive method comprises a hydrothermal reaction of a blend of a silica-containing material and calcium oxide or hydroxide in a specified molar ratio under specified reaction conditions to form calcium silicate, which is then subjected to a heat treatment at 800.degree.-1200.degree. C. for 0.5-2 hours. An improvement can be obtained in the clarity of the filtrate obtained by the filtration using the calcium silicate powder prepared by the inventive method as a filter aid when the hydrothermal reaction for the preparation thereof is conducted in an aqueous solution of potassium hydroxide in a specified concentration.
REFERENCES:
patent: 3136360 (1964-06-01), Ramos et al.
patent: 3928539 (1975-12-01), Satoh et al.
patent: 4094150 (1978-06-01), Clarke
patent: 4162924 (1979-07-01), Kubo et al.
patent: 5219551 (1993-06-01), Terase et al.
patent: 5223153 (1993-06-01), Lawson et al.
Abe Eiichi
Inoue Kozo
Tsunematsu Shuji
Yamada Hideo
Japan as represented by Director General of Agency of Industrial
McCarthy Neil
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