Chemistry of inorganic compounds – Oxygen or compound thereof – Metal containing
Patent
1997-07-18
1999-11-23
Straub, Gary P.
Chemistry of inorganic compounds
Oxygen or compound thereof
Metal containing
423600, 423626, 423627, 501153, 502414, 502415, C01F 702, C04B 3510, B01J 2000
Patent
active
059895152
ABSTRACT:
A process for producing a stable acidic aqueous alumina sol containing 50 to 300 nm of elongate secondary particles which are elongated in only one plane and formed by edge-to-edge coagulation of rectangular plate-like primary particles having a length of one side of 10 to 30 nm when observed through an electron microscope, the process comprises the steps of:
(A) adding an alkali to an aqueous alumina sol containing fibrous colloidal particles of an amorphous alumina hydrate to produce a reaction mixture having a pH of 9 to 12,
(B) subjecting the reaction mixture obtained in the step (A) to a hydrothermal treatment at a temperature of 110 to 250.degree. C. to produce an aqueous suspension containing an alumina hydrate having a boehmite structure, and
(C) desalting the aqueous suspension obtained in the step (B) by adding water and an acid by ultrafiltration to form an acidic aqueous alumina sol having a pH of 3 to 6.
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Ema Kiyomi
Kashima Yoshiyuki
Watanabe Yoshitane
Nguyen Cam N.
Nissan Chemical Industries Ltd.
Straub Gary P.
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