The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jan. 16, 2001
Filed:
May. 06, 1999
Takayuki Tsukada, Toda, JP;
Hiroyuki Nakamura, Toda, JP;
Japan Energy Corporation, Tokyo, JP;
Abstract
An aluminum salt solution and an alkali aluminate solution are subjected to a neutralization reaction to precipitate and form a pseudo-boehmite powder. The neutralization reaction is performed under a condition in which the reaction temperature is within a range of 55 to 71° C., pH is within a range of 8.5 to 9.5, and the solution feed time is within a range of 7 to 25 minutes. The obtained pseudo-boehmite is as follows. That is, the pore volume concerning pores having a pore diameter ranging from 20 to 600 Å is within a range of 0.8 to 1.8 cc/g as measured by the nitrogen adsorption method, and the maximum value of variation ratio dV/dD of the pore volume with respect to the pore diameter as measured by the BJH method is not more than 0.018 cc/g•Å. When the pseudo-boehmite is used, it is possible to produce a catalyst carrier for hydrogenation refining, which has a sharp pore diameter distribution and which suffers less decrease in strength upon impregnation with a catalyst solution.