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:
Jun. 23, 2009
Filed:
Dec. 25, 2003
Shinji Suzuki, Tokyo, JP;
Yoshihito Okubo, Ibaraki, JP;
Shinji Suzuki, Tokyo, JP;
Yoshihito Okubo, Ibaraki, JP;
Sumitomo Chemical Company Limited, Tokyo, JP;
Abstract
The present invention is a method which is capable of producing crystals having a mean particle diameter larger than conventionally produced crystals, by carrying out a crystallizing method so-called neutralization crystallization. An ingredient organic acid salt solution is supplied as a reaction initial liquid in a reaction vessel (). An acid is supplied via a dropping tube () to the ingredient organic acid salt solution, so that crystals of a targeted organic acid is precipitated. Then, the base is supplied in the reaction vessel () via a dropping tube (), thereby partially dissolving the crystals being precipitated. The acid is further supplied from the dropping tube () for carrying out the crystallization.