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:
Mar. 08, 1994
Filed:
Feb. 25, 1993
Sanae Ueda, Saitama, JP;
Yoshihiro Kojima, Saitama, JP;
Makoto Nishishita, Saitama, JP;
Shinji Yamaoka, Saitama, JP;
Cosmo Research Institute, Tokyo, JP;
Cosmo Oil Co., Ltd., Tokyo, JP;
Abstract
A process for the production of an over based alkaline earth metal phenate (sulfurized, unsulfurized or a mixture thereof), in which the process comprises the steps of: effecting reactions among phenols, dihydric alcohols and an alkaline earth metal reagent (alkaline earth metal oxide or hydroxide or a mixture thereof), or among these compounds further mixed with sulfur and/or water; removing an excess of the dihydric alcohols and at least an excess of water by distillation; and subsequently treating resulting distillation residue with carbon dioxide, wherein the improvement resides in that the carbon dioxide treatment is carried out in the presence of water in an amount of from 0.01 to 1.0 mol per 1 mol of the alkaline earth metal reagent. Preferably, the carbon dioxide treatment is carried out in the presence of 0.1 to 0.7 mol sulfur and 0.1 to 1.0 mol water per 1 mol of the alkaline earth metal reagent. The process of this invention is industrially advantageous because the alkaline earth metal phenate obtained by the process has a high basicity and an easily handleable low viscosity and is useful as a high quality detergent for a lubricating or fuel oil.