Texaco Inc.

Chevron U.s.a. Inc.

Leonard S Bartley, Jr

Regis J Pellet

Brian L Papke

Paul M Van De Ven

The invention includes, in one embodiment, a method for determining the presence or absence of a corrosion-inhibitory level of carboxylate anion in used engine coolant which includes: obtaining a known quantity of the engine coolant as a representative sample thereof, the sample containing a level of carboxylate anion to be determined; adding a fixed quantity of an aluminum containing color indicator to the sample, where the color of the aluminum color indicator is different from the original color of the sample, thereby changing the color of the sample to substantially the color of the aluminum color indicator, where at least a portion of the aluminum color indicator complexes with at least a portion of the carboxylate anion to form a colored insoluble aluminum-carboxylate complex, where the colored insoluble aluminum-carboxylate complex precipitates, and where the color of the sample remains substantially the color of the aluminum color indicator when the level of carboxylate anion therein is below an effective corrosion-inhibitory amount and where the color of the sample returns substantially to the original color of the sample when the level of carboxylate anion is at an effective corrosion-inhibitory amount; and observing the color of the sample.

Test kit for measuring the level of carboxylate anion in engine coolant

A colorimetric method is provided for determining the presence or absence of a corrosion-inhibitory level of carboxylate anion in used aqueous engine coolant.

A calorimetric method is provided for determining the presence or absence of a corrosion-inhibitory level of carboxylate anion in used aqueous engine coolant.

Method for measuring the level of carboxylate anion in engine coolant

An improvement is provided in a process for making a calcium sulfonate wherein a calcium base/calcium sulfonate mixture is mixed, stirred, reacted with CO.sub.2, and filtered to produce the sulfonate product. The improvement comprises stirring the calcium base/calcium sulfonate mixture at variable speeds over a sufficient length of time, whereby the product's filterability is enhanced and viscosity reduced.

Process for producing an overbased sulfonate

A method of preparing a amorphous metal sulfonate detergent for lubricants. The sulfonate detergent is prepared by:

Growing community of inventors

Newburgh, NY, United States of America

Leonard S Bartley, Jr