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:
Jul. 01, 2003
Filed:
Mar. 20, 2002
Phillip L. Mattison, Cincinnati, OH (US);
Patrick M. McCurry, Jr., West Chester, OH (US);
Cognis Corporation, Gulph Mills, PA (US);
Abstract
Quaternary ammonium dihydrogen phosphate or bisulfate salts are made by a process comprising the steps of: (1) forming a first mixture by contacting a quaternary ammonium halide with: (a) a water-insoluble organic solvent capable of forming a ternary azeotrope with water and hydrogen halide and (b) an amount of water and sulfuric acid or phosphoric acid sufficient to maintain the temperature of the first mixture in the range of from about 98° C. to about 105° C. when heated; (2) heating the first mixture to a temperature sufficient to separate a ternary azeotrope comprised of hydrogen halide, water and the water-insoluble organic solvent from the first mixture to form a second mixture comprised of water, sulfuric acid or phosphoric acid, the water-insoluble organic solvent and a quaternary ammonium dihydrogen phosphate or bisulfate salt. The process is less time-consuming, less labor intensive, and utilizes relatively small amounts of materials thereby resulting in cost and effluent disposal savings when compared to known methods.