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:
Dec. 24, 2002
Filed:
Jun. 01, 2001
Kevin J. Fontenot, Kingsport, TN (US);
David C. Attride, Jonesborough, TN (US);
Keith B. Terhune, Batesville, AR (US);
Eastman Chemical Company, Kingsport, TN (US);
Abstract
The invention relates to a process for isolating a phenyl ester salt from a mixture comprising sulfolane (tetrahydrothiophene-1,1-dioxide). The invention includes adjusting the temperature of a mixture comprising a phenyl ester salt and sulfolane to a temperature of about 100-150° C. This step leads to the formation of a mixture comprising a solid phenyl ester salt and sulfolane. Next, the solid phenyl ester salt is separated, while maintaining the temperature of the mixture at about 100-150° C. The invention also relates to a process that includes adding a sufficient amount of a solvent to a mixture comprising a phenyl ester salt and sulfolane to decrease the viscosity or the density of the mixture. The solvent added has a density less than about 1.20 g/cm at 100° C. or a viscosity of less than about 2.56 centipoise at 100° C. The embodiments of the invention may be used alone or in combination. This invention may be used for the isolation of a variety of phenyl ester salts, including but not limited to sodium 4-sulfophenyl-6-[(1-oxynonyl)amino]hexanoate, sodium 4-(nonanoyloxy) benzenesulfonate, and sodium benzoyloxybenzenesulphonate.