Purification of phenyl ester salts

US6527690B2 · kind B2 · utility

Inventors

• Bhaskar Krishna Arumugam · Kingsport, US
• Michael E. Burns · Sharonville, US
• Dimmick L. Bymaster · Batesville, US
• Jeffrey Scott Dupont · Cincinnati, US
• Robert Richard Dykstra · Sharonville, US
• Robert Lee Eagan · Oak Lawn, US
• Eddie Eckart · Batesville, US
• Jarvey Eugene Felty, Jr. · Jonesborough, US
• Kevin John Fontenot · Jonesborough, US
• Jeffrey William Green · Batesville, US
• Shane Kipley Kirk · Church Hill, US
• Gary Paul Lutz · Church Hill, US
• Tony L. Sander · Madison, US
• Thomas Hugh Williams · Church Hill, US
• George Zima · Kingsport, US

Key dates

• Filing date: Jun 4, 2001
• Grant date: Mar 4, 2003
• Expiry date: Jun 4, 2021

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C07C303/44
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

The invention relates to a process for purifying and decolorizing a phenyl ester salt. The process combines a phenyl ester salt with a solvent to form a mixture and then stirs the mixture to form a slurry. The phenyl ester salt is substantially insoluble in this solvent. The process then collects the phenyl ester salt from the slurry. The collected phenyl ester salt may then be optionally dried or recrystallized. The collected phenyl ester salt is dissolved in a solvent to form a solution. The solution is decolorized and then spray dried to form a powder of the phenyl ester salt. As a result of the process the phenyl ester salt powder has a higher purity and an improved color as compared to the starting phenyl ester salt.