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:
Aug. 11, 1992
Filed:
Oct. 15, 1990
Istvan Greiner, Budapest, HU;
Jeno Szilbereky, Budapest, HU;
Bela Stefko, Budapest, HU;
Gyorgy Thaler, Budapest, HU;
Richter Gedeon Vegyeszeti Gyar Rt., Budapest, HU;
Abstract
A process for the dehydration of substances, mixtures, primarily condensation reaction mixtures, (e.g. direct esterification, direct acetal formation, direct ketal formation), performed by continuous azeotropic distillation with an organic solvent forming with water an azeotropic mixture of minimal boiling point and unable to mix with water, carried out in such a way that the distillate is cooled at least to the temperature, at which the condensate with the given water content or the organic phase of the condensate is just supersaturated with respect to water, and the organic phase of lower water content obtained in this way is recycled to the distilling boiler. The organic solvents used are e.g. benzene, toluene, 1,2-dichloroethane, chloroform, carbon tetrachloride.