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:
Jun. 22, 1999
Filed:
Mar. 02, 1998
Christian Sidot, Compiegne, FR;
Clariant (France) S. A., Puteaux, FR;
Abstract
In an industrial process for the manufacture of sodium orthohydroxymandelate by condensation of phenol in an inert atmosphere with glyoxylic acid in aqueous solution, in the presence of a tertiary amine and of catalytic quantities of a trivalent metal cation at a temperature below 100.degree. C., carried out continuously in at least two reactors (R1 . . . Rn) installed in series, the first being supplied by a first tank C1 containing the glyoxylic acid and the trivalent metal cations, and a second tank C2 containing the phenol and the tertiary amine, the reaction medium obtained at the outlet of the last of the at least two reactors and consisting of an aqueous phase and an organic phase is transferred into the first of two mixer-decanters (MD1 and MD2) installed in series, the aqueous phase of the first mixer-decanter MD1 is recovered in order to extract the expected sodium orthohydroxymandelate from it, while the organic phase that has come from MD1 is transferred into the second mixer-decanter MD2 and washed with water, and the organic phase of the second mixer-decanter MD2 is transferred to the second tank (C2).