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:
May. 13, 2008
Filed:
Jun. 14, 2001
Raymond Vincent Heavon Jones, Stirlingshire, GB;
Joanne Emma Murray, Stirlingshire, GB;
Jennifer Ann White, Stirlingshire, GB;
Barry Stuart Crombie, Stirlingshire, GB;
James Samuel Shane Rountree, Stirlingshire, GB;
Jacqueline Ann Campbell, Stirlingshire, GB;
Raymond Vincent Heavon Jones, Stirlingshire, GB;
Joanne Emma Murray, Stirlingshire, GB;
Jennifer Ann White, Stirlingshire, GB;
Barry Stuart Crombie, Stirlingshire, GB;
James Samuel Shane Rountree, Stirlingshire, GB;
Jacqueline Ann Campbell, Stirlingshire, GB;
Syngenta Limited, , GB;
Abstract
A process for extracting from aqueous solution the alkali metal or ammonium salt of a phenol, naphthol, anthrol or phenanthrol or the corresponding thiol, which comprises contacting an aqueous alkaline or neutral solution of the alkali metal or ammonium salt, in which is dissolved an alkali metal or ammonium fluoride, chloride, bromide, hydroxide, nitrate, nitrite, sulphate, sulphite, sulphide, thiosulphate, phosphate, hydrogen phosphate, carbonate, bicarbonate, cyanate, cyanide, thiocyanate, borate, chlorate, chlorite, hypochlorite, perchlorate, chromate, dichromate or permanganate, with a partially water-miscible organic solvent so as to transfer aqueous solution of the alkali metal or ammonium salt of the phenol, naphthol, anthrol or phenanthrol or corresponding thiol into the solvent while retaining separate aqueous and solvent phases, and thereafter separating the solvent phase containing the alkali metal or ammonium salt and water from the aqueous phase, the ratio of solvent to water in the separated solvent phase being from 0.5:1 to 10:1 w/w.