EP 2069277 A1 20090617 - PROCESS FOR THE PREPARATION OF HIGHLY PURE HYDROQUINONE
Title (en)
PROCESS FOR THE PREPARATION OF HIGHLY PURE HYDROQUINONE
Title (de)
VERFAHREN ZUR HERSTELLUNG VON HOCHREINEM HYDROCHINON
Title (fr)
PROCEDE DE PREPARATION D'HYDROQUINONE DE PURETE ELEVEE
Publication
Application
Priority
- FR 2007001424 W 20070903
- FR 0607730 A 20060904
Abstract (en)
[origin: WO2008029018A1] The present invention relates to a process for preparing highly pure hydroquinone freed of the impurities resulting from its preparation process. The process of the invention is characterized in that it comprises at least the following steps: a) the crude hydroquinone, in a liquid form and comprising at least resorcine and pyrogallol as an impurity, is subjected to a controlled cooling ensuring the crystallisation of the pure hydroquinone, b) the pure hydroquinone crystals are separated from the mother liquors, c) heating and partial melting is carried out, d) the purified hydroquinone is entirely melted, and e) the purified hydroquinone is recovered.
IPC 8 full level
C07C 37/84 (2006.01); C07C 39/08 (2006.01)
CPC (source: EP US)
C07C 37/84 (2013.01 - EP US)
Citation (search report)
See references of WO 2008029018A1
Designated contracting state (EPC)
AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IS IT LI LT LU LV MC MT NL PL PT RO SE SI SK TR
Designated extension state (EPC)
AL BA HR MK RS
DOCDB simple family (publication)
FR 2905374 A1 20080307; FR 2905374 B1 20081114; EP 2069277 A1 20090617; JP 2010502684 A 20100128; NO 20090956 L 20090604; US 2010152495 A1 20100617; US 8247620 B2 20120821; WO 2008029018 A1 20080313
DOCDB simple family (application)
FR 0607730 A 20060904; EP 07823468 A 20070903; FR 2007001424 W 20070903; JP 2009527175 A 20070903; NO 20090956 A 20090302; US 31066107 A 20070903