Welcome Guest to Happi

Subscribe Free: Magazine | eNewsletter

current issue July 2015
 •  FDA Warns Pharmagel  •  The Latest Cosmetic Import Refusals  •  Aussie Unveils New 'Sh*t Girls Say About Hair' Video  •  DSM Personal Care Names New Distributor  •  ‘Keep Calm’ With Rimmel
Print

Production Method for Highly Pure Hydroquinone



Published February 4, 2013
Related Searches: form patent liquid award
Post a comment
US Patent No. 8,247,620 B2; Rhodia has been awarded a US patent covering a process for the preparation of hydroquinone starting from a crude hydroquinone HQ0.

It is comprised of a refining stage that entails cooling the crude hydroquinone in a liquid form, comprising at least resorcin and pyrogallol as impurities, to effect crystallization of the pure hydroquinone; separating the pure hydroquinone crystals from the mother liquors; reheating and partially melting the separated crystals; completely melting the purified hydroquinone; and recovering the purified hydroquinone.


blog comments powered by Disqus