Welcome Guest to Happi

Subscribe Free: Magazine | eNewsletter

current issue July 2015
 •  Girl On Film: Le Bon Newest Face for Redken  •  Board of Trustee News at ISBN  •  Mouthwash Is Recalled  •  L’Occitane Teams Up With Glamsquad  •  Zapne Introduces Natural Acne Treatment
Print

Production Method for Highly Pure Hydroquinone



Published February 4, 2013
Related Searches: liquid award form patent
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