<p>The present invention provides methods and an apparatus for the manufacture of an L-ascorbic acid product in high yield by direct conversion of an aqueous solution containing 2-keto-L-gulonic acid by contact with an acid catalyst or under thermal self-catalyzed conditions at a conversion level that maximizes the formation of L-ascorbic acid and minimizes decomposition of the L-ascorbic acid thus formed. The separation process for L-ascorbic acid and KLG is operated in such a way that an efficient separation process allows the majority of the KLG to be recycled for further conversion. The product stream from the separation process is then subjected to a recovery step to obtain crystalline L-ascorbic acid product.</p>
申请公布号
EP1351949(B1)
申请公布日期
2005.05.18
申请号
EP20010991443
申请日期
2001.12.21
申请人
EASTMAN CHEMICAL COMPANY
发明人
ARUMUGAM, BHASKAR;COLLINS, NICK;MACIAS, TRANSTIO;PERRI, STEVEN THOMAS;POWELL, JEFFERY;SINK, CHESTER;CUSHMAN, MICHAEL