PROCESS FOR PRODUCING ASCORBIC ACID IN THE PRESENCE OF A SULFIT
摘要
<p>The present invention comprises the use of sulfite additives to reduce discoloration of L-ascorbic acid produced from acid or aqueous solutions of 2-keto-L-gulonic acid. In one aspect, the present invention comprises a continuous process for producing L-ascorbic acid from an aqueous solution of 2-keto-L-gulonic acid. The use of sulfite additives reduces product stream color and improves product recovery by binding to high molecular weight reaction by-products. In a continuous process, the reaction stream is separated from residual sulfite and sulfite-bound by-products to produce a product stream enriched in aqueous ascorbic acid for recovery, and an enriched 2-keto-L-gulonic acid stream which is recycled to the reactor. The in situ use of sulfite additives during the reaction increases the overall yield of L-ascorbic acid, with no loss in selectivity of the synthesis.</p>
申请公布号
WO02051827(A1)
申请公布日期
2002.07.04
申请号
WO2001US49859
申请日期
2001.12.21
申请人
EASTMAN CHEMICAL COMPANY;ARUMUGAM, BHASKAR;COLLINS, NICK;BOYD, BRENDAN;PERRI, STEVEN;POWELL, JEFFERY;CUSHMAN, MICHAEL
发明人
ARUMUGAM, BHASKAR;COLLINS, NICK;BOYD, BRENDAN;PERRI, STEVEN;POWELL, JEFFERY;CUSHMAN, MICHAEL