Process for producing ascorbic acid
    18.
    发明授权
    Process for producing ascorbic acid 失效
    生产抗坏血酸的方法

    公开(公告)号:US06864376B2

    公开(公告)日:2005-03-08

    申请号:US10036912

    申请日:2001-12-21

    CPC classification number: C07D307/62 Y02P20/582

    Abstract: 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.

    Abstract translation: 本发明包括使用亚硫酸盐添加剂来减少由2-酮-L-古洛糖酸的酸或水溶液产生的L-抗坏血酸的变色。 一方面,本发明包括从2-酮-L-古洛糖酸的水溶液中生产L-抗坏血酸的连续方法。 使用亚硫酸盐添加剂可降低产品流颜色,并通过与高分子量反应副产物结合而提高产品回收率。 在连续方法中,将反应物流与残余的亚硫酸盐和亚硫酸盐结合的副产物分离以产生富含水溶性抗坏血酸以回收的产物流,以及富含2-酮-L-古洛糖酸流,将其再循环至 反应堆。 反应中亚硫酸盐添加剂的原位使用增加了L-抗坏血酸的总产率,合成的选择性没有损失。

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