Method for the production of 2=-keto-l-gulonic acid C4C10 alkyl esters
    5.
    发明授权
    Method for the production of 2=-keto-l-gulonic acid C4C10 alkyl esters 失效
    制备2 =酮-1-古洛糖酸C 4 C 10烷基酯的方法

    公开(公告)号:US07091375B2

    公开(公告)日:2006-08-15

    申请号:US10534334

    申请日:2003-11-07

    IPC分类号: C07D305/12

    CPC分类号: C07H7/027 Y02P20/127

    摘要: The invention relates to a method for producing 2-keto-L-gulonic acid-C4–C10 alkyl ester by esterifying 2-keto-L-gulonic acid (KGS) with an unsaturated, branched or unbranched C4–C10 alcohol. The inventive method is characterized by the fact that an aqueous KGS solution is reacted with a C4–C10 alcohol up to an esterification degree of 20 to 70 percent in a pre-esterification process carried out under acidic catalysis conditions; and the obtained product is dehydrogenated with an unsaturated, branched or unbranched C4–C10 alcohol in a continuous rectification device, whereby the esterification reaction continues, n-butanol preferably being used as the alkyl alcohol. In a preferred embodiment, the aqueous KGS solution is concentrated up to or beyond the limit of solubility prior to the esterification process, preferably by catalyzing a homogeneous or heterogeneous catalyst, especially sulfonic acid, at temperatures of 50 to 120° C. In another embodiment, the produced KGS ester is reacted in one or several additional steps so as to obtain L-ascorbic acid.

    摘要翻译: 本发明涉及通过酯化2-酮-L-古洛糖酸(KGS)制备2-酮-L-古洛糖酸-C 4 -C 10烷基酯的方法 )与不饱和,支链或非支链C 4 -C 10醇。 本发明的方法的特征在于,将KGS水溶液与C 4 -C 10 - 醇反应,直到酯化程度为20至70% 在酸性催化条件下进行酯化过程; 并将得到的产物用连续精馏装置中的不饱和支链或非支链C 4 -C 10醇脱氢,由此继续进行酯化反应,正丁醇优选为 用作烷基醇。 在优选的实施方案中,在酯化过程之前,优选通过在50至120℃的温度下催化均相或多相催化剂,特别是磺酸,将KGS水溶液浓缩至或超过溶解度的极限。在另一个实施方案中 ,所制备的KGS酯在一个或几个附加步骤中反应,以获得L-抗坏血酸。

    Method for the production of 2 =-keto-l-gulonic acid c4-c10 alkyl esters
    7.
    发明申请
    Method for the production of 2 =-keto-l-gulonic acid c4-c10 alkyl esters 失效
    制备2 =酮-1-古洛糖酸c4-c10烷基酯的方法

    公开(公告)号:US20060058550A1

    公开(公告)日:2006-03-16

    申请号:US10534334

    申请日:2003-11-07

    IPC分类号: C07C69/66

    CPC分类号: C07H7/027 Y02P20/127

    摘要: The invention relates to a method for producing 2-keto-L-gulonic acid-C4-C10 alkyl ester by esterifying 2-keto-L-gulonic acid (KGS) with an unsaturated, branched or unbranched C4-C10 alcohol. The inventive method is characterized by the fact that an aqueous KGS solution is reacted with a C4-C10 alcohol up to an esterification degree of 20 to 70 percent in a pre-esterification process carried out under acidic catalysis conditions; and the obtained product is dehydrogenated with an unsaturated, branched or unbranched C4-C10 alcohol in a continuous rectification device, whereby the esterification reaction continues, n-butanol preferably being used as the alkyl alcohol. In a preferred embodiment, the aqueous KGS solution is concentrated up to or beyond the limit of solubility prior to the esterification process, preferably by catalyzing a homogeneous or heterogeneous catalyst, especially sulfonic acid, at temperatures of 50 to 120 ° C. In another embodiment, the produced KGS ester is reacted in one or several additional steps so as to obtain L-ascorbic acid.

    摘要翻译: 本发明涉及通过酯化2-酮-L-古洛糖酸(KGS)制备2-酮-L-古洛糖酸-C 4 -C 10烷基酯的方法 )与不饱和,支链或非支链C 4 -C 10醇。 本发明的方法的特征在于,将KGS水溶液与C 4 -C 10 - 醇反应,直到酯化程度为20至70% 在酸性催化条件下进行酯化过程; 并将得到的产物用连续精馏装置中的不饱和支链或非支链C 4 -C 10醇脱氢,由此继续进行酯化反应,正丁醇优选为 用作烷基醇。 在优选的实施方案中,在酯化过程之前,优选通过在50至120℃的温度下催化均相或多相催化剂,特别是磺酸,将KGS水溶液浓缩至或超过溶解度的极限。在另一个实施方案中 ,所制备的KGS酯在一个或几个附加步骤中反应,以获得L-抗坏血酸。

    Removal of riboflavin from fermentation suspensions
    9.
    发明授权
    Removal of riboflavin from fermentation suspensions 失效
    从发酵悬浮液中除去RIBOFLAVIN

    公开(公告)号:US5169759A

    公开(公告)日:1992-12-08

    申请号:US644609

    申请日:1991-01-23

    CPC分类号: C12P25/00

    摘要: Riboflavin is removed from fermentation suspensions by them being heated at from 50.degree. to 90.degree. C. for from 1 to 3 hours, than cooled to from 0.degree. to 30.degree. C. over a period of from 1 to 5 hours, and subsequently being centrifuged to give a sediment fraction and liquid fraction in such a way that the sediment fraction contains predominantly riboflavin crystals as solid, and the liquid fraction contains virtually no crystalline riboflavin, and, where appropriate, resuspending the sediment fraction in from 0.5 to 2 parts by volume of water per part by volume of sediment fraction and repeating procedure c.

    摘要翻译: 将核黄素从发酵悬浮液中除去,在50〜90℃下加热1〜3小时,冷却至0〜30℃,时间为1〜5小时,随后为 离心分离以得到沉淀物部分和液体部分,使得沉淀物部分主要含有核黄素晶体作为固体,并且液体部分几乎不含结晶核黄素,并且在适当情况下将沉降物组分重悬于0.5至2份中 每部分体积的沉淀物含量的水量和重复程序c。