Method for the production of 2=-keto-l-gulonic acid C4C10 alkyl esters
    2.
    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

    CPC classification number: C07H7/027 Y02P20/127

    Abstract: 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.

    Abstract translation: 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
    9.
    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

    CPC classification number: C07H7/027 Y02P20/127

    Abstract: 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.

    Abstract translation: 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。

    Hydrogenation of nitriles over Raney catalysts
    10.
    发明授权
    Hydrogenation of nitriles over Raney catalysts 失效
    在阮内催化剂上氢化腈

    公开(公告)号:US06677486B2

    公开(公告)日:2004-01-13

    申请号:US09985982

    申请日:2001-11-07

    Abstract: Nitriles are hydrogenated to primary amines over an activated, alpha-Al2O3-containing, macroporous Raney catalyst based on an alloy of aluminum and at least one transition metal selected from the group consisting of iron, cobalt and nickel, and, if desired, one or more further transition metals selected from the group consisting of titanium, zirconium, chromium and manganese, which is obtainable by a process comprising the steps in the order (a)-(f): (a) preparing a kneadable composition comprising the alloy, a shaping aid, water and a pore former; (b) shaping the kneadable composition to form a shaped body; (c) calcining the shaped body; (d) activating the calcined shaped body by treatment with aqueous alkali metal hydroxide solution; (e) rinsing the shaped catalyst body with aqueous alkali metal hydroxide solution; (f) rinsing the shaped catalyst body with water.

    Abstract translation: 基于铝和至少一种选自铁,钴和镍的过渡金属的合金,并且如果需要,腈在一种活化的含α-Al 2 O 3的大孔阮内催化剂上氢化成伯胺,如果需要, (a) - (f):(a)制备包含该合金的可捏合组合物的方法可以获得更多的选自钛,锆,铬和锰的过渡金属, 成型助剂,水和成孔剂;(b)使捏合组合物成形以形成成形体;(c)煅烧成形体;(d)用碱金属氢氧化物水溶液处理活化煅烧成形体;(e) 用碱金属氢氧化物水溶液冲洗成型的催化剂体;(f)用水冲洗成型的催化剂体。

Patent Agency Ranking