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23 条记录 (耗时 0.009 秒)

    Stable polyisocyanates and process therefor
    4.
    发明授权
    Stable polyisocyanates and process therefor 失效
    稳定的多异氰酸酯及其工艺

    公开(公告)号：US3919218A

    公开(公告)日：1975-11-11

    申请号：US47172374

    申请日：1974-05-20

    申请人： VEBA CHEMIE AG

    发明人： SCHMITT KARL ,  DISTELDORF JOSEF ,  SCHMITT FELIX

    IPC分类号： C07D251/34 ,  C08G18/00 ,  C08G18/02 ,  C07D251/04

    CPC分类号： C08G18/022

    摘要： or

    WHEREIN R is

    Isocyanato isocyanurate solutions are prepared by the trimerization of aliphatic or cycloaliphatic isocyanates with aziridine or its derivatives as catalyst and trialkylamines with 1-5 carbon atoms in the alkyl groups as co-catalyst in the presence or absence of organic solvents and terminating the polymerization by destroying said catalyst by thermic treatment at temperatures between 80* and 200*C, and simultaneously or subsequently separating said co-catalyst by distillation. Isocyanato isocyanurates having the formula

    摘要翻译： 异氰酸酯异氰脲酸酯溶液通过脂族或脂环族异氰酸酯与氮丙啶或其衍生物作为催化剂三烷基化，烷基中具有1-5个碳原子的三烷基胺作为助催化剂，在有机溶剂存在或不存在下终止聚合反应 所述催化剂通过在80至200℃的温度下进行热处理，同时或随后通过蒸馏分离所述助催化剂。

    Method for the catalytic hydration of olefins
    5.
    发明授权
    Method for the catalytic hydration of olefins 失效
    烯烃催化水合方法

    公开(公告)号：US3898290A

    公开(公告)日：1975-08-05

    申请号：US20158671

    申请日：1971-11-23

    申请人： VEBA CHEMIE AG

    发明人： ESTER WILHELM

    IPC分类号： C07C29/08

    CPC分类号： C07C29/08 ,  C07C31/08

    摘要： In the vapor phase hydration of olefin to produce the corresponding alcohol employing phosphoric acid as a catalyst, the catalyst being on a catalyst support, wherein liquid phosphoric acid is entrained by the vapor withdrawn from the reaction zone, liquid phosphoric acid is removed from the lastmentioned vapor and returned to the reaction zone.

    摘要翻译： 在使用磷酸作为催化剂制备相应的醇的气相水合中，催化剂在催化剂载体上，其中液体磷酸被从反应区抽出的蒸气夹带，液体磷酸从最后的 并且返回到反应区。

    Preparation of aromatic dinitriles
    6.
    发明授权
    Preparation of aromatic dinitriles 失效
    芳香族二腈的制备

    公开(公告)号：US3870743A

    公开(公告)日：1975-03-11

    申请号：US4787570

    申请日：1970-06-17

    申请人： VEBA CHEMIE AG

    发明人： IBING GUENTHER ,  NEUBOLD KURT

    IPC分类号： B01J23/28 ,  C07C20060101 ,  C07C255/51 ,  C07C121/02 ,  C07C121/54

    CPC分类号： C07C253/28 ,  C07C255/51

    摘要： In the production of nitriles of aromatic dicarboxylic acids by the reaction of alkyl-substituted benzenes with oxygen and ammonia at elevated temperatures, the improvement which comprises employing as catalyst a mixture of vanadium and molybdenum oxides on an alumina carrier, which has been activated by a compound of at least one of cerium, chromium, manganese, tungsten, bismuth, tin, antimony, titanium, lithium, sodium and potassium.

    摘要翻译： 在通过烷基取代的苯与氧和氨在升高的温度下反应生产芳族二羧酸的腈时，其改进包括在氧化铝载体上使用钒和钼氧化物的混合物作为催化剂，氧化铝载体已被 铈，铬，锰，钨，铋，锡，锑，钛，锂，钠和钾中的至少一种的化合物。

    Glyoxal hemiacetals, their preparation and use
    9.
    发明授权
    Glyoxal hemiacetals, their preparation and use 失效
    乙二醛半缩醛，其制备和用途

    公开(公告)号：US3897503A

    公开(公告)日：1975-07-29

    申请号：US31049172

    申请日：1972-11-29

    申请人： VEBA CHEMIE AG

    发明人： WESSENDORF RICHARD ,  HEITMANN WILHELM

    IPC分类号： C07C43/317 ,  C07C41/00 ,  C07C41/34 ,  C07C43/00 ,  C07C43/30 ,  C07C45/00 ,  C07C47/00 ,  C07C47/12 ,  C07C67/00 ,  C07D321/00

    CPC分类号： C10M2217/00

    摘要： The invention provides substantially pure glyoxal hemiacetals of the formula

    wherein each R in an alkyl radical of 4 to about 36 carbon atoms or together are an Alpha , omega -alkylene radical of 4 to about 36 carbon atoms. They are prepared by reacting the corresponding alkanol or Alpha , omega -alkylene glycol with an aqueous solution of glyoxal of about 2 to 80% concentration by weight; the glyoxal solution may be the impure crude oxidation product of ethylene or acetaldehyde with aqueous nitric acid. The hemiacetal separates from the aqueous solution in which it was prepared and may be reconverted to glyoxal, by heating in the presence or absence of water, the glyoxal having thereby been purified.

    摘要翻译： 本发明提供了式HOOH ANGLE CH-CH ANGLE ROOR的基本上纯的乙二醛半缩醛，其中4至约36个碳原子的烷基中的每个R或一起是4至约36个碳原子的α，ω-亚烷基。 它们通过使相应的链烷醇或α，ω-亚烷基二醇与乙二醛的水溶液反应制备，乙二醛浓度为约2-80％ 乙二醛溶液可能是乙烯或乙醛与硝酸水溶液不纯的粗氧化产物。 半缩醛与其制备的水溶液分离，可以通过在存在或不存在水的情况下加热而再转化为乙二醛，从而将乙二醛纯化。

    Recovery of citraconic acid anhydride by isomerization and vacuum distillation
    10.
    发明授权
    Recovery of citraconic acid anhydride by isomerization and vacuum distillation 失效
    通过异构化和真空蒸馏回收柠康酸酐

    公开(公告)号：US3865696A

    公开(公告)日：1975-02-11

    申请号：US19673171

    申请日：1971-11-08

    申请人： VEBA CHEMIE AG

    发明人： IBING GUNTHER ,  HAFERKORN HERBERT

    IPC分类号： C07C51/487 ,  B01D3/36 ,  C07C57/02

    CPC分类号： C07C51/487 ,  C07C57/155

    摘要： Citraconic acid anhydride is recovered from an aqueous solution containing citraconic and maleic acids by first isomerizing the maleic acid and removing the resulting solid fumaric acid. The filtrate is vacuum distilled to remove 80 - 90 percent of the water at a sump temperature of less than 80*C. The concentrated solution is then further vacuum distilled at a sump temperature greater than 80*C, preferably greater than 100*C, and an anhydride/water mixture is recovered overhead from which the anhydride product is separated.

    摘要翻译： 通过首先使马来酸异构化并除去所得的固体富马酸，从包含柠康和马来酸的水溶液中回收柠康酸酐。 在低于80℃的贮槽温度下，将滤液真空蒸馏除去80-90％的水。然后将浓缩的溶液在大于80℃，优选大于100℃的贮槽温度下进一步真空蒸馏， 并从其中分离酸酐产物的顶部回收酸酐/水混合物。