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23 条记录 (耗时 0.017 秒)

    Cryogenic process for producing low-purity oxygen
    3.
    发明授权
    Cryogenic process for producing low-purity oxygen 失效
    用于生产低纯氧的低温工艺

    公开(公告)号：US4947649A

    公开(公告)日：1990-08-14

    申请号：US337518

    申请日：1989-04-13

    申请人： Rakesh Agrawal ,  Steven R. Auvil

    发明人： Rakesh Agrawal ,  Steven R. Auvil

    IPC分类号： F25J3/04

    CPC分类号： F25J3/044 ,  F25J3/04193 ,  F25J3/042 ,  F25J3/04296 ,  F25J3/04351 ,  F25J2200/40 ,  F25J2200/76 ,  F25J2215/50 ,  F25J2250/20 ,  Y10S62/939

    摘要： This invention relates to an improved cryogenic separation process employing a single pressure distillation column for the recovery of low purity, high pressure oxygen. The process uses two working fluids, i.e., high pressure air and high pressure nitrogen to effect reboil in the column. Both the condensed air and nitrogen streams are fed as reflux streams to the distillation column. The use of nitrogen reflux enhances oxygen recovery by enhancing purity of the nitrogen from the column.

    摘要翻译： 本发明涉及采用单一压力蒸馏塔来回收低纯度高压氧气的改进的低温分离方法。 该方法使用两种工作流体，即高压空气和高压氮气以在塔中实现再沸腾。 冷凝的空气和氮气流都作为回流流进入蒸馏塔。 氮回流的使用通过提高柱的氮的纯度来提高氧气回收率。

    Process for the production of argon
    4.
    发明授权
    Process for the production of argon 失效
    氩气生产工艺

    公开(公告)号：US4817392A

    公开(公告)日：1989-04-04

    申请号：US79187

    申请日：1987-07-29

    申请人： Rakesh Agrawal ,  Steven R. Auvil ,  Jung S. Choe

    发明人： Rakesh Agrawal ,  Steven R. Auvil ,  Jung S. Choe

    IPC分类号： B01D53/22 ,  C01B23/00 ,  F25J3/04 ,  F25J3/00

    CPC分类号： B01D53/229 ,  C01B23/00 ,  F25J3/04648 ,  F25J2205/02 ,  F25J2205/40 ,  F25J2205/60 ,  F25J2205/80 ,  F25J2205/82 ,  F25J2245/50

    摘要： The present invention is a process for the production and recovery of an O.sub.2 -lean argon stream from a gas mixture containing argon and oxygen. The argon-containing gas mixture is initially treated in a cryogenic separation unit to produce a crude argon stream having an argon concentration between 80-98%. The crude argon stream is passed to a membrane separation unit where it is separated to produce an O.sub.2 -lean argon stream and an O.sub.2 - rich stream. The O.sub.2 -rich stream is recycled tothe cryogenic separation unit and the O.sub.2 -lean argon stream is recovered as product or futher purified.

    摘要翻译： 本发明是一种从含有氩气和氧气的气体混合物生产和回收贫氧氩气流的方法。 首先在低温分离单元中处理含氩气体混合物以产生氩浓度在80-98％之间的粗氩气流。 将粗氩气流输送到膜分离单元，在其中分离，以产生贫氧的氩气流和富O2的气流。 将富O2的物流再循环到低温分离装置中，并将贫O2的氩气流作为产物回收或进一步纯化。

    Alkylation of aromatic amines with olefins on partially dealuminated zeolites
    7.
    发明授权
    Alkylation of aromatic amines with olefins on partially dealuminated zeolites 失效
    芳烃与烯烃在部分脱铝沸石上烷基化

    公开(公告)号：US4876377A

    公开(公告)日：1989-10-24

    申请号：US171602

    申请日：1988-03-22

    申请人： Rakesh Agrawal ,  Steven R. Auvil ,  Michel Deeba

    发明人： Rakesh Agrawal ,  Steven R. Auvil ,  Michel Deeba

    IPC分类号： C07C209/68

    CPC分类号： C07C209/68 ,  B01J2229/16

    摘要： This invention pertains to an improved process for the alkylation of aromatic amines. The improvement resides in the use with particular aromatic amines and olefins a catalyst which is a highly acidic partially dealuminated zeolite having an increased silica to alumina molar ratio over the original zeolite and an acidity factor of at least 0.3. The partially dealuminated zeolites are preferably exchanged with hydrogen or rare earth metal and are particularly effective for producing an alkylated aromatic amine where the alkyl group is ortho to the amine. The highly acidic partially dealuminated H-mordenite and partially dealuminated HY faujasite are very effective for the alkylation of aniline with propylene.

    摘要翻译： 本发明涉及芳族胺的烷基化改进方法。 改进在于与特定的芳族胺和烯烃一起使用催化剂，催化剂是与原沸石相比具有增加的二氧化硅与氧化铝摩尔比并且酸度因子至少为0.3的高度酸性部分脱铝的沸石。 部分脱铝的沸石优选与氢或稀土金属交换，并且对于制备其中烷基是胺的邻位的烷基化芳族胺特别有效。 高度酸性的部分脱铝的H-丝光沸石和部分脱铝的HY八面沸石对于用丙烯烷基化苯胺非常有效。

    Alkylation of aromatic amines over thermally pretreated zeolites
    10.
    发明授权
    Alkylation of aromatic amines over thermally pretreated zeolites 失效
    芳族胺在热预处理沸石上烷基化

    公开(公告)号：US5026912A

    公开(公告)日：1991-06-25

    申请号：US499925

    申请日：1990-03-27

    申请人： Rakesh Agrawal ,  Steven R. Auvil

    发明人： Rakesh Agrawal ,  Steven R. Auvil

    IPC分类号： C07C209/68

    CPC分类号： C07C209/68

    摘要： A process for selectively producing ortho-alkylated aromatic amines in high selectivity relative to N-alkylated aromatic amines. The process comprises reacting an aromatic amine, having at least one hydrogen atom in a position ortho to the amine functionality, and an olefin under conditions sufficient to effect an alkylation reaction, in the presence of a zeolite catalyst which has been thermally pretreated by heating the catalyst to a temperature greater than about 500.degree. C. for a period ranging from 0.5 to about 10 hours while sweeping an inert gas over the heated catalyst to remove water and ammonia formed during the thermal treatment, and subsequently recovering the alkylated aromatic amine.

    摘要翻译： 相对于N-烷基化芳族胺，以高选择性选择性地生产邻烷基化芳族胺的方法。 该方法包括在已经通过加热热预处理的沸石催化剂的存在下使具有至少一个氢原子的胺在官能团的位置与烯烃的反应条件下进行反应，所述烯烃在足以进行烷基化反应的条件下进行 催化剂在大约500℃的温度下进行约0.5至约10小时的时间，同时在加热的催化剂上吹扫惰性气体以除去在热处理期间形成的水和氨，随后回收烷基化芳族胺。