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23 条记录 (耗时 0.022 秒)

    Preparation of 2-vinylimidazoles by dehydrogenation of 2-ethylimidazoles and 2-ethylimidazolines
    3.
    发明授权
    Preparation of 2-vinylimidazoles by dehydrogenation of 2-ethylimidazoles and 2-ethylimidazolines 失效
    通过2-乙基咪唑和2-乙基咪唑啉的脱氢制备2-乙烯基咪唑

    公开(公告)号：US4410706A

    公开(公告)日：1983-10-18

    申请号：US379608

    申请日：1982-05-19

    申请人： Alan S. Rothenberg ,  Hans P. Panzer ,  Joseph L. Schmitt ,  Roger J. Card

    发明人： Alan S. Rothenberg ,  Hans P. Panzer ,  Joseph L. Schmitt ,  Roger J. Card

    IPC分类号： C07D233/54 ,  C07D233/58

    CPC分类号： C07D233/56

    摘要： A method for preparing 2-alkenylimidazoles from readily available 2-alkylimidazoles or 2-alkylimidazolines by dehydrogenating the 2-alkylimidazole or 2-alkylimidazoline in the presence of a suitable dehydrogenation catalyst. The preferred method provides 2-vinylimidazole by dehydrogenating 2-ethylimidazole or 2-ethylimidazoline. The reaction is advantageously carried out in a vapor phase in the presence of an inert carrier gas using as preferred dehydrogenation catalysts, copper chromites and catalysts comprising one or more of the metals molybdenum, iron, cobalt, zinc or chromium on non-reducible oxide supports such as alumina or silica.

    摘要翻译： 一种通过在合适的脱氢催化剂存在下使2-烷基咪唑或2-烷基咪唑啉脱氢制备2-链烯基咪唑从易得的2-烷基咪唑或2-烷基咪唑衍生的方法。 优选的方法通过使2-乙基咪唑或2-乙基咪唑啉脱氢而提供2-乙烯基咪唑。 反应有利地在惰性载体存在下，使用优选的脱氢催化剂，在含有不可还原氧化物载体上的一种或多种金属钼，铁，钴，锌或铬中的一种或多种金属铬和催化剂在气相中进行 例如氧化铝或二氧化硅。

    Iron ore beneficiation by selective flocculation
    8.
    发明授权
    Iron ore beneficiation by selective flocculation 失效
    铁矿选矿选矿絮凝

    公开(公告)号：US4274945A

    公开(公告)日：1981-06-23

    申请号：US92002

    申请日：1979-11-07

    申请人： Richard M. Goodman ,  Hans P. Panzer

    发明人： Richard M. Goodman ,  Hans P. Panzer

    IPC分类号： B03D3/06 ,  C02F1/54 ,  B03B1/04

    CPC分类号： B03D3/06 ,  C02F1/54

    摘要： Selective flocculation of iron ores is accomplished through the employment of partially carboxylated polyacrylamides as the selective flocculant. The partially carboxylated polyacrylamides employed in the selective flocculation contain from about 20-65% carboxyl groups and are of a molecular weight in excess of one million. The selective flocculation process performs a separation of iron ores predominantly containing semitaconite, oxidized taconite and hematitic-goethitic jaspers from their associated siliceous gangue.

    摘要翻译： 铁矿石的选择性絮凝是通过使用部分羧化的聚丙烯酰胺作为选择性絮凝剂来实现的。 在选择性絮凝中使用的部分羧化的聚丙烯酰胺含有约20-65％的羧基，分子量超过一百万。 选择性絮凝过程主要从其相关的硅质ang石中分离出铁矿石，其主要含有半石灰，氧化铁白石和血细胞 - 羟乙基堇青石。