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17 条记录 (耗时 0.02 秒)

    Method for Removing N2O and NOx From the Nitric Acid Production Process, and an Installation Suitable for Same
    2.
    发明申请
    Method for Removing N2O and NOx From the Nitric Acid Production Process, and an Installation Suitable for Same 有权
    从硝酸生产过程中去除N2O和NOx的方法及适用于其的安装方法

    公开(公告)号：US20130336872A1

    公开(公告)日：2013-12-19

    申请号：US13984921

    申请日：2012-02-14

    申请人： Meinhard Schwefer ,  Rolf Siefert ,  Jürgen Fuchs ,  Klaus Ruthardt ,  Michael Groves

    发明人： Meinhard Schwefer ,  Rolf Siefert ,  Jürgen Fuchs ,  Klaus Ruthardt ,  Michael Groves

    IPC分类号： C01B21/40

    CPC分类号： C01B21/40 ,  B01D53/8628 ,  B01D53/869 ,  B01D2255/2065 ,  B01D2255/20738 ,  B01D2255/20746 ,  B01D2255/20761 ,  B01D2255/502 ,  B01D2255/504 ,  B01D2257/402 ,  B01D2257/404 ,  B01J29/072 ,  B01J29/46 ,  B01J29/68 ,  B01J29/7615 ,  B01J2229/42 ,  C01B21/265 ,  C01B21/38 ,  Y02C20/10 ,  Y02P20/153

    摘要： The invention relates to a process and apparatus for preparing nitric acid by catalytic oxidation of NH3 by means of oxygen and subsequent reaction of the NOx formed with an absorption medium in an absorption tower, which comprises a catalyst bed for N2O decomposition arranged in the process gas downstream of the catalytic NH3 oxidation and upstream of the absorption tower in the flow direction and a catalyst bed for NOx reduction and effecting a further decrease in the amount of N2O arranged in the tailgas downstream of the absorption tower in the flow direction, wherein the amount of N2O removed in the catalyst bed for N2O removal arranged in the process gas is not more than that which results in an N2O content of >100 ppmv and a molar N2O/NOx ratio of >0.25 before entry of the tailgas into the catalyst bed for NOx reduction and the catalyst bed for NOx reduction and effecting a further decrease in the amount of N2O arranged in the tailgas contains at least one iron-loaded zeolite catalyst and NH3 is added to the tailgas before entry into the catalyst bed in such an amount that an NOx concentration of

    摘要翻译： 本发明涉及一种用于通过氧气催化氧化NH 3并随后在吸收塔中与吸收介质形成的NOx反应来制备硝酸的方法和装置，其包括在工艺气体中排列的用于N 2 O分解的催化剂床 在催化NH 3氧化下游和吸收塔在流动方向的上游以及用于NOx还原的催化剂床，并且进一步减少在流动方向上在吸收塔下游排出的尾气中的N2O的量，其中量 在催化剂床中除去排放在工艺气体中的N 2 O去除的N 2 O不大于在尾气进入催化剂床之前导致N2O含量> 100ppmv和摩尔N2O / NOx比> 0.25的那些 NO x还原和用于NOx还原的催化剂床并且进一步减少排放在尾气中的N 2 O的量的进一步减少，含有至少一种铁负载沸石ca 在进入催化剂床之前将天竺葵和NH 3加入到尾气中，使得在催化剂床的出口处产生<40ppmv的NOx浓度，并且以这样的方式选择操作参数，使得N 2 O浓度< 200 ppmv结果。

    DEVICE AND METHOD FOR CATALYTIC GAS PHASE REACTION AND THE USE THEREOF
    5.
    发明申请
    DEVICE AND METHOD FOR CATALYTIC GAS PHASE REACTION AND THE USE THEREOF 有权
    用于催化气相反应的装置和方法及其用途

    公开(公告)号：US20100166631A1

    公开(公告)日：2010-07-01

    申请号：US12451874

    申请日：2008-05-28

    申请人： Meinhard Schwefer ,  Michael Groves ,  Jürgen Fuchs ,  Rainer Maurer ,  Rolf Siefert ,  Bernhard Hündgen

    发明人： Meinhard Schwefer ,  Michael Groves ,  Jürgen Fuchs ,  Rainer Maurer ,  Rolf Siefert ,  Bernhard Hündgen

    IPC分类号： B01D53/58 ,  B01J15/00

    CPC分类号： B01J8/008 ,  B01J8/02 ,  B01J8/025 ,  B01J8/0278 ,  B01J8/0285 ,  B01J15/005 ,  B01J19/002 ,  B01J2208/00176 ,  B01J2208/00203 ,  B01J2208/00212 ,  B01J2208/00495 ,  B01J2208/0053 ,  B01J2208/00716 ,  B01J2219/00006 ,  B01J2219/00263 ,  B01J2219/025 ,  C01B21/265 ,  C01B21/28

    摘要： Improved reactors for catalytic, exothermic gas-phase reactions, which comprise, viewed in the flow direction of a feed gas, an inlet zone (1), a reaction zone (2) containing at least one catalyst (4) an outlet zone (3) for the product gas, are described. The reactors are provided in the region of the inlet zone (1) or in the region of the inlet zone (1) and the reaction zone (2) with means, for example an insulating liner (6) and/or apparatuses for the transport of cooling media, which reduce heat transport from the reaction zone (2) into the inlet zone (1) and thus reduce the risk of preignition of the feed gas mixture used or occurrence of undesirable secondary reactions in the inlet zone (1) and/or the interior walls of the reactor in the region of the inlet zone (1) or in the region of the inlet zone (1) and the reaction zone (2) consist of inert material.The reactors can be used, in particular, for the oxidation of ammonia, for example in nitric acid plants in which transition metal catalysts configured as honeycombs and having smaller cross sections than the platinum gauzes customarily used are preferably used.

    摘要翻译： 改进的用于催化，放热气相反应的反应器，其包括在进料气体的流动方向上观察入口区域（1），含有至少一种催化剂的反应区域（2），出口区域（3） ）用于产品气体。 反应器在入口区域（1）的区域中或在入口区域（1）和反应区域（2）的区域中设置有例如绝缘衬垫（6）和/或用于运输的装置 的冷却介质，其减少从反应区域（2）进入入口区域（1）的热传递，并且因此降低了所使用的进料气体混合物的预先燃烧或在入口区域（1）中产生不期望的次级反应的风险和/ 或在入口区域（1）的区域中或在入口区域（1）和反应区域（2）的区域内的反应器的内壁由惰性材料构成。 反应器特别可用于氨的氧化，例如在硝酸设备中，其中优选使用配置为蜂窝状的过渡金属催化剂并且具有比通常使用的铂网布更小的横截面。

    Method For Reducing the Nitrogen Oxide Concentration in Gases
    9.
    发明申请
    Method For Reducing the Nitrogen Oxide Concentration in Gases 有权
    降低气体中氮氧化物浓度的方法

    公开(公告)号：US20080241034A1

    公开(公告)日：2008-10-02

    申请号：US11913450

    申请日：2006-04-27

    申请人： Meinhard Schwefer ,  Rolf Siefert ,  Michael Groves

    发明人： Meinhard Schwefer ,  Rolf Siefert ,  Michael Groves

    IPC分类号： B01D53/56

    CPC分类号： B01D53/8628 ,  B01D2251/202 ,  B01D2251/204 ,  B01D2251/2062 ,  B01D2251/208 ,  B01D2255/20738 ,  B01D2255/50 ,  B01D2257/402 ,  B01D2257/404 ,  Y02C20/10

    摘要： The method comprises passing an N2O- and NOx-containing gas over a sequence of two catalyst beds, adding reducing agents for NOx and for N2O between the catalyst beds in such an amount that not only NOx but also a predetermined proportion of N2O is reduced. The reaction conditions are set so that the N2O content of the gas is reduced by not more than 95%, based on the N2O content at the entrance of the first catalyst bed, by decomposition to nitrogen and oxygen in the first catalyst bed and that not only chemical reduction of NOx but also chemical reduction of N2O occurs in the second catalyst bed so that the N2O content of the gas is reduced by at least 50%, based on the N2O content at the entrance of the second catalyst bed.

    摘要翻译： 该方法包括在两个催化剂床的序列上通过含N 2 O和NO x-x N的气体，向其中加入还原剂， 并且催化剂床之间的N 2 O 2的量不仅仅是NO 2 x N 2，而且N 2 O 2的预定比例减少 。 设定反应条件使得气体的N 2 O 2 O含量基于在入口处的N 2 O 2含量降低不超过95％ 第一催化剂床，通过在第一催化剂床中分解成氮气和氧气，并且不仅在第二催化剂床中发生NO 2 X的化学还原，而且还发生N 2 O 2的化学还原 催化剂床，使得气体的N 2 O 2 O含量基于第二催化剂床入口处的N 2 O 2含量降低至少50％。