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    Process for preparing nitric acid with a concentration in the range from 50 to 77.8% by weight
    3.
    发明授权
    Process for preparing nitric acid with a concentration in the range from 50 to 77.8% by weight 有权
    制备浓度为50-77.8重量％浓度的硝酸的方法

    公开(公告)号：US08765009B2

    公开(公告)日：2014-07-01

    申请号：US12601534

    申请日：2008-07-08

    申请人： Heinz-Josef Kneuper ,  Jan-Martin Loening ,  Stephanie Mollner ,  Joerg Torsten Nickel

    发明人： Heinz-Josef Kneuper ,  Jan-Martin Loening ,  Stephanie Mollner ,  Joerg Torsten Nickel

    IPC分类号： C09K3/00

    CPC分类号： C01B21/40 ,  C01B21/262

    摘要： A process for preparing nitric acid by: catalytically oxidizing ammonia, to obtain a gas mixture containing NO and O2; cooling and condensing the gas mixture, thereby further oxidizing NO with O2, to obtain a gas stream containing NO2/N2O4 and an aqueous solution containing nitric acid; and countercurrently absorbing the NO2/N2O4 from the gas stream in an absorber with process water (H2O), to obtain nitric acid and an NOx-containing absorber offgas, wherein the water content of the nitric acid is regulated to a concentration in the range from 50 to 77.8% by weight and the NOx content of the absorber offgas to a concentration in the range from 20 to 500 ppm, by continuously measuring the water content of the process air supplied to the catalytic gas phase oxidation and, as a function of this, adjusting the amount of process water (Q-H2O) fed to the absorber.

    摘要翻译： 一种通过以下方式制备硝酸的方法：催化氧化氨，得到含NO和O2的气体混合物; 冷却并冷凝气体混合物，从而进一步用O 2氧化NO，得到含有NO 2 / N 2 O 4的气流和含有硝酸的水溶液; 并用工艺用水（H 2 O）从吸收器中的气流中逆流吸收NO 2 / N 2 O 4，得到硝酸和含NO x的吸收剂废气，其中将硝酸的含水量调节至 50至77.8重量％，并且通过连续测量供应到催化气相氧化的工艺空气的水含量，吸收器的NOx含量废气至浓度在20至500ppm的范围内，并且作为其功能 ，调节供给到吸收器的工艺用水（Q-H 2 O）的量。

    PROCESS FOR PREPARING NITRIC ACID WITH A CONCENTRATION IN THE RANGE FROM 50 TO 77.8% BY WEIGHT
    4.
    发明申请
    PROCESS FOR PREPARING NITRIC ACID WITH A CONCENTRATION IN THE RANGE FROM 50 TO 77.8% BY WEIGHT 有权
    制剂浓度范围为50〜77.8％的硝酸工艺

    公开(公告)号：US20100181530A1

    公开(公告)日：2010-07-22

    申请号：US12601534

    申请日：2008-07-08

    申请人： Heinz-Josef Kneuper ,  Jan-Martin Loening ,  Stephanie Mollner ,  Joerg Torsten Nickel

    发明人： Heinz-Josef Kneuper ,  Jan-Martin Loening ,  Stephanie Mollner ,  Joerg Torsten Nickel

    IPC分类号： C09K3/00

    CPC分类号： C01B21/40 ,  C01B21/262

    摘要： What is proposed is a process for preparing nitric acid with a concentration in the range from 50 to 77.8% by weight by catalytic gas phase oxidation of ammonia (1) with a superstoichiometric proportion of process air (2) to obtain a gas mixture (3) comprising NO and O2, cooling/condensation of the gas mixture (3) comprising NO and O2, in the course of which NO is oxidized further by O2 to NO2/N2O4 to obtain an aqueous solution (4) comprising nitric acid and a gas stream (5) comprising NO2/N2O4 and countercurrent absorption of the NO2/N2O4 from the gas stream (5) comprising NO2/N2O4 in process water (H2O) in an absorber (A) to obtain the nitric acid (7) with a concentration in the range from 50 to 77.8% by weight and an NOx comprising absorber offgas (6), wherein the water content of the nitric acid (7) is regulated to a concentration in the range from 50 to 77.8% by weight and the NOx content of the absorber offgas (6) to a concentration in the range from 20 to 500 ppm, by continuously measuring the water content of the process air (2) supplied to the catalytic gas phase oxidation and, as a function of this, adjusting the amount of process water (Q-H2O) fed to the absorber (A).

    摘要翻译： 提出的方法是用超化学计量比例的工艺空气（2）通过氨（1）的催化气相氧化制备浓度在50至77.8重量％范围内的硝酸的方法以获得气体混合物（3 ），其包含NO和O 2的气体混合物（3）的冷却/冷凝，其中NO通过O 2进一步氧化成NO 2 / N 2 O 4，以获得包含硝酸和气体的水溶液（4） 包含NO 2 / N 2 O 4的流（5）和来自在吸收器（A）中的处理水（H 2 O）中的包含NO 2 / N 2 O 4的气流（5）的NO 2 / N 2 O 4的逆流吸收，以获得具有浓度的硝酸 在50至77.8重量％的范围内，和包含吸收剂废气（6）的NOx，其中将硝酸（7）的含水量调节至50至77.8重量％的浓度，并且NOx含量 的吸收剂废气（6）浓度达到20〜500ppm的浓度 y测量供应到催化气相氧化的工艺空气（2）的含水量，并且作为其功能，调节进料到吸收器（A）的工艺用水（Q-H 2 O）的量。