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公开(公告)号：US20150376010A1
公开(公告)日：2015-12-31
申请号：US14766078
申请日：2014-02-07
CPC分类号： C01B21/40 , B01J19/24 , B01J2219/00162 , B01J2219/24 , C01B21/262
摘要： In a process for preparing nitric acid, nitrogen oxides are first generated in an ammonia combustion plant (2), and these are then supplied to at least one absorption tower (4, 5). In the absorption tower (4, 5), the nitrogen oxides are contacted in the water and oxygen, with at least partial reaction of the nitrogen-containing gas mixture with the water and the oxygen to form an aqueous nitric acid-containing solution which collects at the base of the absorption tower (4, 5) and is subsequently compressed and introduced via a riser line (12, 14, 21) back into the absorption tower (4, 5). In order to minimize the concentration of nitrogen oxides in the offgas from such a plant, it is proposed in accordance with the invention that oxygen be introduced in liquid form or gaseous form into a region of the riser line (12, 14, 21) that is lower in a geodetic sense. This promotes the dissolution of the oxygen and the reaction of the oxygen with likewise dissolved nitrogen oxides to give nitric acid.
摘要翻译： 在制备硝酸的方法中，首先在氨燃烧装置（2）中产生氮氧化物，然后将其供应至少一个吸收塔（4,5）。 在吸收塔（4,5）中，氮氧化物在水和氧气中接触，含氮气体混合物与水和氧的至少部分反应形成含硝酸的含水溶液， 在吸收塔（4,5）的基部处，并随后经由提升管线（12,14,21）压缩并引入到吸收塔（4,5）中。 为了使来自这种植物的废气中的氮氧化物的浓度最小化，根据本发明提出，将氧气以液体形式或气态引入到提升管线（12,14,21）的区域中， 在大地测量中较低。 这促进氧的溶解和氧与同样溶解的氮氧化物的反应，得到硝酸。
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