Process for the recovery of NO from the waste gas resulting from the
production of ammonium nitrite
    2.
    发明授权
    Process for the recovery of NO from the waste gas resulting from the production of ammonium nitrite 失效
    从生产亚硝酸铵产生的废气中回收NO的方法

    公开(公告)号:US4971776A

    公开(公告)日:1990-11-20

    申请号:US398105

    申请日:1989-08-24

    摘要: A process for the complete recovery of NO from the waste gas of ammonium nitrite production, in which gases containing nitrogen oxides are absorbed in a first stage in a solution of ammonium carbonate and/or ammonium bicarbonate to form ammonium nitrite solutions and the resulting waste gas containing carbon dioxide is absorbed in a second stage in an ammoniacal, aqueous solution to form ammonium carbonate and/or ammonium bicarbonate which is returned as such to the first absorption stage, and the waste gas containing carbon dioxide is brought into contact with a sulphuric acid of medium concentration containing from 0.1-5% by weight, preferably from 0.2 to 1.5% by weight of nitric acid before the carbon dioxide is introduced into the second absorption stage.

    摘要翻译: 一种从亚硝酸铵生产废气中完全回收NO的方法,其中含有氮氧化物的气体在碳酸铵和/或碳酸氢铵溶液中的第一阶段被吸收,形成亚硝酸铵溶液,所得到的废气 含水二氧化碳在氨水溶液中被吸收在第二阶段中以形成碳酸铵和/或碳酸氢铵,这样在第一吸收阶段返回,并且使含二氧化碳的废气与硫酸接触 在将二氧化碳引入第二吸收阶段之前,中等浓度含有0.1-5重量%,优选0.2-1.5重量%的硝酸。