| 摘要 |
<p>The invention relates to the chemical industry, namely to a method for producing hydroxylamine sulphate (HAS) used for caplrolactam production. The inventive method consists in preparing a reaction mixture, catalytically oxidising ammoniac at a pressure equal to or less than 0.3 MPa, concentrating a nitrous gas by means of water vapours, mixing said concentrated nitrous gas with hydrogen by a mixture of sulphuric acid, water, nitrous gas concentrating condensate, condensate of secondary concentration of HAS and in synthesising HAS. Nitrous gas heat is used for concentrating a nitric condensate and a HAS solution. Said nitric condensate is concentrated until a nitric acid mass fraction of 40 % is attained and delivered in the form of a final product which is used for producing mineral fertilisers. The HAS solution is concentrated until a mass fraction of 40 % is attained by using distillate condensing heat produced during a nitric condensate concentrating. Said improved method makes it possible to reduce investment costs and production energy consumption and to simplify the process control</p> |
