RECOVERY OF NO FROM WASTE GAS GENERATED AT TIME OF PRODUCTION OF AMMONIUM SULFITE

摘要

NO is completely recovered from the waste gas of ammonium nitrite production by absorbing the nitrous fumes in a first stage in an ammonium carbonate and/or ammonium bicarbonate solution to form ammonium nitrite solutions, absorbing the resulting waste gas containing carbon dioxide in a second stage in an ammonia solution to form ammonium carbonate and/or ammonium bicarbonate which is/are recycled as such into the first absorption stage.