| 摘要 |
<p>The invention to a method for cleaning gases containing low percentages of sulphur dioxide of their sulphur dioxide content with the aid of a sulphuric-acid contact process effected at elevated pressure, in which the sulphur dioxide is converted to sulphur trioxide and the sulphur trioxide is absorbed in concentrated sulphuric acid. Prior to charging the waste gas to the contact process, the sulphur dioxide content of the gas is adjusted to above about 0.2%. The elevated pressure is so selected in relation to the sulphur dioxide content of the gas charged to the process as to obviate the need of supplying thermal energy separately thereto or removing thermal energy separately therefrom.</p> |
