| 摘要 |
<p>In a process for removing sulphur compounds from Claus off-gas comprising a reduction step, a cooling step and an absorption or adsorption step, the sulphur dioxide content of the reduced gas is monitored by subjecting a portion of the water-containing cooling liquid after the cooling step to stripping with an inert gas and to measuring the pH of the so stripped cooling liquid; the flow of the off-gas and/or of the reducing agent to the reduction step is controlled in dependency of the results of the pH measurement.</p> |
