|
The regeneration of spent acid produces acid at much higher costs, compared to to the acid produced from conventional raw materials. But the crucial question of economics can not be answered by production costs alone. With the enforcement of restrictive pollution control laws, costs for the ecologically acceptable disposal of spent acids must be added when comparisons are made with the costs for conventional acid production.
To ensure complete decomposition of the acid and combustion of organic impurities, the decomposition process is carried out at a temperature of more than 1,000°C under oxidizing conditions. In practice, the heat required for this strongly endothermic process is supplied by means of hot flue gases from the combustion of fossil fuels or sulfur-containing fuel. A large portion of the additional heat can be recovered when the gases leaving the reactor are cooled from 1,000°C to about 350°C. Depending on the intended use of the recovered energy, different waste-heat systems may be employed.
For further information, please contact  acid(at)outotec.com
|