Desorption and exhaust gas catalysis of CHC and BTEX

Process:

The incoming water was freed from the CFCs and CHCs in the first desorption column with a low air volume flow. The resulting exhaust air was treated by catalytic exhaust air purification. In order to expel the remaining pollutants, the pre-purified water went through a second desorption stage. For this purpose, the clean air was supplied to the catalytic oxidation plant. In this way, the energy costs for the exhaust gas catalysis could be kept as low as possible. In addition, the HCl and HF formed were washed out in the second column [TA Luft].

For the exhaust gas catalysis, propane was used as an energy supplier. On the one hand, propane was used as a hydrogen supplier for the chlorine released during catalytic oxidation (hydrogen chloride is formed from chlorine and hydrogen), and on the other hand, propane is much cheaper as an energy supplier than electricity.