Operating principle High-pressure catalytic systems
The high-pressure exhaust gas which contains methyl acetate, methyl bromide, and carbon monoxide, can be purified directly without prior expansion and fed into the high-pressure catalytic system.
The exhaust gas is first heated using a heat exchanger that is powered by steam or preheated air. To improve the energy efficiency of the system, the temperature of the exhaust gas is increased using an air-to-air heat exchanger, which is heated with clean air, until the gas reaches the operating temperature of the catalyst.
After the organic pollutants have been converted in the catalyst, the purified exhaust gas is cooled, and the heat is recovered in the air-to-air heat exchanger. The cooled and purified exhaust gas, which is still under pressure, is then returned to the production system. The energy from the gas can be recovered in a downstream expander.