Emissions from batch hydrogenation reactions in fine chemical industry.
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Fine chemicals, batch reactions, 5000L hydrogenation reactors – how to monitor the composition of the exhaust gases generated in high-risk hydrogenation processes? ? Can it be discharged directly?
What is the composition of exhaust gases? It cannot be discharged directly; for applications with specific requirements, on-line analysis instruments must be installed.
Hydrogen reduction produces hydrogen chloride, which certainly cannot be released directly; therefore, a hydrochloric acid absorption system is necessary. For safety reasons, nitrogen shielding should be employed during the reaction process, and nitrogen sparging should also be added to the hydrochloric acid absorption system to enhance safety. The exhaust gas after being absorbed by hydrochloric acid passes through a scrubber tower before it can be directly released at a high altitude.
Exhaust gases must be monitored in real time, and can only be released after proper treatment
As mentioned on the second floor, in the process I’ve seen, the hydrogenation exhaust gas first passes through a condenser where part of it is condensed; the remaining non-condensable gas is then absorbed. The absorption liquid is recovered through stripping, or as mentioned on the second floor, by nitrogen stripping and distillation. The gas that has not been absorbed is subsequently treated with acid washing, alkali washing, or water washing, depending on the properties of the gas phase. After washing, it is either sent to a flare or discharged in compliance with environmental standards.
In the continuous hydrogenation process, hydrogen is generally only emitted during startup and shutdown. During the reaction process, only a small amount of inert gas is emitted. It can **reduce hydrogen consumption**. Reduce air pollution.
You haven’t specified the exact details; how can I give targeted advice?