Reasons for the darkening of crude benzene
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1. Leakage in the oil-gas heat exchanger 2. Flood condition in the benzene removal tower 3. Either excessive air intake to the regenerator or excessive steam flow directly into the benzene removal tower
If the crude benzene turns black, it’s likely that oil from the washing process has entered the crude benzene; there may be leaks in the oil cooling system of the condensation cooler, or the separation in the control separator is not effective