Catalytic cracking startup
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With catalytic cracking in operation and the three streams at the bottom of the fractionator being rerouted inside the tower, should the cold reflux at the top of the fractionator be turned on? If it’s not turned on, when will the backflow prevention device be activated?
The top reflux cannot be turned on; it should be turned on after feeding begins.
Used after top reflux feeding to control the top temperature and prevent column flooding