The natural loss of catalyst of one cycle used in 600 kt/a catalytic cracking unit in Harbin Petrochemical Company was about 1.0 kg/t before the overhaul,which was much higher than that of conventional catalytic cracking unit.By calculating and analyzing the cause of the natual loss,optimizing the device load and balancing the pressure of the pipe network,the natural loss of the catalyst was gradually reduced from 1.08 kg/t in the initial stage to 0.71 kg/t.
catalytic crackingcatalystdevice transformationnatural loss
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