Special Catalyst For CPP Process fcc catalyst
CPP (Catalytic Pyrolysis Process) catalysts are developed for CPP process, which is the commercial process using heavy feeds aiming at ethylene and propylene production.
RIPP has developed CPP technologies for meeting the increasing demands of light products. With the specific heavy feed and suitable operation, the ethylene and propylene yield of CPP have been up to 20% and 18% respectively. With a low specification in operation pressure and a large scale in processing capacity, CPP has a comparative sweeter operation conditions, suitable for clients with an economical investment.
CPP catalysts are seeking for high ethylene and propylene selectivity. The catalysts have high matrix activity for bottom primary cracking. Mesopore zeolites have been used for further secondary cracking. The active sites for selective pyrolysis are indispensable. The hydrogen transfer reactions need to be controlled. CPP unit has much more severity on operating conditions than FCCU, and the catalysts have high hydrothermal stability and metals tolerance.
Table 1 Main Specifications of CPP Catalyst
|Chemical components, m%|
|Attrition Index, %/h||≤3.0|
|Attrition Index, g/ml||0.72-0.85|
|Surface Area, m2/g||≥150|
|Pore Volume, ml/g||≥0.22|
|0-40 μm, m%||≤20|
|0-149 μm, m%||≥90|
CPP feedstock has been extended to heavy oils, such as VGO, mixed feed of VGO and vacuum residue, atmospheric residue.
Table 2 Comparison of CPP and DCC: Operating Conditions
|Feedstock||VGO, CGO, AR, VR||VGO, VGO + VR, AR|
|Reaction Temp.||Base case||+70℃|
|Catalyst/oil Ratio||Base case||More|
|Regeneration Temp.||Base case||+40℃|
|Residence Time||Base case||Lower|
|Steam/oil Ratio||Base case||More|
Table 3 Comparison of CPP and DCC: Products Distribution
|Ethylene||Base case||1.5-3 times|
|Location||Capacity, tons/a||Startup Date/Status|
|Shanxi Yanchang, China||1,500,000||2014|
|CEP-1||High propylene selectivity|
|OEP-1||High hydrothermal stability|
|Epylene-1||High ethylene and propylene selectivity|