Special Catalyst For DCC Process fcc catalyst
DCC (Deep Catalytic Cracking) catalysts are developed for DCC process, which is the commercial process using heavy feeds aiming at propylene production.
In order to meet the increasing market demand for enhancing the production of propylene, SINOPEC RIPP had developed DCC technologies for light olefins production. With the specific heavy feed and suitable operation, the propylene yield of DCC has been up to 20%. With a low specification in operation pressure and a large scale in processing capacity, DCC has a comparative sweeter operation conditions, this is very suitable for clients with an economical investment.
DCC catalysts are seeking for high propylene selectivity. The catalysts have high matrix activity for bottom primary cracking. Mesopore zeolites have been used for further secondary cracking. The isomerization performance is indispensable, and the hydrogen transfer reactions need to be controlled. DCC unit has more severity on operating condition than FCC unit, so the catalysts have high hydrothermal stability and metals tolerance.
Table 1 Main Specifications of DCC Catalyst
|Chemical components, m%|
|Attrition Index, %/h||≤2.5|
|Bulk Density, g/ml||0.72-0.85|
|Surface Area, m2/g||≥190|
|Pore Volume, ml/g||≥0.26|
|DMA (800℃/4h) , m%||≥65|
DCC feedstock has been extended to heavy oils, the same as FCC feedstock, such as VGO, deasphalted oil, coker gas oil, atmospheric residue, vacuum residue, and other heavy feeds.
Table 2 Comparison of DCC and FCC: Operating Conditions
|Reaction Temp.||Base||+ -30℃|
|Catalyst/oil Ratio||Base||1.5-2 times|
Table 3 Comparison of DCC and FCC: Products Distribution