FLOS Additive FCC additive FCC catalyst
FLOS is a promoter for selectively enhancing FCC propylene & isobutene yields.
Both propylene and isobutene from FCCU are important raw materials for chemical industry. FLOS provides a flexible solution for light olefins boosting which could be tailored in formulations according to refinery situation. FLOS-I is specially designed mainly for enhancing propylene yield while FLOS-II mainly for isobutene yield. FLOS-III is an additive for enhancing propylene and isobutene yields.
Based on the studies of hydrocarbon reaction chemistry and catalytic material chemistry, a new concept is proposed for promoting propylene & isobutene productions: the precursor for C3 and C4 olefins are essentially C6-C8 carbenium ions. Zeolites with distinct topologies can give different product selectivity. Furthermore, the acid properties of catalytic materials were modified to improve the mono-molecular cracking of C6-C8 secondary and tertiary carbenium carbonium ions and depress the hydrogen transfer reaction. Meanwhile, isomerization of n-butene is promoted by incorporating a novel matrix material.
The main specifications of FLOS additive are shown in Table 1.
Table 1 Main Specifications of FLOS
|Chemical components, m%|
|Attrition Index, %/h||≤3.0|
|Bulk Density, g/ml||0.65-0.85|
|Surface Area, m2/g||≥150|
|Pore Volume, ml/g||≥0.22|
|Particle Distribution, m%|
|800℃ /4h, m%||≥45|
The industrial application was conducted on MIP-CGP unit of SINOPEC Baling Petrochemical. The promoter addition started from August 2012. Performance test conducted in December 2012. Fresh promoter make up carried out on a day-to-day base. FLOS-III content in inventory reached a level of 6% in December 2012. The results are listed in Table2.
FLOS promoter exhibits excellent performance not only in enhancing propylene & isobutene yields but also in improving propylene & isobutene selectivity. According to the results of commercial application, LPG yield increased by 2.68%, in which 1.01% for propylene and 0.54% for isobutene respectively. Meanwhile the gasoline olefin content is reduced whereas RON & MON increased slightly. LCO yield decreased while the total liquid yield maintain unchanged. FLOS shows no negative influence on fluidization status in long term operation.
Table 2 Industrial Application Results of FLOS
|Catalyst||Base||Base + FLOS|
|Main operation conditions|
|Reaction temp., ℃||527||519|
|Regeneration temp., ℃||700||692|
|Density (20 ℃ ), g/cm3||0.8787||0.8667|
|Carbon residue, m%||4.02||4.12|
|Basic N, mg/kg||593||573|
|Products distribution, wt%|
|Gasoline + LCO, wt%||56.03||53.32|
|Total liquid yield, wt%||83.82||83.99|
|Propylene yield, wt%||9.10||10.11|
|Isobutene yield, wt%||3.43||3.97|
|Olefin content, m%||35.6||31.1|
Since August of 2012, FLOS-III has been used in SINOPEC Baling Petrochemical.
FLOS-I, FLOS-II and FLOS-III