Axens’ Prime-G+TM technology is by far the leading player for FCC gasoline selective desulfurization.
The Prime-G+TM process relies on unrivalled expertise to provide the most appropriate catalytic solution based on simple and robust designs that can achieve the following targets:
- Very high desulfurization rate with good octane retention
- Excellent gasoline yield retention without RVP increase (no cracking reactions)
- Minimum hydrogen consumption
- High operational reliability through a tailor-made conventional hydrotreatment
- Low capital cost investment through a simple fixed bed technology
- High catalyst cycle length that keeps the unit running 100% of the FCC turnaround
- Fully regenerable catalysts (in-situ or ex-situ) at low contaminant levels
- Ability to co-process other sulfur-rich streams such as light coker, visbreaker, straight run or steam cracker naphthas
- Ability to retrofit existing assets
Axens Prime-G+ offer is particularly flexible allowing different process configurations (schemes with or without splitter, 1st stage or 2nd stage selective HDS unit) to best fit the gasoline pool requirement and also maximize refinery profitability.
Although the naphtha splitter may be optional depending on the required HDS severity, the preferred arrangement for minimization of octane loss is a scheme with the association of a Prime-G+ selective hydrogenation unit (SHU) and a splitter, the so called the "Prime-G+ 1st Step" for light naphtha desulfurization and sweetening. It ideally complements the selective HDS on the heavier fraction that outperforms all other processes.
All Prime G+ catalysts present a low sensitivity to impurities and excellent stability suitable for the processing of cracked feedstock due to their optimized metal content and highly neutral carrier.
Specific grading materials developed by Axens are often installed at the top of reactor catalytic beds in order to extend catalyst cycle lengths when processing highly reactive cracked feedstocks.
Depending on the crude, FCC gasoline can contain arsenic which is a poison for all hydrotreatment catalysts. In the case of severe contamination, Axens can offer to install as part of the grading material a dedicated trapping mass which delivers very high arsenic retention without olefin saturation to preserve the octane of the desulfurized FCC gasoline product.
The Prime-G+ technology lends itself to the reuse of idle units: Axens has been awarded more than thirty references for naphtha HDT or semi-regenerative reformer revamping.
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