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`NExOCTANE™ Isooctane Process 2003-12
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`PEP Review 2003-12
`NExOCTANE™ Isooctane Process
`
`View Report
`Published: November 2003
`The NExOCTANE™ process developed by Fortum's Neste Engineering Oy and licensed
`exclusively in the Americas through Kellogg Brown & Root selectively converts isobutylene to
`mainly di-isobutylene (isooctene) that is optionally hydrogenated to paraffinic isooctane. Both
`di-isobutylene and isooctane are high octane number, high quality gasoline blending stocks.
`The process is especially attractive for refiners wishing to discontinue methyl tertiary butyl ether
`(MTBE) production since usually the fixed bed reactors, the fractionator and much of the MTBE
`unit can be utilized in the conversion into a NExOCTANE plant.
`California and some 16 other states banned or limited the use of MTBE due to contamination of
`underground water by MTBE contained in gasoline leaking from underground storage tanks.
`The bans in California (31.7% of U.S. MTBE consumption), New York (7.5%) and Connecticut
`(3.1%) are effective by January 1, 2004. The future use in the rest of the U.S. is in doubt.
`In the U.S., 29 refiners have MTBE units. Capacities range from 660 to 20,000 BPCD with the
`average plant producing 3,000 BPCD. Total North American production at refineries is 114,017
`BPCD. Outside North America, 58 refineries produce 95,230 BPCD of MTBE, averaging 1642
`BPCD. Worldwide, 91 refiners produce 209,250 BPCD of MTBE with a portion exported to the
`U.S. market. Already, one Canadian MTBE unit has been converted into a NExOCTANE unit.
`Pure isooctane (2,2,4 trimethylpentane) has both a high research octane number (RON) and a
`high motor octane number (MON): 100 RON and 100 MON. Isooctane's low Reid vapor
`pressure of 1.8 psi is also attractive for bending into reformulated gasoline. Of course,
`isooctane is sulfur and aromatic free. The octane number is higher than alkylate or polymerate,
`two alternate blending stocks that are also made from isobutylene. The low density of isooctane
`results in more barrels of gasoline per pound of blendstock. In many cases when the olefins
`can be accommodated in the gasoline pool, blending the di-isobutylene is an attractive option
`for increasing octane number. The blending octane numbers of isooctene at 10 vol% in CARB
`base gasoline (from fluid catalytic cracking) are 124 RON and 99 MON.
`We review the NExOCTANE process. We develop the economics for a generic grassroots,
`1,801 BPSD (69,510 mt/yr or 286.4 m3/SD) NExOCTANE unit producing isooctane at an on
`stream factor of 0.95. The economics of retrofitting a MTBE unit depend greatly on the
`specificapplication. These grassroots economics may serve as a starting point and benchmark
`when considering retrofitting.
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`NExOCTANEâ„¢ Isooctane Process - November 2003 | IHS Chemical
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