Alkylate is an excellent, high-octane blending component for motor gasoline, and is well-accepted in the marketplace. Alkylate is made by reacting light olefins, such as butylenes, from typical refinery sources; fluid catalytic cracking units, or from steam cracking units, with isoparaffins, such as isobutane, in the presence of an acidic catalyst.
The CB&I CDAlky® gasoline alkylation technology is an advanced sulfuric acid alkylation process that operates at significantly lower temperatures than conventional technology—below 0°C—which favors the formation of the desired product isomer, trimethylpentane. Side reactions are greatly minimized, which also reduces acid consumption rates appreciably.
The CB&I AlkyClean® gasoline alkylation technology employs a true solid alkylation catalyst. For refiners needing or wanting to avoid liquid acid catalyst altogether, the AlkyClean technology offers such a solution.
Both technologies have been successfully commercialized.
There are strong economic incentives for on-purpose upgrading of butanes to alkylate. CB&I offers the only proven scheme to yield the highest alkylate quality (up to 98 RON) in the market place.
The presence of high concentrations of isobutylene in alkylation olefin feeds reduces the alkylate product quality and octane value due to its highly reactive nature. CB&I’s CDAlkyPlus® technology couples the CDAlky® alkylation process with a simple olefin pretreatment step when high concentrations of isobutylene are present in the olefin feed.
Low Pressure Olefins Recovery is a cost-effective route to recovery ethylene, ethane and other hydrocarbons from FCC, coker and other refinery gas streams.