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GT-BenZap®: cost-effective benzene management

GT-BenZap_^®: Cost-Effective Benzene Management: GTC Technology’s process know-how can meet refiners’ needs by providing a variety of cost-effective solutions, ranging from aromatics extraction to catalytic hydrogenation for benzene management in gasoline-bound streams. GT-BenZap is a benzene saturation process that is designed as a low-cost alternative for refineries limited by economies of scale, or for units located in remote areas away from benzene consumers, to enable them to comply with the EPA’s regulations. When implementing GT-BenZap, GTC provides custom integration with the refiner’s existing units for effective benzene management.

GTC Technology’s GT-BenZap allows refineries to implement a low-cost benzene saturation process to ensure compliance with the EPA regulations under Control of Hazardous Air Pollutants from Mobile Sources (MSAT2).

Process Overview
The GT-BenZap process features a reliable traditional design paired with a proven nickel-based catalyst. GT-BenZap consists of hydrotreating a narrow-cut C6 fraction, which is separated from the full range reformate to saturate the benzene component into cyclohexane. The reformate is first fed to a reformate splitter where the C6 heartcut is separated as a side draw fraction, while the C7+ cut and the C5- light fraction are removed as bottom and top products of the column.

The C6 olefins present in the C6 cut are also hydrogenated to paraffins, while the C5- olefins removed at the top of the splitter are not, preserving the octane. The hydrogenated C6 fraction from the reactor outlet is sent to a stabilizer column where the remaining hydrogen and lights are removed overhead. The C5- cut, produced off the splitter overhead, is recombined with the hydrogenated C6 cut within the GT-BenZap process in a unique manner that reduces energy consumption and capital equipment cost. The light reformate is mixed with the C7+ cut from the splitter column and together form the full range reformate, which is now low in benzene content. Energy consumption ranges from 900-1,000 btu/lb feed. Hydrogen
consumption is nominal, approximately 10 percent above stoichiometric. Refinery H2 availability will determine system design requirements. GTC also offers a modular construction option and the possibility of reusing existing equipment or a conventional splitter design.

Advantages
GT-BenZap is more economical than platinum-based benzene saturation systems and can be adapted to retrofit existing refinery units. In addition to being competitively priced and yielding lower operating costs, the process offers refiners the following benefits:
• Ability to reduce benzene in the reformate stream by over 99.9 percent
• Simple and reliable technology that uses an isolated hydrogenation reactor
• World-class catalyst utilized in the process
• Minimized impact to hydrogen balance and octane loss
• Reliable method to meet the EPA’s Control of Hazardous Air Pollutants from Mobile Sources (MSAT2) regulations

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