Technology Description

IsoA™ Technology Isomerizes and Aromatizes low octane, C5-C7+ paraffinic feed (such as light straight run naphtha, raffinate, NG condensate liquids) and converts it in a fixed bed reactor to an upgraded, high octane, gasoline blend stock. With a primarily C6/C7 feed, the upgraded stream typically has a 20+ unit increase in octane, a reduction in RVP and a 90% reduction in the sulfur content compared to the feed.

This low CAPEX, low pressure process has a small footprint and utilizes standard refinery equipment, such as fixed-bed reactors, absorption and separation columns. The heterogeneous catalyst is sulfur tolerant and eliminates the hydrotreating process required for conventional isomerization processes. No recycle gas is required, so maintenance and energy intensive hydrogen compression required by the conventional isomerization process is also eliminated. The process can be further optimized with a boost in octane, an increase in yield and a reduction in operating cost by co-feeding olefin containing LPG.

The product exit the reactor is cooled and stabilized for blending into the gasoline pool.

Key Features

• Feed is low octane light naphtha, topped oil, raffinate oil, reformate, NG condensate… ideally C5 to C7+ paraffinic naphtha.
• Fixed bed reactor with product fractionation to separate the upgraded naphtha from LPG.
• Typical yield is ~70-85 wt% blend stock.
• Octane enhancement increases as feed octane decreases with an 20+ point increase possible for a primarily C6/C7 feed. Typical product RON is in the 80 to 89 point range.
• Decrease in RVP dependent on the feed composition; increase in the dry point temperature by 20 to 30°C.
• Removes sulfur without adversely impacting octane (with 150 ppm in feed can achieve <10 ppm. Sulphur removal (>90% efficiency). 
• Catalyst life is expected to be > 3 years.
• Proprietary Catalyst is a metal-modified, nano-sized Zeolite.
• Co-feed of olefin containing LPG is an option to increase the Octane boost, improve yields  and eliminate/minimize heat input.
• Co-locating a DTL™ plant (highly exothermic reaction) with IsoA™ plant (endothermic reaction) allows both energy integration and CAPEX reduction due to common fractionation equipment.
• 6 commercial plants in operation with 3 additional plants under construction.

see diagram >>