STG+ (Syngas To Gasoline +, the plus standing for the multiple end products yielded by the process) essentially improves upon commercial methanol synthesis processes and ExxonMobil’s methanol to gasoline (MTG) process, combining them into a single-loop process that converts syngas directly to gasoline. In addition to the gasoline product, the STG+ process can also produce jet fuel, diesel and high-value chemicals by changing the catalysts and operating conditions.

As verified by Bureau Veritas, an independent, multinational inspection, sampling and testing company, Primus’ gasoline was found to meet or exceed all ASTM specifications.

An independent engineer’s report prepared by E3 Consulting, LLC, concluded that STG+ system and catalyst performance exceeded expectations during plant operation.

The data resulting from the initial 720-hour continuous operation of Primus’ natural gas-to-gasoline demonstration plant has exceeded initial expectations. The data show that Primus’ STG+ technology, when applied at commercial scale, can be expected to be efficient, cost-effective and able to produce a premium transportation fuel product.

—Paul Plath, President at E3 Consulting, LLC.

Primus’ demonstration plant is designed as a scaled-down version of the first commercial plant. Primus worked with top-tier engineering firms to optimize the design of the demonstration plant to eliminate the technology risks of scale-up, which in the past have been a major obstacle for competitors in the alternative fuels space.

The independent engineers’ report provides critical validation of our technology and of our value proposition, and the data suggests that our technology is more economical than competing gas-to-liquids processes available today. We can now focus on optimizing our process even further and on working toward construction of our first commercial plant, which like the demonstration plant will use natural gas as a feedstock for the production of drop-in transportation fuels.

—Robert Johnsen, CEO of Primus Green Energy