Quick Cook Method Turns Algae Into Biocrude

This article is posted with permission from DomesticFuel.com.

Researchers from University of Michigan have developed a way to “pressure cook” algae for as little as one minute and transform up to 65 percent of the algae into biocrude. Phil Savage, a professor of chemical engineering at the University of Michigan, said the research team is trying to mimic the process nature uses when creating crude oil, and his algae of choice is green marine micro-alga.

To make their one-minute biocrude, Savage and Julia Faeth, a doctoral student in Savage’s lab, filled a steel pipe connector with 1.5 milliliters of wet algae, capped it and plunged it into 1,100-degree-Fahrenheit sand. The small volume ensured that the algae was heated through. Previously the team heated the algae from 10 to 90 minutes and saw the best results when treating the algae for 10 to 40 minutes at 570 degrees. A small batch of algae can reach this temperature in one minute.

Savage and Faeth aren’t sure why the one-minute results were so much better until they do more experiments. “My guess is that the reactions that produce biocrude are actually must faster than previously thought,” Savage surmised. Yet Faeth suggests that the fast heating might boost the biocrude by keeping unwanted reactions at bay. “For example, the biocrude might decompose into substances that dissolve in water, and the fast heating rates might discourage that reaction,” Faeth said.

The team also said that shorter reaction times mean that the reactors don’t have to be as large. By reducing the reactor volume, the cost to build a biorefinery also decreases. The researchers caution they won’t know for sure if the new method is faster and cheaper until the process is further developed.