How to make it easier to turn plant waste into biofuels

January 14, 2020

Researchers have developed a new process that could make it much cheaper to produce biofuels such as ethanol from plant waste and reduce reliance on fossil fuels.

Their approach, featuring an ammonia-salt based solvent that rapidly turns plant fibers into sugars needed to make ethanol, works well at close to room temperature, unlike conventional processes, according to a Rutgers-led study in the journal Green Chemistry.

"Our pretreatment system can slash - by up to 50-fold - the use of enzymes to turn solvent-treated cellulose (plant fiber) into glucose (a sugar) used to make bioproducts like ethanol," said lead author Shishir P. S. Chundawat, an assistant professor in the Department of Chemical and Biochemical Engineering in the School of Engineering at Rutgers University-New Brunswick. "Similar processes could greatly reduce the cost of producing biofuels from waste biomass like corn stalks and leaves."

The solvent can also extract more than 80 percent of the lignin in plant waste. Lignin, which binds to and fortifies plant fibers, could be used to help upgrade valuable aromatic chemicals in the future, according to Chundawat. The research benefited from collaborative efforts and access to a high-tech Bio-SANS instrument at Oak Ridge National Laboratory for analysis of how complex biological systems like plant waste respond during processing to better understand how cellulose is dissolved at a molecular level.

Corn stalks, leaves and other residue (called corn stover) and switchgrass, for example, have tightly packed cellulose microfibrils, which are tiny strands thinner than fibers. Microfibrils are difficult to break down using enzymes or microbes, making it hard to turn many plant-based materials in biomass into biofuels or biochemicals. Biomass includes microbial, plant or animal-derived materials used for renewable energy production and industrial processes.

Speeding up the conversion of cellulose into sugars like glucose with enzymes requires suitable solvents or heat- and/or chemical-based pretreatments. In the last 150 years, several solvents that can break down cellulose fibers have been explored. But most solvents remain costly or require extreme ranges of operating pressures or temperatures to be effective.

The ammonia-salt based solvent system quickens the conversion of cellulose into sugars using enzymes. It can greatly reduce the cost of biofuels production because enzymes can account for about 15 percent to 20 percent of the cost of making biofuels like ethanol from biomass.

Next steps will be to optimize the pretreatment process for biomass like corn stover, municipal solid wastes and bioenergy crops like switchgrass and poplar that could be turned into fuels, while also developing more robust enzymes to further reduce costs, according to Chundawat.
Rutgers co-authors include former post-doctoral fellow Shyamal Roy; doctoral student Shashwat Gupta; Ramendra Pal, a post-doctoral associate; and Chao Zhao, a former post-doctoral fellow.

Rutgers University

Related Biofuels Articles from Brightsurf:

Making biofuels cheaper by putting plants to work
One strategy to make biofuels more competitive is to make plants do some of the work themselves.

How to make it easier to turn plant waste into biofuels
Researchers have developed a new process that could make it much cheaper to produce biofuels such as ethanol from plant waste and reduce reliance on fossil fuels.

Barriers and opportunities in renewable biofuels production
Researchers at Chalmers University of Technology, Sweden, have identified two main challenges for renewable biofuel production from cheap sources.

How biofuels from plant fibers could combat global warming
A study from Colorado State University finds new promise for biofuels produced from switchgrass, a non-edible native grass that grows in many parts of North America.

Calculating the CO2 emissions of biofuels is not enough
A new EU regulation aims to shrink the environmental footprint of biofuels starting in 2021.

Algae cultivation technique could advance biofuels
Washington State University researchers have developed a way to grow algae more efficiently -- in days instead of weeks -- and make the algae more viable for several industries, including biofuels.

Cutting the cost of ethanol, other biofuels and gasoline
Biofuels like the ethanol in US gasoline could get cheaper thanks to experts at Rutgers University-New Brunswick and Michigan State University.

Cellulosic biofuels can benefit the environment if managed correctly
Could cellulosic biofuels -- or liquid energy derived from grasses and wood -- become a green fuel of the future, providing an environmentally sustainable way of meeting energy needs?

Making oil from algae -- towards more efficient biofuels
The mechanism behind oil synthesis within microalgae cells has been revealed by a Japanese research team.

WSU study finds people willing to pay more for new biofuels
When it comes to second generation biofuels, Washington State University research shows that consumers are willing to pay a premium of approximately 11 percent over conventional fuel.

Read More: Biofuels News and Biofuels Current Events is a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for sites to earn advertising fees by advertising and linking to