(Georgia Tech/Biomass Magazine) When making cellulosic ethanol from plants, one problem is what to do with a woody agricultural waste product called lignin. The old adage in the pulp industry has been that one can make anything from lignin except money.
A new review article in the journal Science points the way toward a future where lignin is transformed from a waste product into valuable materials such as low-cost carbon fiber for cars or bio-based plastics. Using lignin in this way would create new markets for the forest products industry and make ethanol-to-fuel conversion more cost-effective.
“We’ve developed a roadmap for integrating genetic engineering with analytical chemistry tools to tailor the structure of lignin and its isolation so it can be used for materials, chemicals and fuels,” said Arthur Ragauskas, a professor in the School of Chemistry and Biochemistry at the Georgia Institute of Technology. Ragauskas is also part of the Institute for Paper Science and Technology at Georgia Tech.
...
The growth of the cellulosic fuel industry has created a stream of lignin that the industry needs to find valuable ways to use. At the same time, federal agencies and industry are funding research to simplify the process of taking biomass to fuels.
“One of the very promising approaches to doing that is to genetically engineer plants so they have more reactive polysaccharides suitable for commercial applications, but also to change lignin’s structural features so that it’ll become more attractive for materials applications, chemicals and fuels.” Ragauskas said.
Research highlighted in the review has shown it’s theoretically possible to genetically alter lignin pathways to reduce undesirable byproducts and more efficiently capture the desired polysaccharides – which are sugars that can be converted to other products – and enhance lignin’s commercial value.
...
“We should be able to alter the structure of lignin and isolate it in such a manner that we can use it for green-based materials or use it in a blend for a variety of synthetic polymers,” Ragauskas said.
Doing so would create a stream of polysaccharides for use as ethanol fuels, with lignin waste that has structural features that would make it attractive for commercial applications such as polymers or carbon fibers.
The science could be applied to a variety of plants currently used for cellulosic biofuel production, such as switchgrass and poplar.
...
“Our primary mission is to reduce the cost of taking biomass to biofuels,” Ragauskas said, “But in the process we’ve learned a lot about lignin, and we might be able to do more than just reduce cost. We might be able to tailor lignin’s structure for commercial applications.” READ MORE Abstract
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