review article

  • Conditioning with Reducing Agents Shown to Raise Yields in Advanced Biofuel Production

    CM slurry AS231115Carlos Martín and Bio4Energy colleagues have developed a one-step biomass conditioning-and-conversion process which could bring cost-efficiency to cellulosic ethanol production. Photo by Bio4Energy.Bio4Energy researchers have invented a process which could bring greater certainty of cost efficiency to industrial biorefineries that choose to base their operations on lignocellulosic input materials such as wood from spruce or pine trees.

    Currently the U.S.A. and Italy are among few countries in the world to host industrial biorefineries for the production of ethanol based on cellulose via the biochemical conversion route using industrial enzymes and yeast. However, these biorefineries mainly use agricultural residue as feedstock in their operations.

    While advanced bio-based production is seen as a great opportunity in several richly forested countries in the boreal belt, industrial operators there are up against a practical problem. A large part of the Canadian, Swedish and Finnish forest resource is made up of coniferous tree species whose woody composition is highly complex and requires harsh treatment before rendering its cellulose, hemicellulose and lignin components in separate parts, which is a requirement in most bio-based production. This harsh pre-treatment means toxic elements are left in the biomass slurry resulting from the process, whose impact must be reduced for efficiency to be achieved in the conversion step to fuels and chemicals.