Concepts

​As all markets are different, we focus on different concepts driven by different value drivers to ensure that projects fit the relevant market conditions.

The key difference in concepts relates to the usage of the C5 sugars derived from hemicellulose. These can be marketed as C5 molasses for biogas or animal feed, or fermented into 2G bioethanol to enter the transportation fuel markets. Which concept to choose, depends on how the different end products affect the project.
 

 

 

ExampleExample

​Below is shown a simple example of a concept driven by demand for the highest possible ethanol yield. This is the C5+C6 mixed sugar fermentation concept which is currently in operation at our Kalundborg demonstration plant.

​Here, C5 sugars are directed to the hydrolysis. With gene modified yeast, both C5 and C6 sugars are fermented and subsequently distilled to ethanol - for instance to be used as transportation fuel. Had C5 sugars been used for C5 molasses, C5 sugars would go directly for evaporation instead of enzymatic hydrolysis.

From fermentation and on, standard 1G technology and equipment can be used.

Value driven concepts 

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​By products

After distillation, the remaining lignin consists of both solid and liquid fractions. Solids are separated and can be used for either on-site or off-site power and heat production. If off-site, it will often pay to dry and pelletize the lignin to lower transportation costs and increase storability.

The liquid fraction is evaporated to produce a vinasse which can be used for biogas production while condensate is recirculated to earlier processes to reduce water consumption. In case C5 sugars are not been fermented, the output is C5 molasses rather than vinasse. Vinasse is in many ways similar to C5 molasses. However as C5 sugars have been fermented, the biogas potential of vinasse is lower than for C5 molasses.