For more than 100 years, scientists used concentrated hydrochloric acid (HCl) hydrolysis of biomass as an analytical method to determine the composition of the sugars, lignin and tall oils in ligno-cellulose.
Today, the CASE™ process yields and refines almost all of the theoretical sugars contained in lignocelluloses, the lignin and the extractives. Lignin is produced using a proprietary de-acidification process without consumption of water. The process is self-sufficient for energy consumption.
Pre-extraction of Biomass
Stora Enso Virdia has developed an effective pretreatment process that efficiently removes the extractives and ash present in all biomass. The presence of the extractives during concentrated acid hydrolysis can complicate the processes, reduce productivity and may contaminate the final product.
Separation and Refining
The sugar hydrolyzate and lignin exit the process as separate streams, and are de-acidified and refined. The hydrolyzate yields a stream of concentrated fermentable monomeric C5 and C6 sugars that can be used in a large number of food and feed fermentation applications, as well as renewable fuel and chemical applications. The resultant bone dry, low chlorides, low ash lignin solids have a significant energy value.