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ePaper created 2017-03-14, 10:25:37 | version 1.49.03
CHEMISTRY AND PROCESS INDUSTRY hemicellulose cellulose lignin woody biomass (waste material / co-products) 1 KOMBICHEMPRO – FINE AND PLATFORM CHEMICALS MADE OF WOOD G e rd U nke lb a ch, M o r i t z L e s chinsk y, K at ja Pat z s ch, Dani e la P u f k y - H e inr i ch, Sus ann e Z ib e k The aim of the joint project KomBiChemPro is to combine CBP has adapted the pulping parameters to meet the neces- various development activities for the material use of lignocellulose-containing biomass in an integrated bioreinery concept. The most important aspect is the production of marketable products using robust processes and eficient pro- cess management in order to ensure broad applicability and competitiveness against petrochemically produced materials and chemicals. On the basis of the work of the partners involved, the sub- processes are combined at one location, mapped in suficient dimensions and accounted. This is the only way to obtain reliable statements on the entire value chain from raw mate- rial processing and conversion to product separation. The en- gineering data as well as the material and energy lows allow conclusions to be drawn about the scalability of the processes and make it possible to fully exploit the potential of process integration. Chemical pulp from organosolv digestion The basis of the project is the physico-chemical digestion of wood with alcohol-water mixtures (organosolv process), making it possible to obtain all three main components of lignocellulose (i.e. cellulose, hemicellulose, and lignin). As an alternative to the production of glucose, the production of ibers and chemical pulp with this process is another economi- cally viable option [1]. However, the investigations by Peter and Höglinger contain considerable potential for optimiza- sary requirements for yield and purity of cellulose, but also of other products. Chemical conversion of hemicellulose and lignin The proitable value added from hemicellulose is still an important prerequisite for the economic viability of a lignocel- lulose bioreinery, in addition to the utilization of lignin. The German Biomass Research Center (DBFZ) was able to show that a conversion of hemicellulose to biogas is possible with high yields. However, higher-quality material use is more economically viable. Hydrothermal processes are well-suited for conversion of aqueous systems (the hemicellulose fraction in this case), since water is simultaneously a solvent and a reaction partner in these processes [2, 3, 4]. The aim is to select the conditions so that sugars or furans can be selectively recovered from the hemicellulose fraction. In subsequent processing steps, they can then be separated as starting materials for fermentation or as basic chemicals. The investigations on the reaction patterns of real hemicellu- lose fractions carried out at the DBFZ laid the foundations for scaling up to the mini-plant scale at Fraunhofer CBP. In recent months, process windows were identiied for the target products. tion, especially with regard to the process conditions during pulping and bleaching. The quality and possible applications of lignin or hemicelluloses were also ignored. Therefore, the Fraunhofer Center for Chemical-Biotechnological Processes To increase the value, the organosolv lignins obtained by frac- tionation is converted into phenol fractions by base-catalyzed depolymerization, also under hydrothermal conditions. The process established at Fraunhofer CBP is further improved 8 6