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Item type:Publication, Access status: without files , Comparison of different pretreatment methods for lignocellulosic materials. Part I: Conversion of rye straw to valuable productsThe conversion of lignocellulose to valuable products requires I: a fractionation of the major components hemicellulose, cellulose, and lignin, II: an efficient method to process these components to higher valued products. The present work compares liquid hot water (LHW) pretreatment to the soda pulping process and to the ethanol organosolv pretreatment using rye straw as a single lignocellulosic material. The organosolv pretreated rye straw was shown to require the lowest enzyme loading in order to achieve a complete saccharification of cellulose to glucose. At biomass loadings of up to 15% (w/w) cellulose conversion of LHW and organosolv pretreated lignocellulose was found to be almost equal. The soda pulping process shows lower carbohydrate and lignin recoveries compared to the other two processes. In combination with a detailed analysis of the different lignins obtained from the three pretreatment methods, this work gives an overview of the potential products from different pretreatment processes.Publicationtype: Journal ArticleScopus© Citations 57 29 - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Access status: without files , Comparison of different pretreatment methods for lignocellulosic materials. Part II: Influence of pretreatment on the properties of rye straw ligninSeveral processes have been suggested to convert various types of lignocellulosic biomass into lignin products and saccharides. This paper evaluates the suitability of an organosolv process, a process using soda, a hydrothermal process and a process developed in this work, called the " Aquasolve process" for inclusion into a lignocellulosic biorefinery concept. Part II of this paper investigates the influence of the different pretreatment processes on the properties of rye straw lignin and evaluates their ability to produce high recoveries of high quality lignin. Specifications for high quality lignin products are defined and the isolated lignin fractions are analysed by Klason lignin, carbohydrate and ash content, elemental analysis, thermo-gravimetric analysis, 31P NMR, and size exclusion chromatography. The organosolv process shows the largest lignin recovery, followed by the soda and Aquasolve processes. Lignin products from the soda process, the Aquasolve process and with reservation the organosolv process show interesting properties for polymer applications.Publicationtype: Journal ArticleScopus© Citations 148 33 - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Access status: without files , Conversion of rye straw into fuel and xylitol: a technical and economical assessment based on experimental data(Elsevier, 2010-11-19); ; ; ; A contribution to the development of economically sustainable processes to obtain lignocellulosic bioethanol is presented. The simultaneous production of bioethanol and xylitol from rye straw is investigated, as this compound can become a realistic alternative to the transformation of xylose into ethanol. A complete process from the raw material to the end products is developed and simulated with respect to all major operations: hot liquid water pretreatment, fermentation of glucose to ethanol, fermentation of xylose to xylitol, separation and purification of both products. Calculations are based on experimental as well as on literature data. In particular, experimental data about the pretreatment and enzymatic hydrolysis steps previously obtained (Ingram et al., 2009) are used in order to achieve a realistic model that was then implemented using the software Aspen Plus™. The optimization of the process energy duties is carried out by means of the pinch technology analysis. Mass balances from the simulation are used in order to size the equipments and calculate the capital investment. Finally production costs and some financial indexes are estimated by an economical analysis. © 2010 The Institution of Chemical Engineers.Publicationtype: Journal Article25 - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Access status: without files , Process development for a multiproduct biorefineryThe combination of the thermal and enzymatic hydrolysis promises to be a suitable process for the conversion of lignocellulosic biomass, e.g., rye straw, into sugars, e.g., glucose, xylose, and lignin. The enzymatic hydrolysis of the solid residue after the thermal pretreatment was optimized achieving high glucose concentrations and high conversions of cellulose to glucose with a low enzyme consumption. The lignin of the thermal and enzymatic hydrolysis showed comparable results to the sulfur free lignins derived by the other pretreatments, thus, suitable for high quality lignin applications. The enzymatic hydrolysis was realized under pressure to achieve a lower enzyme consumption and shorter reaction time. Pressure ≤ 300 bar increased the thermal stability of the corresponding enzymes. Thus, elevated temperatures could be applied to increase the reaction rate. This is an abstract of a paper presented at the 7th European Congress of Chemical Engineering-7 and 19th International Congress of Chemical and Process Engineering CHISA 2010 (Prague, Czech Republic 8/28/2010-9/1/2010).Publicationtype: Conference Paper29