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Project description:

Project no:
Extraction of valuable compounds by Dimethylether
1st project leader:
Kruse, Andrea - Department of Conversion Technologies of Biobased Resources, Institute of Agricultural Engineering, University of Hohenheim, Stuttgart
2nd project leader
I. Introduction
The extraction with dimethylether is a suitable method to extract valuable compounds from wet biomass. It is also useful to remove the water from the biomass. Many residues from agricultural and food industry includes a lot of fats and oil, which could be removed. This could be part of a biorefinery concept, in which the residual biomass after extraction may be further converted. The advantage of dimethylether is that it can be completely removed from the products. (See (Bauer und Kruse 2019) and literature cited therein). Bauer und Kruse (2019) also suggests to use the extraction as early processing step of a biorefinery, in which not only fats but also other, if possible high-value products are produced.

II. Aims of the studies
Basing of the knowledge summarized above the aims of this project are:

a) Building-up a value chain for one or several selected residual biomass feedstock, which includes the extraction with dimethylether.

b) Basing on that: Optimization of the extraction with dimethylether as part of a biorefinery concept.

c) Process design of this extraction in view of the industrial application.
Bauer, M. C.; Kruse, A. (2019): The use of dimethyl ether as an organic extraction solvent for biomass applications in future biorefineries: A user-oriented review. In: Fuel 254.

Gutiérrez Ortiz, F. J.; Kruse, A.; Ramos, F.; Ollero, P. (2019): Integral energy valorization of municipal solid waste reject fraction to biofuels. In: Energy Conversion and Management 180, S. 1167–1184. DOI: 10.1016/j.enconman.2018.10.085.

Jung, D.; Körner, P.; Kruse, A. (2019): Kinetic study on the impact of acidity and acid concentration on the formation of 5-hydroxymethylfurfural (HMF), humins, and levulinic acid in the hydrothermal conversion of fructose. In: Biomass Conversion and Biorefinery. DOI: 10.1007/s13399-019-00507-0.

Jung, D.; Zimmermann, M.; Kruse, A. (2018): Hydrothermal Carbonization of Fructose: Growth Mechanism and Kinetic Model. In: ACS Sustainable Chemistry and Engineering 6 (11), S. 13877–13887. DOI: 10.1021/acssuschemeng.8b02118.

Körner, P.; Jung, D.; Kruse, A. (2018): The effect of different Brønsted acids on the hydrothermal conversion of fructose to HMF. In: Green Chemistry 20 (10), S. 2231–2241. DOI: 10.1039/c8gc00435h.

Körner, P.; Jung, D.; Kruse, A. (2019): Influence of the pH Value on the Hydrothermal Degradation of Fructose. In: ChemistryOpen 8 (8), S. 1121–1132. DOI: 10.1002/open.201900225.
Methods that will be used:
a) Experimental investigation. In the lab an apparatus for the extraction with dimethylether available. In addition, several different analytical methods are available there to analyze solids, including TGA-GC-MS, BET and FTIR. Other methods, e.g. NMR are available in the core facilities. The composition of the liquid phase could be measured by HPLC, GC, IC and other methods. Additional methods are also here available in the core facilities.

b) The processes are planned to be described by kinetic modelling and/or process simulation. Here some experiences and the necessary software is available (Jung et al. 2018; Jung et al. 2019; Körner et al. 2018, 2019; Gutiérrez Ortiz et al. 2019)
Collaboration partners:
Professors of the Institute of Food Processing, University of Hohenheim

Prof. N. Dahmen, KIT

Prof. Zhu Wei, Hohai University
Expected candidate‘s qualification:
M.Sc chemical engineering or similar fields
Very good English
Hydrothermal carbonization, N-fertilizer, supercaps, electrodes, n-doped carbon materials