Biomass conversion to mixed alcohol fuels using the MixAlco process.
M T Holtzapple1, R R Davison, M K Ross
1Department of Chemical Engineering, Texas A&M University, College Station, TX 77843-3122, USA. MTH4500@CHENNOV1.TAMU.EDU
Applied Biochemistry and Biotechnology
|August 12, 2004
Summary
The MixAlco process converts biodegradable waste into mixed alcohol fuels. This technology offers a cost-effective solution for waste management and fuel production, with potential for significant return on investment.
Area of Science:
- Biotechnology and Biofuel Production
- Chemical Engineering
- Waste Management
Background:
- Biodegradable waste presents a significant disposal challenge globally.
- Developing sustainable and economically viable methods for waste valorization is crucial.
- Existing biofuel technologies often have limitations in feedstock flexibility or cost-effectiveness.
Purpose of the Study:
- To present the MixAlco process, a patented technology for converting diverse biodegradable materials into mixed alcohol fuels.
- To detail the key steps involved in the MixAlco process, from feedstock treatment to final alcohol production.
- To evaluate the techno-economic feasibility of the MixAlco process under various tipping fee scenarios.
Main Methods:
- Feedstock treatment with lime to enhance digestibility.
- Fermentation by a mixed microbial culture to produce carboxylic acids.
- Neutralization to carboxylate salts, followed by concentration and drying.
- Thermal conversion of carboxylate salts to ketones, then hydrogenation to alcohols.
Main Results:
- The MixAlco process successfully converts various biodegradable materials into mixed alcohols (2-propanol to 7-tridecanol).
- Laboratory-scale validation of all process steps has been achieved.
- Techno-economic modeling indicates profitability, with potential for 60% ROI at $126/dry tonne tipping fees.
Conclusions:
- The MixAlco process is a technically proven and economically viable technology for producing mixed alcohol fuels from diverse waste streams.
- Favorable tipping fees significantly enhance the economic returns of the MixAlco process.
- The process offers a sustainable pathway for waste valorization and renewable fuel generation.
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