Fermented Biomass Packing for Ethanol Distillation
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Solution Overview
Problem
Current methods for separating ethanol from fermented biomass, such as crushing, pressing, or vacuum stripping, are inefficient, recovering only about 50% of ethanol and producing ethanol with low concentrations (30-40% ABV), which are not suitable for higher-value applications like fuel or cooking.
Innovation Solution
Using ethanol-rich fermented biomass as packing material in a vertical distillation column, where water is added to the bottom and heated to produce vapor, and the vapor is cooled and condensed at the top, with a fraction of the ethanol-rich liquid reintroduced to the column, allowing for simultaneous heating, cooling, and reflux to achieve higher ethanol concentrations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If crushing or pressing is used to separate ethanol from fermented biomass, then the process is simple and quick, but only about 50% of ethanol is recovered
Solution Approach 1:
The patent applies phase transition by heating water to produce vapor that rises through the fermented biomass, causing ethanol to vaporize and then condense in the condenser. This phase change process (liquid→vapor→liquid) enables complete ethanol recovery without leaving residue in the biomass, achieving 100% recovery rate.
Solution Approach 2:
The distillation column is segmented into distinct functional zones: water addition zone at the bottom, fermentation biomass packing zone in the middle, and condensation zone at the top. This segmentation allows each zone to perform its specific function efficiently, with vapor rising through controlled pathways for complete ethanol separation.
2Quantity of substance
If vacuum stripping is used to separate ethanol, then separation is achieved, but the ethanol concentration is only 30-40% ABV which is insufficient for fuel applications
Solution Approach 1:
The system uses repeated phase transitions of water (liquid→vapor→liquid) to create a continuous distillation process. The vaporized water carries ethanol vapor upward through the column, and the condenser converts this mixed vapor back to liquid, progressively concentrating ethanol until it reaches 95-98% ABV suitable for fuel applications.
Solution Approach 2:
The patent implements continuous operation where water is continuously added to the bottom, vaporized, passed through the biomass, condensed at the top, and the concentrated ethanol is continuously collected. This continuous cycle maintains steady-state operation and achieves high concentration ethanol production efficiently.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This method efficiently recovers ethanol at higher concentrations (up to 98% ABV), making it suitable for use in generators, internal combustion engines, and cooking, while reducing energy costs and environmental impact.
Implementation Method 1
heating the bottom of the vertical distillation column to boil the water, thereby producing a bottom vapor
Implementation Method 2
cooling the top of the vertical distillation column to condense a top vapor, thereby producing an ethanol-rich top liquid
Implementation Method 3
packing the ethanol-rich fermented biomass as distillation packing into a vertical distillation column
Data Source
Figure 1
AI summary
A method for separating ethanol from fermented biomass is provided. Fermented biomass that is rich in ethanol is used directly as packing material in a distillation column, and a small amount of water at the bottom of the column is used to efficiently transfer heat to the biomass at the bottom of the column. The fermented biomass packing has a high ratio of surface area to volume, making an efficient packing material. As vapor condenses on the biomass, diffusion of ethanol/water vapor from the body of the biomass enriches the ethanol concentration at the surface of the biomass. Droplets containing lower concentrations of ethanol drip downwards from the biomass, and vapors containing higher concentrations of ethanol rise upwards from the biomass, resulting in a higher concentration of ethanol at the top of the column than was initially in the biomass.