Supercritical CO2 Coffee Extraction for Aroma Retention
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Solution Overview
Problem
Existing coffee extraction methods lose valuable aromatization and bio-active products, resulting in undesirable flavor characteristics and rancid flavors in instant coffee products due to excess lipids, which are not effectively captured or retained.
Innovation Solution
A method involving breaking and grinding coffee beans, followed by a heat exchanger process, aroma evaporator, decanting, and additional separation steps to obtain coffee powders, liquids, aromatics, and bio-actives, with optional steps like vacuum de-aeration and lyophilization to reduce lipid content and preserve flavor.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of substance
If conventional coffee extraction techniques are used, then coffee products can be produced, but valuable aromatization and bio-active products are lost or wasted
Solution Approach 1:
The patent applies extraction by using a supercritical fluid (CO2) to selectively extract and capture aromatic compounds and bio-active substances from coffee beans. The supercritical fluid penetrates the coffee matrix and dissolves these valuable components, which are then separated and concentrated into a usable extract, preventing their loss in conventional processing
Solution Approach 2:
The patent utilizes parameter changes by transitioning CO2 between supercritical and gaseous states through controlled pressure and temperature changes. At supercritical conditions (high pressure and temperature), CO2 extracts aromatic compounds; upon pressure reduction, CO2 returns to gaseous state, leaving the extracted compounds behind for collection, thus capturing valuable by-products efficiently
2Reliability
If conventional coffee extraction techniques are used, then coffee products can be produced, but undesirable levels of degradation occur
Solution Approach 1:
The patent employs an inert atmosphere by using carbon dioxide as the extraction medium instead of oxygen-containing environments. CO2 is chemically inert under extraction conditions, preventing oxidation and degradation of sensitive aromatic compounds and bio-active substances, thereby maintaining quality consistency and preventing harmful degradation
Solution Approach 2:
The patent utilizes phase transitions of CO2 between supercritical and gaseous states to control the extraction and separation process. The phase change allows for gentle extraction without thermal degradation, as the supercritical fluid can be converted back to gas at low temperatures, preserving the integrity of heat-sensitive aromatic compounds
3Object-generated harmful factors
If conventional coffee extraction techniques are used, then coffee powders or liquids can be produced, but excess or undesirable quantities of lipids are present resulting in less flavorful and rancid flavors
Solution Approach 1:
The patent applies selective extraction by using supercritical CO2 to specifically target and extract aromatic compounds and bio-active substances while leaving lipids behind in the coffee matrix. The supercritical fluid's selective solubility allows it to dissolve desirable aromatic components without extracting excessive lipids, thereby reducing rancid flavors and improving taste
Solution Approach 2:
The patent uses parameter changes in pressure and temperature to control the selectivity of the extraction process. By adjusting these parameters, the supercritical CO2 can be tuned to preferentially extract aromatic compounds at lower concentrations while leaving lipids in the solid phase, thus reducing lipid content in the final product and preventing rancid flavors
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
The method enhances the retention of coffee by-products, reduces lipid presence, and improves flavor characteristics by capturing volatiles and aromatics, resulting in more flavorful and less rancid coffee products.
Implementation Method 1
adding the ground coffee beans to a heat exchanger
Implementation Method 2
optionally removing aromatics via an aroma evaporator
Implementation Method 3
separating solid material from liquid in a decanting step
Implementation Method 4
performing a vacuum de-aeration or evaporation step on the coffee beans
Implementation Method 5
subjecting certain coffee extraction products to an evaporation step and/or a lypophilization step
Data Source
AI summary
Methods and/or processes for obtaining coffee extracts and/or processing coffee beans. In certain embodiments, improved methods and/or processes for producing desirable and usable extracts from coffee beans which can be used for instant coffee type powders or liquids, for example. In certain other embodiments, improved coffee extraction techniques which permit or allow retainment or capture of desirable levels of aroma products and/or bio-actives from coffee beans.