Syngas Fermentation Medium Component Reduction
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Solution Overview
Problem
Current fermentation processes for syngas require essential components at specific concentration levels, leading to high operational costs, especially at commercial scales, and there is a need to optimize ethanol productivity while reducing these component concentrations.
Innovation Solution
A fermentation process and medium are developed that maintain high ethanol productivity by reducing or eliminating previously essential components such as boron, manganese, molybdenum, and copper, while optimizing nutrient ratios like NH4+ to B, NH4+ to Mn, and other ratios, allowing for significant cost savings.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If essential medium components (boron, manganese, molybdenum, copper) are maintained at traditional concentration levels, then fermentation process stability is improved, but operational costs increase
Solution Approach 1:
The patent applies parameter changes by systematically reducing the concentration levels of essential medium components (boron, manganese, molybdenum, copper) from traditional levels to optimized lower levels. This principle resolves the contradiction by demonstrating that fermentation stability can be maintained while using reduced quantities of expensive components, thereby lowering operational costs without sacrificing process reliability
Solution Approach 2:
The patent extracts and removes certain medium components that were previously considered essential, specifically eliminating or reducing boron, manganese, molybdenum, and copper from the fermentation medium. This extraction approach allows the fermentation process to maintain stability with a simplified medium composition, reducing the quantity of substances required and thereby decreasing operational costs
2Quantity of substance
If medium components are reduced or eliminated, then operational cost savings are improved, but ethanol productivity may deteriorate
Solution Approach 1:
The patent optimizes parameter relationships by establishing specific weight ratios between remaining essential components (such as NH4+ to B, NH4+ to Mn, NH4+ to Mo, NH4+ to Cu, P to B, P to Mn, P to Mo, Mn to Cu, K to B, K to Mn, K to Mo, K to Cu ratios). These optimized parameter combinations ensure that ethanol productivity is maintained at high levels even when individual component concentrations are reduced, resolving the contradiction between cost savings and productivity
Solution Approach 2:
The patent enhances the efficiency of remaining medium components by optimizing their interactions and ratios. The optimized composition allows each remaining component to perform multiple functions more effectively, maintaining high ethanol productivity while using reduced quantities of substances, thereby achieving both cost savings and productivity goals
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 process achieves high ethanol productivity with reduced component concentrations, specifically achieving a specific space-time yield of at least 1 g ethanol/(L·day·gram cells) and maintaining operational efficiency even after component reductions, resulting in substantial operational cost savings.
Implementation Method 1
Anaerobic microorganisms can produce ethanol from carbon monoxide (CO) through fermentation of gaseous substrates
Data Source
AI summary
A process for fermenting syngas and a fermentation medium provides high ethanol productivity while removing medium components that were previously thought to be essential. The process is effective for providing a specific STY of at least about 1 g ethanol/(L·day·gram cells). In this aspect, the fermentation medium has less than about 1.04 ppm boron, less than about 0.16 ppm manganese, less than about 0.26 ppm molybdenum, or less than about 0.16 ppm copper.