ZSM-5 Adsorption Beds for BDO Fermentation Broth Separation
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Solution Overview
Problem
Existing separation technologies for 2,3-butanediol (BDO) from fermentation broths face challenges such as high energy consumption, fouling of membranes, and difficulty in scaling due to the presence of unreacted sugar feedstock, solid/dissolved debris, and fermentation byproducts, making conventional separations uneconomical.
Innovation Solution
An adsorption system utilizing zeolite ZSM-5 (MFI) sorbent beds with a size of 200-250 nm, achieving high uptake (80-95 g/kg) and selectivity (10-25) for BDO, coupled with a cyclic operation of sorbent beds to continuously process fermentation broths, reducing energy demand and improving separation efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If conventional separation technologies (distillation, liquid-liquid extraction, membrane distillation) are used to separate BDO from fermentation broth, then separation can be achieved, but energy consumption is high and membranes are subject to fouling
Solution Approach 1:
The patent replaces conventional mechanical separation systems (distillation columns, membrane units) with an adsorption system using zeolite sorbents. This substitution eliminates the need for high-energy thermal processes and avoids membrane fouling issues, achieving BDO separation through selective adsorption onto the sorbent material.
Solution Approach 2:
The patent employs zeolite sorbents with controlled pore structures (200-250 nm size) to selectively adsorb BDO from the fermentation broth. The porous nature of the zeolite allows selective permeation and adsorption of BDO molecules while excluding other components, providing both high separation efficiency and resistance to fouling.
2Productivity
If conventional separation methods are applied to fermentation broth with unreacted sugar feedstock, solid/dissolved debris, and fermentation byproducts, then separation can be attempted, but scaling is difficult and results are uneconomical
Solution Approach 1:
The patent modifies the operational parameters of the adsorption system, including sorbent particle size (200-250 nm), feed flow rates, and contact times, to optimize performance with complex fermentation broths. These parameter adjustments enable the system to handle unreacted sugars, debris, and byproducts effectively while maintaining scalability.
Solution Approach 2:
The patent uses zeolite sorbents with specific local properties (pore size distribution, surface area, chemical composition) that are optimized for selective BDO adsorption. The local quality of the sorbent material allows it to distinguish between BDO and other components in the complex broth, enabling efficient separation without requiring complex multi-stage processing systems.
3Quantity of substance
If zeolite sorbent beds with size 200-250 nm are used, then uptake (80-95 g/kg) and selectivity (10-25) for BDO are achieved, but the system requires cyclic operation to continuously process broths
Solution Approach 1:
The patent divides the adsorption system into multiple sorbent beds that can operate in cyclic fashion. While one bed is adsorbing BDO, another bed is being regenerated, allowing continuous processing. This segmentation of the separation function across multiple units simplifies the overall operation compared to a single bed requiring complete regeneration cycles.
Solution Approach 2:
The patent implements a cyclic operation where multiple sorbent beds are staggered in their adsorption and regeneration cycles. This ensures that at least one bed is always in the adsorption phase, providing continuous BDO removal from the fermentation broth without interruption, thereby maintaining high productivity.
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 system achieves high recovery (>90%) and purity (>95%) of BDO with reduced energy consumption, eliminating the need for downstream dehydration reactors and distillation columns, thereby enhancing the biofuel manufacturing process.
Implementation Method 1
a first sorbent bed attached to the feed line, the first sorbent bed configured to adsorb the biofuel precursor; a second sorbent bed attached to the feed line, the second sorbent bed configured to adsorb the biofuel precursor
Data Source
AI summary
Disclosed herein are adsorption systems and processes and adsorbent materials used therein. The disclosed systems comprise a feed line configured to provide a feed stream comprising a biofuel precursor, a biomass byproduct, and water; a first sorbent bed attached to the feed line; a second sorbent bed attached to the feed line; a raffinate line attached to both the first sorbent bed and the second sorbent bed, the raffinate stream comprising the biomass byproduct and water, and an extract line attached to both the first sorbent bed and the second sorbent bed, the extract stream comprising the biofuel precursor.