2,3-BDO Recovery via Acetalization Phase Separation
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Solution Overview
Problem
Current methods for the separation and recovery of biomass-derived 2,3-butanediol (2,3-BDO) from fermentation broth are energy-intensive and result in low yields due to its aqueous solubility and the need for high thermal energy, as well as challenges in downstream processing, including membrane fouling and solvent usage.
Innovation Solution
A method involving acetalization with an aldehyde in the presence of a heterogeneous catalyst to form cyclic acetals (dioxolanes), followed by trans-acetylation and distillation, which allows for the phase separation and high-purity recovery of 2,3-BDO, with the option to convert dioxolanes into methyl ethyl ketone and butanal for recycling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If distillation is used to separate 2,3-BDO from fermentation broth, then separation is achieved, but high thermal energy is required making the process energy-intensive and less economical
Solution Approach 1:
The invention changes the physical-chemical parameters of the system by forming cyclic acetals (dioxolanes) through reaction with aldehydes. This chemical transformation alters the volatility and solubility characteristics of 2,3-BDO, enabling separation at lower temperatures via liquid-liquid extraction instead of high-energy distillation
Solution Approach 2:
Aldehydes serve as intermediary substances that react with 2,3-BDO to form cyclic acetals. These intermediates enable phase separation by creating a distinct organic phase that can be easily separated from the aqueous fermentation broth, avoiding direct thermal separation
2Productivity
If conventional homogeneous catalysts are used in reactive extraction, then extraction efficiency is improved, but corrosive strongly acidic environment requires advanced alloys or coatings making the process costly
Solution Approach 1:
The invention employs solid heterogeneous catalysts that are stable, non-corrosive, and can be easily separated and reused. These catalysts eliminate the need for expensive corrosion-resistant equipment while maintaining high catalytic activity throughout the extraction process
Solution Approach 2:
The invention replaces homogeneous liquid-phase catalysts with heterogeneous solid-phase catalysts. This substitution eliminates the corrosive liquid acid environment while providing easier catalyst separation and reuse, reducing equipment cost and complexity
3Use of energy by moving object
If liquid-liquid extraction is used for 2,3-BDO purification, then energy consumption is reduced, but membrane fouling and solvent usage issues arise
Solution Approach 1:
Aldehydes act as intermediaries that form cyclic acetals with 2,3-BDO, creating a distinct organic phase that separates cleanly from the aqueous phase. This intermediary approach enables efficient liquid-liquid extraction without membrane fouling or complex downstream processing
Solution Approach 2:
The invention utilizes liquid-liquid phase separation by forming cyclic acetals that partition into an organic phase. This phase transition approach enables easy separation of 2,3-BDO from fermentation broth without membranes or complex processing equipment
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 process achieves high-purity 2,3-BDO recovery with at least 90% isolated yield, reducing energy consumption and downstream processing challenges, and enables the recycling of butanal, enhancing the economic and environmental sustainability of the process.
Implementation Method 1
acetalization with an aldehyde in the presence of a heterogeneous catalyst forming cyclic acetal (dioxolane)
Implementation Method 2
Upon coordination to form cyclic acetals (dioxolane), the product phase separates from the 2,3-BDO/water mixture
Implementation Method 3
Trans-acetylation of dioxolane with methanol (methanolysis) followed by distillation of acetal yielding high purity 2,3-BDO
Data Source
AI summary
The invention relates to a two-way approach to isolate, recover and upgrade 2,3-Butanediol (2,3-BDO) from fermentation broth. A complete separation and recovery process for 2,3-BDO using acetalization and trans-acetalization sequence. Acetalization with butyraldehyde using heterogeneous catalysts, either Amberlyst-15® or Nafion NR50®, efficiently isolates 2,3-BDO as phase-separated protected dioxolane. The approach provides significant process advantages with easy product recovery and high recyclability of the catalyst. Trans-acetalization of dioxolane with methanol (methanolysis) followed by distillation of acetal, yielded very high purity 2,3-BDO with about 90% isolated yield. Alternatively, dioxolane is used in a process direct to methyl ethyl ketone (MEK) as a BDO synthon allowing for recovery of the aldehyde.