Electrochemical Levulinic Acid Reduction for Selective Hydroxyvaleric Acid
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Solution Overview
Problem
There is a need for selective and efficient methods to upgrade levulinic acid into hydroxyvaleric acid, which is a versatile compound for producing biodegradable and biocompatible polyesters and other commodities, as existing methods are not sufficiently effective.
Innovation Solution
An electrochemical synthesis method is employed using a working electrode in an electrochemical cell with an aqueous electrolyte, applying a potential to reduce levulinic acid to hydroxyvaleric acid, utilizing electrodes such as Pb, Sn, In, Bi, Cd, Zn, or Sb, and controlling conditions like pH, temperature, and potential to achieve high selectivity and efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional methods are used to upgrade levulinic acid, then the process is simpler, but the selectivity and efficiency are insufficient
Solution Approach 1:
The patent applies parameter changes by systematically optimizing electrochemical conditions including potential range (−1.1 to −1.9 V vs. RHE), pH (3-14), temperature (0-120°C), and electrode material selection (Pb, Sn, In, Bi, Cd, Zn, Sb) to achieve high selectivity (50-100%) and Faradaic efficiency (50-100%) for hydroxyvaleric acid production from levulinic acid
2Productivity
If existing upgrading methods are used, then the equipment is simpler, but the conversion rate and production rate are low
Solution Approach 1:
The patent replaces conventional thermal or chemical upgrading methods with an electrochemical system, using electrical potential applied to working electrodes to drive the reduction of levulinic acid to hydroxyvaleric acid, achieving production rates of 5-1000 g L⁻¹ h⁻¹ with high conversion rates (0-100%)
3Reliability
If non-selective methods are used, then the process is easier to implement, but the Faradaic efficiency is low
Solution Approach 1:
The patent applies local quality by selecting specific electrode materials (Pb, Sn, In, Bi, Cd, Zn, Sb) with particular catalytic properties for the levulinic acid reduction reaction, and controlling local conditions at the electrode surface through pH adjustment (3-14) and potential control (−1.1 to −1.9 V vs. RHE) to maximize Faradaic efficiency (50-100%)
Solution Approach 2:
The patent employs dynamic control of electrochemical parameters including adjustable potential (−1.1 to −1.9 V vs. RHE), temperature (0-120°C), and pH (3-14) to optimize and maintain high Faradaic efficiency (50-100%) throughout the reaction process, allowing adaptation to different operating conditions
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 produces hydroxyvaleric acid with selectivity and Faradaic efficiency ranging from 50% to 100%, achieving high conversion rates and production rates, and can further convert hydroxyvaleric acid to gamma-valerolactone, suitable for polymer synthesis.
Implementation Method 1
applying a potential to electrochemically reduce the levulinic acid to form hydroxyvaleric acid
Data Source
AI summary
Disclosed herein are methods of electrochemical synthesis of hydroxyvaleric acid from levulinic acid. For example, disclosed herein are methods comprising electrochemical synthesis of hydroxyvaleric acid from levulinic acid, wherein the method is conducted in an electrochemical cell wherein a working electrode is in electrochemical contact with an aqueous electrolyte and levulinic acid, wherein the method comprises applying a potential to electrochemically reduce the levulinic acid to form hydroxyvaleric acid. Also disclosed herein are methods of synthesizing gamma-valerolactone from hydroxyvaleric acid, the method comprising acid-catalyzed esterification. Also disclosed herein are methods of use of the products produced by any of the methods herein.