Glycerol to Lactic Acid Conversion via Copper Catalyst
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Solution Overview
Problem
Current methods for producing lactic acid from glycerol are inefficient, requiring high temperatures, high pressures, or the use of hydrogen or oxygen, which lead to low selectivity and high costs, and often involve complex separation steps and corrosion issues.
Innovation Solution
A novel process using a dehydrogenation catalyst, such as a copper-containing catalyst, in combination with an alkaline component at lower temperatures (around 250°C) to convert glycerol to lactic acid without the need for hydrogen or oxygen, achieving high selectivity and conversion rates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If hydrothermal conversion is used to convert glycerol to lactic acid, then conversion can proceed without separation steps, but severe corrosion occurs due to alkaline medium at high temperature
Solution Approach 1:
The patent changes the temperature parameter from near-critical water temperature (573 K) to subcritical temperature (373-473 K), which reduces the corrosiveness of the alkaline medium while maintaining catalytic activity for glycerol conversion to lactic acid
Solution Approach 2:
The patent introduces a catalyst (metal or metal oxide) as an intermediary to enable the conversion reaction to proceed at lower temperatures without requiring extreme alkaline conditions, thus reducing corrosion while maintaining high conversion efficiency
2Productivity
If high temperature hydrothermal process is used, then glycerol conversion to glyceraldehyde is efficient, but decomposition of pyruvaldehyde and lactic acid occurs, reducing selectivity
Solution Approach 1:
The patent optimizes the temperature parameter to subcritical range (373-473 K) which is sufficient for catalytic conversion of glycerol to glyceraldehyde but below the decomposition threshold for pyruvaldehyde and lactic acid, thereby achieving both high conversion and high selectivity
Solution Approach 2:
The patent uses a catalyst to maintain continuous efficient conversion at lower temperatures, preventing the decomposition that would occur at high temperatures while sustaining high productivity through sustained catalytic activity
3Manufacturing precision
If aerobic oxidation with Au-Pt/TiO2 catalyst is used, then high selectivity (86%) is achieved, but high molar ratio of NaOH to glycerol and oxygen are required
Solution Approach 1:
The patent changes the redox conditions from aerobic oxidation to anaerobic catalytic conversion, eliminating the need for oxygen and reducing NaOH consumption while maintaining high selectivity through catalytic pathways that proceed without external oxidants
Solution Approach 2:
The catalyst system enables the reaction to proceed autonomously without requiring external oxygen supply or high concentrations of base, using the substrate itself and catalytic activity to drive the transformation with minimal reagent addition
4Productivity
If hydrogen at high pressure (40-60 bar) is used for hydrogenolysis, then conversion can proceed, but low selectivity to lactic acid (40-60%) is achieved
Solution Approach 1:
The patent changes the pressure condition from high pressure (40-60 bar) to atmospheric or low pressure conditions, and modifies the catalyst system to achieve high selectivity to lactic acid while maintaining good conversion rates without requiring extreme pressure
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 yields of lactic acid with high selectivity and conversion rates under milder conditions, reducing production costs and eliminating the need for reductants or oxidants, while being more environmentally friendly and less prone to corrosion.
Implementation Method 1
a dehydrogenation catalyst, such as a copper-containing catalyst, in combination with an alkaline component at lower temperatures (around 250°C) to convert glycerol to lactic acid
Implementation Method 2
The alkaline component, also present in the reaction mixture, converts the glyceraldehyde to lactic acid
Data Source
AI summary
A process for producing lactic acid from glycerol using a reaction mixture comprising glycerol, a dehydrogenation catalyst (preferably a copper-based catalyst), an alkaline component, and water.