Molten Salt Catalysts for Lactic Acid Dehydration
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Solution Overview
Problem
Current methods for producing acrylic acid from lactic acid in the liquid phase have low yields and selectivity, and there is a need for more efficient catalysts that can effectively dehydrate lactic acid to acrylic acid while minimizing energy use and CO2 emissions.
Innovation Solution
The use of molten salt catalysts comprising an ionic liquid with a bromide anion and an acid, such as tetrabutylphosphonium bromide and pyrophosphoric acid, which facilitates the dehydration of lactic acid to acrylic acid with higher yields and selectivity, achieving at least 30 mol% yield.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If gas phase dehydration method is used to produce acrylic acid from lactic acid, then the process can be implemented, but the yield and selectivity are low
Solution Approach 1:
The patent changes the physical state parameter from gas phase to liquid phase dehydration, and introduces specific catalyst compositions (metal salts with organic modifiers or molten salts with bromide anions) to optimize the reaction conditions, thereby improving both yield and selectivity of acrylic acid production from lactic acid
Solution Approach 2:
The patent employs composite catalyst systems combining metal salts (such as Cu, Ni, Co, Fe) with organic modifiers or molten salts containing bromide anions, creating a synergistic catalytic system that enhances the dehydration reaction efficiency and product selectivity
2Productivity
If gas phase dehydration is used, then acrylic acid can be produced, but energy consumption and CO2 emissions are high
Solution Approach 1:
The patent utilizes the liquid phase state for dehydration reaction, which operates at lower temperatures compared to gas phase processes, thereby reducing energy consumption while maintaining effective catalysis through liquid-phase soluble catalysts
Solution Approach 2:
By changing the reaction phase from gas to liquid and optimizing catalyst parameters, the patent achieves effective dehydration at lower temperatures, reducing both energy consumption and associated CO2 emissions
3Productivity
If traditional catalysts are used in liquid phase, then the process can run, but yields and selectivity remain insufficient
Solution Approach 1:
The patent develops composite catalyst systems combining metal salts (Cu, Ni, Co, Fe) with organic modifiers or molten salts containing bromide anions, where the synergistic interaction between components enhances both yield and selectivity of acrylic acid formation
Solution Approach 2:
The patent introduces specific local catalytic properties through bromide anion-containing molten salts or metal salt complexes, creating localized active sites that promote selective dehydration while minimizing side reactions
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 approach results in higher yields and selectivity of acrylic acid production, reducing energy consumption and CO2 emissions compared to traditional gas phase dehydration methods, while also offering a more sustainable alternative to fossil-derived acrylic acid.
Implementation Method 1
The use of molten salt catalysts comprising an ionic liquid with a bromide anion and an acid, such as tetrabutylphosphonium bromide and pyrophosphoric acid, which facilitates the dehydration of lactic acid to acrylic acid with higher yields and selectivity
Data Source
AI summary
Catalysts for the dehydration of lactic acid, lactic acid derivatives, or mixtures thereof to acrylic acid, acrylic acid derivatives, or mixtures thereof in liquid phase comprising an ionic liquid (IL) and an acid are provided.