Alkali Metal Doped Apatite Catalyst for Dehydration Yield
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Solution Overview
Problem
Existing methods for synthesizing unsaturated carboxylic acids, such as acrylic acid, from biomass-derived hydroxycarboxylic acids using dehydration reactions with catalysts like hydroxyapatite result in low yields, typically ranging from 50% to 70%, and are influenced by the concentration of reactants and temperature.
Innovation Solution
A catalyst comprising an apatite compound with an alkali metal, such as sodium or potassium, incorporated into its crystal structure, with a specific molar ratio of (Ca + alkali metal)/phosphorus between 1.58 and 1.73, and an alkali metal content of 0.2 to 3.0% by mass, is used to enhance the yield of unsaturated carboxylic acids through dehydration reactions at temperatures between 325°C and 400°C.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If hydroxyapatite or Sr10(PO4)6(OH)2 is used as a catalyst for dehydration reaction of hydroxycarboxylic acid, then the reaction can proceed, but the yield of unsaturated carboxylic acid is low (50-70% for hydroxyapatite, 30% for Sr10(PO4)6(OH)2)
Solution Approach 1:
The patent modifies the chemical composition parameters of the apatite catalyst by incorporating alkali metals (Na, K) at specific concentrations (0.2-3.0% by mass) and adjusting the (Ca+alkali metal)/P molar ratio to 1.58-1.73. This parameter optimization significantly improves the dehydration reaction yield from 50-70% to 75% or higher while maintaining catalytic stability.
Solution Approach 2:
The patent creates a composite catalyst by combining apatite with alkali metals within its crystal structure. This composite material integrates the base apatite framework with active alkali metal sites, achieving synergistic effects that enhance both activity and stability for the dehydration reaction of hydroxycarboxylic acids.
2Productivity
If conventional catalysts are used, then the synthesis process is simple, but the yield is low and highly dependent on reactant concentration and temperature
Solution Approach 1:
The patent optimizes specific compositional parameters of the apatite catalyst, including alkali metal content (0.2-3.0% by mass) and the (Ca+alkali metal)/P molar ratio (1.58-1.73), to achieve high yield (75% or more) while maintaining process simplicity and reducing sensitivity to operational conditions.
3Productivity
If petroleum-derived propylene is used as raw material, then acrylic acid can be produced efficiently, but the raw material supply is limited and depleting
Solution Approach 1:
The patent changes the raw material source from petroleum-derived propylene to biomass-derived hydroxycarboxylic acids (such as lactic acid). This parameter change in feedstock origin enables sustainable production while maintaining high conversion efficiency through the optimized apatite-alkali metal catalyst system.
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 significantly increases the yield of unsaturated carboxylic acids to 75% or higher, maintaining stability across varying reactant concentrations and temperature ranges, and reduces dependence on petroleum-derived materials.
Implementation Method 1
synthesizing an unsaturated carboxylic acid and/or a derivative thereof from a hydroxycarboxylic acid and/or a derivative thereof by a dehydration reaction
Implementation Method 2
synthetic catalyst for synthesizing an unsaturated carboxylic acid and/or a derivative thereof from a hydroxycarboxylic acid and/or a derivative thereof
Data Source
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AI summary
It is an object of the present invention to provide a catalyst, which solves a problem in that when an unsaturated carboxylic acid or a derivative thereof has been conventionally synthesized from a hydroxycarboxylic acid or a derivative thereof by a dehydration reaction using a catalyst, the yield has been low, and which is capable of synthesizing the unsaturated carboxylic acid or a derivative thereof at a high yield, and also to provide a synthetic method capable of synthesizing an unsaturated carboxylic acid or a derivative thereof at a high yield. A synthetic catalyst for synthesizing an unsaturated carboxylic acid and/or a derivative thereof from a hydroxycarboxylic acid and/or a derivative thereof by a dehydration reaction, wherein the synthetic catalyst comprises an apatite compound containing an alkali metal in a crystal structure thereof, and a method for synthesizing an unsaturated carboxylic acid and/or a derivative thereof, which method comprises contacting the aforementioned synthetic catalyst with the hydroxycarboxylic acid and/or a derivative thereof, so as to synthesize the unsaturated carboxylic acid and/or a derivative thereof by a dehydration reaction.