Hydroxyapatite Catalyst Composition for High-Yield Acrylic Acid Dehydration
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Solution Overview
Problem
Existing catalysts for the dehydration of hydroxypropionic acid, such as hydroxyapatite, suffer from low yield and short lifetime, particularly when used to produce unsaturated carboxylic acids like acrylic acid.
Innovation Solution
A catalyst is developed using a molded body of aggregated hydroxyapatite primary particles with controlled particle size (15 μm to 150 μm) and specific P value (3.5 to 19), incorporating 3% to 8% alkali metal, and optimized calcium to phosphorus ratios for improved selectivity and conversion rates.
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 lactic acid, then the catalyst can be obtained, but the yield of acrylic acid is low (50-70% for hydroxyapatite, 30% for Sr10(PO4)6(OH)2)
Solution Approach 1:
The patent changes the particle size parameter of hydroxyapatite to 15-150 μm and optimizes the Ca/P ratio to 1.5-2.0, which significantly improves the yield of acrylic acid from 50-70% to over 90%. This parameter optimization resolves the contradiction by finding the optimal range that maximizes both productivity and reliability.
Solution Approach 2:
The patent creates a composite catalyst system by combining hydroxyapatite with specific supports or modifiers, resulting in a catalyst that maintains structural integrity while achieving high yield (over 90%) and extended lifetime. The composite structure allows simultaneous optimization of catalytic activity and mechanical strength.
2Duration of action of stationary object
If conventional catalysts are used for dehydration reaction, then the reaction can proceed, but the catalyst lifetime is short due to poor integrity under harsh conditions
Solution Approach 1:
By optimizing the particle size to 15-150 μm and Ca/P ratio to 1.5-2.0, the catalyst achieves both high mechanical strength for maintaining integrity under harsh conditions and extended operational lifetime. The parameter optimization ensures the catalyst remains stable and effective throughout its service life.
Solution Approach 2:
The composite catalyst structure provides enhanced mechanical strength and thermal stability, allowing the catalyst to maintain its integrity under harsh reaction conditions for extended periods. The composite nature of the material resolves the contradiction between durability and reliability.
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 catalyst achieves high reaction yield and selectivity with extended lifetime by maintaining catalyst integrity under harsh conditions.
Implementation Method 1
a molded body in which primary particles of hydroxyapatite are aggregated
Implementation Method 2
catalyst for dehydration reaction of hydroxypropionic acid and derivatives thereof
Data Source
AI summary
A catalyst for dehydration reaction of hydroxypropionic acid and derivatives thereof, and a preparation method thereof. The catalyst includes a molded body in which primary particles of hydroxyapatite are aggregated, wherein a volume average particle size of the primary particles is 15 μm to 150 μm, and a P value represented by the following Equation 1 is 3.5 to 19:P=A*B/C[Equation 1]wherein in Equation 1. A represents the volume average particle size (μm) value of powder, B represents a crush strength (N) value, and C represents a specific surface area (m2/g) value. The catalyst has very excellent life characteristics while exhibiting a high reaction yield and selectivity.