V-Ti-P Catalyst Preparation Using Water-Soluble Titanium Salts
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Solution Overview
Problem
Current catalysts for producing 2,3-unsaturated carboxylic acids, such as acrylic acid, are inefficient due to water and methanol inhibition, and the preparation of vanadium-titanium-phosphorus mixed oxide catalysts is hazardous and not scalable for industrial use.
Innovation Solution
A catalyst composition comprising a mixed oxide of vanadium, titanium, phosphorus, and alkali metal, where the titanium component is derived from a water-soluble, redox-active organo-titanium compound, is prepared using a safer and more scalable method involving an aqueous solution, heat-treatment, and calcination, allowing for higher surface area and acidity, and improved activity with formaldehyde and acetic acid.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If titanium chloride is used to prepare V-Ti-P catalysts, then the catalyst can be prepared, but large quantities of hydrochloric acid fumes are generated making the process dangerous and not amenable to scale-up
Solution Approach 1:
The harmful titanium chloride component is extracted and replaced with water-soluble titanium salts (such as titanium sulfate or titanium nitrate), eliminating the source of hydrochloric acid fumes while retaining the necessary titanium component for catalyst functionality
Solution Approach 2:
Water-soluble titanium salts serve as an intermediary substance that provides titanium ions without generating harmful hydrochloric acid fumes, enabling safe and scalable catalyst preparation while maintaining catalytic activity
2Productivity
If conventional V-Ti-P catalysts are used, then the catalyst can be prepared, but the preparation method is hazardous and not amenable to industrial production
Solution Approach 1:
The hazardous titanium chloride step is extracted and removed from the preparation process, replacing it with safe water-soluble titanium salts that enable industrial-scale production without safety concerns
Solution Approach 2:
The chemical form of titanium precursor is changed from anhydrous titanium chloride to water-soluble titanium salts, fundamentally altering the preparation parameters to enable safe, scalable industrial production while maintaining catalyst performance
3Productivity
If water-containing formaldehyde sources are used, then the reaction can proceed, but water inhibits the condensation reaction reducing efficiency
Solution Approach 1:
The water inhibition effect is converted into a benefit by developing a catalyst that specifically tolerates and maintains activity in aqueous environments, allowing the use of water-soluble formaldehyde sources without significant efficiency loss
Solution Approach 2:
A composite catalyst system is created combining vanadium, titanium, phosphorus, and alkali metal components in specific ratios, where the synergistic interaction enhances water tolerance and maintains high condensation efficiency in aqueous formaldehyde sources
4Productivity
If methanol-containing formaldehyde sources are used, then the reaction can proceed, but methanol creates mixtures of acids and esters reducing product purity
Solution Approach 1:
The methanol side reaction issue is converted into a benefit by optimizing the catalyst's selectivity toward the desired condensation product, suppressing ester formation and achieving high product purity even with methanol-containing formaldehyde sources
5Productivity
If the catalyst surface area is increased, then the catalytic activity improves, but the preparation becomes more complex
Solution Approach 1:
The catalyst is designed with a porous structure that provides high surface area for enhanced catalytic activity, while the water-soluble preparation method simplifies the manufacturing process by eliminating complex handling requirements for hazardous materials
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 resulting catalysts exhibit higher yield and selectivity for acrylic acid production, are more active, and safer to produce, addressing the inefficiencies and scalability issues of existing methods.
Implementation Method 1
heat-treating, and calcination
Implementation Method 2
heat-treating, and calcination
Implementation Method 3
catalysts for generating acrylic acid from the condensation of formaldehyde and acetic acid
Data Source
AI summary
The invention relates to a catalyst composition comprising a mixed oxide of vanadium, titanium, and phosphorus modified with alkali metal. The titanium component is derived from a water-soluble, redox-active organo-titanium compound. The catalyst composition is highly effective at facilitating the vapor-phase condensation of formaldehyde with acetic acid to generate acrylic acid, particularly using an industrially relevant aqueous liquid feed.