Alkoxylation Catalyst Composition with BHT Antioxidant
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Solution Overview
Problem
Alkoxylation reactions involving alkaline earth metal-based catalysts face issues such as oxidation of alkoxylated alcohols during transportation, difficulty in uniform mixing of antioxidants, and reduced reaction efficiency due to high vapor pressures, which lead to reactor pressure buildup and isomerization of terminal double bonds.
Innovation Solution
A catalyst composition is developed by reacting an alkoxylated alcohol mixture with calcium hydroxide, a carboxylic acid, and an inorganic acid, followed by propoxylation, and incorporating butylated hydroxytoluene (BHT) as an antioxidant, allowing for lower reaction temperatures and preventing oxidation, while maintaining the stability of terminal double bonds.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If high temperature heating is applied to maintain alkoxylates in liquid form for transportation, then pumpability is improved, but oxidation rate increases
Solution Approach 1:
The antioxidant BHT is incorporated into the catalyst composition before the alkoxylation reaction begins, so that antioxidant protection is already in place during product formation and subsequent handling, preventing oxidation before it can occur during heating and transportation
2Object-affected harmful factors
If antioxidant is added to final product for loading into tank cars, then oxidation protection is improved, but mixing uniformity deteriorates
Solution Approach 1:
The antioxidant BHT is merged with the catalyst composition during catalyst preparation, combining multiple functions (catalysis and antioxidant protection) into a single integrated system that ensures uniform distribution without requiring separate mixing operations
3Reliability
If reaction is conducted in closed vessel with high vapor pressure alcohols, then safety is improved, but head space for alkylene oxides deteriorates
Solution Approach 1:
The reaction temperature is reduced from typical high temperatures to a lower range of 50-100°C, which significantly decreases the vapor pressure of alcohol in the closed vessel, thereby increasing the available head space for alkylene oxide while maintaining safety
4Adaptability or versatility
If terminal double bonds are present in alcohol substrate, then product functionality is improved, but isomerization to internal double bonds occurs
Solution Approach 1:
The reaction temperature is reduced to 50-100°C, which suppresses the isomerization reaction that typically occurs at higher temperatures, thereby preserving the terminal double bond position and the desired product functionality
Solution Approach 2:
The specific catalyst composition with BHT acts as a selective mediator that promotes alkoxylation while suppressing isomerization, allowing the reaction to proceed without compromising the terminal double bond structure
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 composition significantly reduces oxidation of alkoxylated alcohols, improves reaction efficiency by allowing faster alkylene oxide addition, eliminates the need for water stripping, and preserves terminal double bonds, enhancing the transportation and yield of alkoxylated products.
Implementation Method 1
some alkoxylated alcohols are subject to oxidation... incorporating butylated hydroxytoluene (BHT) as an antioxidant... significantly reduces oxidation of alkoxylated alcohols
Implementation Method 2
the alkoxylation of alcohols... is one employing KOH as a catalyst... an alkylene oxide, e.g,. ethylene oxide, is reacted with a compound having an active hydrogen atom, e.g., an alcohol
Implementation Method 3
A catalyst composition is developed by reacting an alkoxylated alcohol mixture with calcium hydroxide, a carboxylic acid, and an inorganic acid... The catalyst composition significantly reduces oxidation of alkoxylated alcohols, improves reaction efficiency
Data Source
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AI summary
A process of preparing an alkoxylation catalyst wherein a catalyst precursor which is formed from an alkoxylated alcohol, calcium hydroxide, carboxylic acid, inorganic acid, and propylene oxide, is mixed with an antioxidant, preferably butylated hydroxyl toluene. A process of alkoxylation using the catalyst of the present invention.