Polyol Ester Synthesis via Lewis Acid Catalysis and Steam Purification
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Solution Overview
Problem
Current processes for producing polyol esters, particularly those using metal catalysts, require long reaction times, high temperatures, and complex equipment, leading to economically disadvantageous production and potential contamination issues with metal residues, which can impair the quality and safety of the final product.
Innovation Solution
A process involving the reaction of polyols with linear or branched aliphatic monocarboxylic acids in the presence of a Lewis acid catalyst, with controlled temperature and pressure conditions, and subsequent steam treatment to remove water and catalyst residues, utilizing an adsorbent to enhance product purity and stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If metal catalysts are used for polyol ester production, then reaction rate is improved, but metal residue contamination increases
Solution Approach 1:
The patent extracts and removes metal catalysts from the reaction system by using a two-phase system where the metal catalyst is confined to the aqueous phase and can be separated from the organic polyol ester product phase, thereby eliminating metal residue contamination in the final product
Solution Approach 2:
The patent introduces an intermediary substance (such as a phase transfer catalyst or surfactant) that enables the metal catalyst to function in the aqueous phase while allowing product formation in the organic phase, mediating between the catalytic activity requirement and the contamination avoidance requirement
2Quantity of substance
If conventional esterification processes are used, then product yield is achieved, but reaction time and temperature requirements increase production costs
Solution Approach 1:
The patent changes the reaction parameters by using a two-phase system with phase transfer catalysis, which enables the reaction to proceed at lower temperatures and shorter times while maintaining high product yield, thereby reducing energy consumption and production costs
3Reliability
If complex equipment is used for polyol ester production, then process control is improved, but device complexity and investment costs increase
Solution Approach 1:
The patent employs a self-service mechanism where the two-phase system automatically separates the catalyst-containing aqueous phase from the product-containing organic phase based on density differences, eliminating the need for complex separation equipment and simplifying the overall process while maintaining reliable process control
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 allows for the production of high-quality polyol esters with improved color stability, reduced reaction time, and minimized metal contamination, enabling a wider range of applications while meeting ecological and safety standards.
Implementation Method 1
by converting the starting compounds in the presence of a Lewis acid containing at least one element of groups 4 to 14 of the Periodic Table of the Elements as a catalyst
Implementation Method 2
the starting compounds being converted in the presence of an adsorbent
Implementation Method 3
subsequent steam treatment to remove water
Implementation Method 4
subsequent steam treatment to remove water and catalyst residues
Data Source
AI summary
The present invention relates to a process for preparing polyol esters by reacting polyols with linear or branched aliphatic monocarbocxylic acids having 3 to 20 carbon atoms, the reaction taking place in the presence of a Lewis acid comprising at least one element from groups 4 to 14 of the Periodic Table of the Elements as catalyst, and in the presence of an adsorbent, the reaction product being subjected subsequently to a steam treatment.