Post-treating Polyol Esters via Low-Temperature Water Addition
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Solution Overview
Problem
Current methods for post-treating polyol esters, such as steam treatment with an adsorbent, are time-consuming and can lead to undesirable degradation reactions, especially when producing polyol esters based on ether diols, and introduce salts that need to be removed, complicating the process and affecting product quality.
Innovation Solution
A batch process where polyol esters are produced by reacting polyols with excess aliphatic monocarboxylic acids in the presence of a Lewis acid catalyst and an adsorbent, followed by adding water at a temperature below the boiling point to convert the catalyst into easily separable products, avoiding basic-reacting compounds and minimizing thermal stress.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If steam treatment with adsorbent is used for post-treating polyol esters, then the catalyst can be removed, but the process becomes time-consuming and causes thermal degradation
Solution Approach 1:
The patent changes the temperature parameter from high-temperature steam treatment (typically 100-200°C) to low-temperature water treatment (below boiling point, typically 20-80°C). This parameter change allows catalyst conversion to occur at milder conditions, reducing thermal stress on the polyol ester while maintaining effective catalyst removal through subsequent filtration
Solution Approach 2:
The patent introduces water as an intermediary substance that converts the Lewis acid catalyst into a water-soluble or easily separable form. This intermediary approach allows catalyst removal without requiring high-temperature steam treatment, thereby reducing residence time and thermal degradation while achieving the same purification goal
2Reliability
If steam treatment is used for catalyst removal, then catalyst can be destroyed, but undesirable degradation reactions occur especially with ether diols
Solution Approach 1:
The patent changes the temperature parameter from high-temperature steam treatment to low-temperature water treatment (below boiling point). This parameter change prevents thermal degradation of the polyol ester, particularly protecting ether diol structures from cleavage reactions that occur under high-temperature steam treatment conditions
Solution Approach 2:
The patent converts the typically harmful high-temperature steam treatment into a beneficial low-temperature water treatment process. By using water at below-boiling temperatures, the process achieves catalyst deactivation while simultaneously preventing the harmful degradation reactions that would otherwise occur, turning a potentially damaging process into a protective one
3Manufacturing precision
If alkaline treatment is used after water treatment, then residual acid can be removed, but salts are introduced that complicate the process
Solution Approach 1:
The patent extracts and removes the excess carboxylic acid during the reaction process itself, before the water treatment step. By controlling the reaction conditions and removing unreacted acid early in the process, the need for subsequent alkaline treatment is eliminated, avoiding salt formation and simplifying the overall process while maintaining manufacturing precision
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 process significantly reduces the residence time of the crude ester in the production plant, increases the space-time yield, and produces polyol esters with improved quality by reducing residual acid, water content, hydroxyl number, and metal content, thus meeting specification values and enabling broader applications without the need for alkaline treatments.
Implementation Method 1
adding water at a temperature below the boiling point of water at the respective pressure to convert the catalyst into easily separable products
Implementation Method 2
reacting polyols with excess aliphatic monocarboxylic acids in the presence of a Lewis acid catalyst and an adsorbent
Data Source
AI summary
The present invention relates to a method for post-treating polyol esters, produced by reacting polyols with linear or branched aliphatic monocarboxylic 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 a catalyst, and in the presence of an adsorbent by removing the water which formed. The obtained raw ester is added to water at a temperature below the boiling point of water at the respective pressure and the raw ester mixed with water is post-treated thus preventing alkaline reaction compounds.