Polyhydroxyl Ether Solvent Stabilizes Alkali Metal Aluminum Catalyst Solutions
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Solution Overview
Problem
Aluminum-based catalyst solutions in ethylene glycol tend to precipitate at low alkaline earth metal or alkali metal to aluminum molar ratios, especially at moderate temperatures, leading to inconsistent catalyst feed and product quality in polyester polymerization processes, and require elevated temperatures to maintain solubility, which is inefficient and costly.
Innovation Solution
The addition of a polyhydroxyl ether compound as a solvent for alkaline earth metal or alkali metal and aluminum catalyst systems improves solubility, allowing the catalyst solution to remain stable at ambient conditions and high aluminum concentrations, even at low molar ratios, without the need for agitation or elevated temperatures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the molar ratio of M:Al drops from 5:1 to 1:1, then catalytic activity is improved, but precipitation occurs at moderate temperatures
Solution Approach 1:
The patent changes the temperature parameter to maintain solution stability. By operating at elevated temperatures (above 100°C), the catalyst solution remains stable at low M:Al molar ratios (1:1 to 3:1), enabling high catalytic activity without precipitation. This parameter change resolves the contradiction between improved productivity and worsened stability.
2Productivity
If the aluminum concentration is increased above 3000 ppm, then catalyst efficiency is improved, but precipitation occurs
Solution Approach 1:
The patent applies parameter changes by elevating the temperature to maintain solution stability at high aluminum concentrations (above 3000 ppm). The elevated temperature prevents precipitation while allowing high catalyst efficiency, thus resolving the contradiction between improved productivity and worsened stability.
3Stability of the object's composition
If the catalyst solution is maintained at elevated temperatures, then solubility is improved, but energy consumption and equipment requirements increase
Solution Approach 1:
The patent applies partial action by maintaining elevated temperatures only during the catalyst feed phase, rather than throughout the entire polymerization process. The catalyst solution is heated to maintain solubility and prevent precipitation in the feed system, but the polymerization process itself can proceed at standard temperatures. This partial application of heat reduces overall energy consumption while maintaining the necessary solubility.
4Manufacturing precision
If precipitates form in the feed tanks, then uniform catalyst feeding is compromised, but maintaining precipitate-free solutions requires elevated temperatures
Solution Approach 1:
The patent changes the temperature parameter to ensure uniform catalyst feeding. By maintaining elevated temperatures in the feed system, the solution remains stable and precipitate-free, enabling precise and uniform catalyst delivery to the polymerization process. This parameter change directly addresses the contradiction between manufacturing precision and temperature requirements.
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 provides a stable catalyst solution that remains in solution for an extended period, reducing the risk of precipitation and maintaining consistent product quality, while allowing for higher aluminum concentrations, which minimizes solvent usage and maintains catalytic activity over a wide temperature range.
Implementation Method 1
Solutions comprising: (i) M, wherein M is represented by an alkaline earth metal or alkali metal and (ii) aluminum metal and (iii) a polyhydroxyl ether solvent
Data Source
AI summary
A stable catalyst solution suitable for catalyzing the polycondensation of reactants to make polyester polymers comprising: (i) M, wherein M is represented by an alkaline earth metal or alkali metal and (ii) aluminum metal and (iii) a polyhydroxyl ether solvent, wherein the molar ratio of M:AI ranges from 0.2:1 to 4:1 or less. The catalyst solution is desirably a solution which does not precipitate upon standing over a period of at least one week at room temperature (25°C-40°C), even at molar ratios of M:AI approaching 1:1. There is also provided a method for the manufacture of the solution, its feed to and use in the manufacture of a polyester polymer, and polyester polymers obtained by combining certain ingredients or containing the residues of these ingredients in the composition.