Recycled BHET Aqueous Solution for Stable Polyester Resin Feed
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Recycled bis(2-hydroxyethyl) terephthalate (BHET) obtained through depolymerization of waste polyester may deteriorate in quality during storage, affecting the final polyester resin's quality.
Innovation Solution
Preparing an aqueous solution of recycled BHET by mixing it with water at 60° C. to 110° C. and adjusting the concentration to 50% to 95% by weight, followed by esterification and polycondensation reactions to produce a polyester resin.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of moving object
If recycled BHET is stored for a period of time before polymerization, then storage flexibility is improved, but quality deterioration occurs
Solution Approach 1:
The patent changes the physical state parameter of recycled BHET from solid to aqueous solution form. This parameter change enables the material to maintain stability during storage while preserving its reactivity for polymerization. The aqueous solution form prevents quality deterioration during the storage period, thus resolving the contradiction between storage flexibility and quality stability.
Solution Approach 2:
Water acts as an intermediary substance that facilitates the storage of recycled BHET. By dissolving recycled BHET in water to form an aqueous solution, the patent creates a stable intermediate form that can be stored without quality deterioration. This intermediary approach allows the material to be stored and later used in polymerization without compromising quality.
2Device complexity
If recycled BHET is used directly in polymerization, then process simplicity is improved, but reaction efficiency decreases
Solution Approach 1:
The patent changes the physical state of recycled BHET from solid to aqueous solution, which improves its dispersibility and uniformity in the polymerization reaction. This parameter change enhances reaction efficiency by ensuring more consistent distribution of reactants, while the overall process remains relatively simple by using a straightforward dissolution step.
3Manufacturing precision
If recycled BHET is purified through crystallization, then purity is improved, but production time increases
Solution Approach 1:
The patent uses water as an intermediary to achieve purification. By dissolving recycled BHET in water and utilizing the aqueous solution form, the patent achieves effective purification without requiring time-consuming crystallization processes. The water-based approach allows for simpler and faster purification while maintaining high purity levels.
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 aqueous solution of recycled BHET maintains high purity and color stability during storage, enhancing the uniformity and reaction efficiency for producing high-quality polyester resin.
Implementation Method 1
preparing a polyester resin through an esterification reaction and a polycondensation reaction using the aqueous solution of recycled bis(2-hydroxyethyl) terephthalate
Implementation Method 2
preparing a polyester resin through an esterification reaction and a polycondensation reaction using the aqueous solution of recycled bis(2-hydroxyethyl) terephthalate
Implementation Method 3
mixing the recycled bis(2-hydroxyethyl) terephthalate with water at 60° C. to 110° C. to prepare an aqueous solution
Data Source
AI summary
A regenerated bis(2-hydroxyethyl)terephthalate obtained by the depolymerization of waste polyester is mixed with water to prepare an aqueous solution under specific temperature and concentration conditions, thereby ensuring storage stability. By introducing such a regenerated bis(2-hydroxyethyl)terephthalate aqueous solution into the polymerization of a polyester resin, the uniformity of raw materials and reaction efficiency can be increased, thereby improving the quality of the final polyester resin.