Ethylene Glycol Composition for Stable UV-Grade Polyester
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Solution Overview
Problem
Existing ethylene glycol production methods, particularly the coal-based synthesis gas method, result in unstable product quality due to varying reaction mechanisms and impurity components, affecting the UV transmittance and overall quality of polyester-grade ethylene glycol, which impacts the gloss, chroma, and coloring of downstream polyester fibers.
Innovation Solution
A specific ethylene glycol composition with controlled amounts of propylene glycol, butanediol, and hexanediol, along with an improved distillation process, including a specific alcohol recovery tower, to enhance the quality of ethylene glycol for polyester production, resulting in a polyester with low glass transition temperature and excellent toughness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If multiple distillation towers are used to purify crude ethylene glycol to remove organic impurities, then the UV transmittance and quality of ethylene glycol are improved, but the device complexity and production cost increase
Solution Approach 1:
The patent extracts and removes specific harmful impurities (conjugated aldehydes, carboxylic acids, and other organic impurities) from ethylene glycol through targeted purification steps including extraction, adsorption, and selective distillation, rather than using multiple complex distillation towers for complete purification
Solution Approach 2:
The patent controls and adjusts key parameters such as distillation temperature, pressure, and pH levels during the purification process to optimize impurity removal while maintaining ethylene glycol quality and reducing the need for complex multi-tower systems
2Ease of manufacture
If the coal-based synthesis gas method is used to produce ethylene glycol, then the production cost and energy consumption are reduced, but the product quality stability deteriorates due to varying impurity components
Solution Approach 1:
The patent implements quality control feedback mechanisms that monitor impurity levels in real-time during coal-based synthesis gas processing, allowing dynamic adjustment of purification parameters to maintain consistent ethylene glycol quality despite variations in raw material composition
Solution Approach 2:
The patent uses composite purification systems combining multiple purification techniques (extraction, adsorption, distillation) working together to handle the complex impurity profile from coal-based synthesis, achieving both cost-effectiveness and quality stability
3Manufacturing precision
If impurities such as conjugated aldehydes and carboxylic acids are completely removed from ethylene glycol, then the polyester quality is improved, but the loss of substance increases
Solution Approach 1:
The patent converts the purification process into a beneficial operation by selectively removing only harmful impurities (conjugated aldehydes, carboxylic acids) that affect polyester quality, while preserving and recovering the majority of ethylene glycol through efficient separation and recycling systems
Solution Approach 2:
The patent discards only the harmful impurity fractions during purification while recovering and recycling the bulk ethylene glycol stream, minimizing substance loss through integrated recovery systems that capture and return purified ethylene glycol to the production process
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 ethylene glycol composition, when polymerized with terephthalic acid, produces a polyester with improved strength, heat resistance, and low-temperature dyeability, broadening its application scope and enhancing the quality of polyester fibers.
Implementation Method 1
many ethylene glycol manufacturers need to use several distillation towers to purify and refine crude ethylene glycol
Implementation Method 2
CN105585446A discloses an ethylene glycol composition, in particular an ethylene glycol composition obtained by hydrogenation of oxalate
Data Source
AI summary
An ethylene glycol composition, a preparation method thereof, and a polyester prepared from the ethylene glycol composition are provided. The ethylene glycol composition of the present invention has a specific content of propylene glycol, butanediol and hexanediol. The polyester obtained by polymerizing the ethylene glycol composition with a dibasic acid such as terephthalic acid has a low glass transition temperature and excellent toughness while maintaining excellent strength and heat resistance, which can greatly broaden the application scope of the polyester, and is particularly useful for low-temperature dyeing fibers.