Propylene Polymerizing Catalyst Reducing VOC Content
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Solution Overview
Problem
Current polypropylene production methods face challenges in achieving high hydrogen reactivity and reducing volatile organic compound (VOC) content, which affects melt-flowability and eco-friendliness, particularly due to limitations in catalyst activity and stereoregularity.
Innovation Solution
A propylene polymerizing solid catalyst is developed using a carrier produced by reacting dialkoxymagnesium with a metal halide and titanium halide, combined with a first internal electron donor of cyclic diester structure and a second internal electron donor of diether structure, optimizing the reaction conditions to enhance hydrogen reactivity and reduce VOC content.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the injection amount of hydrogen is increased to improve melt-flowability, then molecular weight of polypropylene is reduced and melt-flowability is improved, but catalyst activity is insufficient to maintain high productivity
Solution Approach 1:
The patent changes the chemical parameters of the catalyst system by introducing a specific diether compound (2,2-diisopropyl-1,3-propanediol) as internal electron donor and using dialkoxymagnesium carrier, which alters the catalyst's electronic structure and activity, enabling high productivity even at low hydrogen injection amounts
Solution Approach 2:
The patent creates a composite catalyst system combining titanium halide, dialkoxymagnesium carrier, diether internal electron donor, and silane external electron donor, where the synergistic interaction between components achieves both high activity and controlled molecular weight
2Productivity
If conventional catalysts are used to maintain high catalyst activity, then productivity is maintained, but VOC content in the polypropylene remains high causing harmful effects
Solution Approach 1:
The patent changes the chemical composition parameters by using a diether compound with specific molecular structure (2,2-diisopropyl-1,3-propanediol) as internal electron donor, which modifies the catalyst's interaction with monomers and reduces oligomer formation, thereby lowering VOC content while maintaining activity
Solution Approach 2:
The patent converts the potential harm of VOC generation into a benefit by optimizing the electron donor system to suppress oligomer formation pathways, transforming the catalyst system into one that inherently produces less harmful byproducts while maintaining high productivity
3Device complexity
If a single type of internal electron donor is used to simplify the catalyst system, then device complexity is reduced, but hydrogen reactivity and stereoregularity cannot be simultaneously optimized
Solution Approach 1:
The patent merges two types of electron donors (diether internal electron donor and silane external electron donor) into a unified catalyst system, where they work synergistically to simultaneously enhance hydrogen reactivity and stereoregularity, achieving performance that neither component could provide alone
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 catalyst improves hydrogen reactivity, adjusts molecular weight distribution, and significantly reduces VOC content, resulting in eco-friendly polypropylene with enhanced melt-flowability.
Implementation Method 1
a carrier produced by making dialkoxymagnesium react with a metal halide
Implementation Method 2
a propylene polymerizing solid catalyst capable of producing an eco-friendly polypropylene which improves hydrogen reactivity of a catalyst and lowers the content of a total volatile organic compound (T-VOC) using the catalyst
Data Source
AI summary
The present invention relates to a propylene polymerizing solid catalyst for reducing the volatile organic compound (VOC) and a method of producing polypropylene using the propylene polymerizing solid catalyst, the propylene polymerizing solid catalyst including an organic electron donor formed of a combination of a first internal electron donor of titanium, magnesium, halogen and cyclic diester and a second internal electron donor of diether, and has improved hydrogen reactivity of a catalyst compared to a conventional method and has an effect that is capable of producing an eco-friendly polypropylene which has greatly lowered a content of the VOC by using the catalyst.