Solid Catalyst Component for Olefin Polymerization with Dual Electron-Donating Compounds
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing solid catalyst components for olefin polymerization, particularly those containing titanium, magnesium, halogen, and internal electron-donating compounds, face issues with poor stereoregularity of propylene homopolymers and low reactivity during ethylene-propylene copolymerization, leading to inefficient production processes due to high diether compound content ratios.
Innovation Solution
A solid catalyst component comprising titanium, magnesium, halogen, and an internal electron-donating compound with a phthalic acid ester structure, combined with an electron-donating compound having two or more groups from ether, ester, and carbonate groups, but no phthalic acid ester structure, with a specific content ratio of 0.5 to 1.5% by mass, to enhance ethylene responsiveness and stereoregularity during ethylene-propylene copolymerization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the content ratio of diether compound is high in the solid catalyst component, then the catalyst can be produced with certain stability, but the stereoregularity of propylene homopolymer deteriorates and ethylene reactivity decreases
Solution Approach 1:
The patent applies parameter changes by precisely controlling the content ratio of electron-donating compounds. Specifically, it sets the ratio of diether compound to phthalic acid ester compound within 0.05 to 5.0, and further optimizes it to 0.1 to 3.0, thereby achieving both catalyst stability and high stereoregularity in propylene homopolymer production.
Solution Approach 2:
The patent uses composite materials by combining multiple electron-donating compounds (phthalic acid ester compound and diether compound) in specific proportions within the solid catalyst component. This composite approach allows the catalyst to achieve both stability and high stereoregularity simultaneously, resolving the contradiction between reliability and manufacturing precision.
2Reliability
If the content ratio of diether compound is high in the solid catalyst component, then the catalyst can be produced with certain stability, but the reactivity during ethylene-propylene copolymerization deteriorates
Solution Approach 1:
The patent applies parameter changes by precisely controlling the content ratio of electron-donating compounds. Specifically, it sets the ratio of diether compound to phthalic acid ester compound within 0.05 to 5.0, and further optimizes it to 0.1 to 3.0, thereby achieving both catalyst stability and high stereoregularity in propylene homopolymer production.
Solution Approach 2:
The patent uses composite materials by combining multiple electron-donating compounds (phthalic acid ester compound and diether compound) in specific proportions within the solid catalyst component. This composite approach allows the catalyst to achieve both stability and high stereoregularity simultaneously, resolving the contradiction between reliability and manufacturing precision.
3Productivity
If a large amount of ethylene is fed for copolymerization to compensate for low reactivity, then the copolymerization can proceed, but the separation of unreacted monomers from propylene becomes difficult
Solution Approach 1:
The patent applies parameter changes by precisely controlling the content ratio of electron-donating compounds. Specifically, it sets the ratio of diether compound to phthalic acid ester compound within 0.05 to 5.0, and further optimizes it to 0.1 to 3.0, thereby achieving both catalyst stability and high stereoregularity in propylene homopolymer production.
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 proposed catalyst component achieves favorable ethylene responsiveness and high stereoregularity in propylene homopolymers, improving production efficiency by optimizing the content ratio of electron-donating compounds, resulting in better ethylene response and copolymerization activity.
Implementation Method 1
solid catalyst component for olefin polymerization, comprising titanium, magnesium, halogen, and an internal electron-donating compound
Data Source
AI summary
Provided is a solid catalyst component for olefin polymerization which is capable of exerting favorable ethylene responsiveness while forming a propylene homopolymer having high stereoregularity, when subjected to ethylene-propylene copolymerization reaction. The present invention provides a solid catalyst component for olefin polymerization, comprising titanium, magnesium, halogen, and an internal electron-donating compound, wherein the internal electron-donating compound comprises an electron-donating compound (i) having a phthalic acid ester structure, and an electron-donating compound (ii) having two or more kinds of groups selected from an ether group, an ester group and a carbonate group and having no phthalic acid ester structure, wherein a content ratio of the electron-donating compound (ii) having two or more kinds of groups selected from an ether group, an ester group and a carbonate group and having no phthalic acid ester structure is 0.5 to 1.5% by mass.