Diphenol-Based Catalyst for Olefin Polymerization
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Solution Overview
Problem
The use of phthalates as internal donors in Ziegler-Natta catalysts for propylene polymerization raises health concerns and results in unsatisfactory activity and stereospecificity when aromatic structures are involved, necessitating the development of alternative electron donors.
Innovation Solution
A solid catalyst component comprising Mg, Ti, and a specific diphenol derivative as an electron donor, where the diphenol is modified with functional groups capable of reacting with its hydroxy group, enhancing activity and stereospecificity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If phthalates are used as internal donors in Ziegler-Natta catalysts, then good activity and stereospecificity are achieved, but health concerns arise due to medical issues associated with their use
Solution Approach 1:
The patent removes the harmful phthalate component from the catalyst system while preserving the desired stereospecificity function through alternative electron donors (esters of benzoic acid, naphthoic acid, or their mixtures with diisobutylphthalate), thereby extracting the harmful element while maintaining the beneficial effect
Solution Approach 2:
The patent changes the chemical parameters of the internal donor by substituting phthalate esters with esters of benzoic acid and/or naphthoic acid, altering the molecular structure to eliminate health concerns while maintaining or improving catalytic performance
2Reliability
If aromatic structures are involved in internal donors, then good stereospecificity is achieved, but unsatisfactory activity is observed
Solution Approach 1:
The patent applies local quality by using non-aromatic aliphatic ester structures (from fatty acids like pentanoic, hexanoic, heptanoic acid) instead of aromatic structures, creating localized chemical environments that provide both high activity and acceptable stereosspecificity through controlled electron donation
Solution Approach 2:
The patent employs composite catalyst systems combining multiple electron donors (esters of benzoic acid, naphthoic acid, and/or diisobutylphthalate in specific ratios) to achieve synergistic effects that simultaneously improve activity and stereosspecificity, overcoming the limitations of single-component donors
3Reliability
If diisobutylphthalate is used as internal donor, then good stereospecificity is achieved, but health problems arise due to classification as source of heavy health problems
Solution Approach 1:
The patent extracts the harmful diisobutylphthalate component from the catalyst formulation and replaces it with safer alternative electron donors (esters of benzoic acid and/or naphthoic acid), removing the source of health problems while maintaining catalytic stereosspecificity
Solution Approach 2:
The patent adopts alternative electron donor compounds that are safer and more environmentally friendly, replacing the persistent harmful phthalate with compounds that can be more easily managed and disposed of, reducing long-term health risks
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 catalysts exhibit improved balance of activity and stereospecificity, overcoming the limitations of aromatic diolesters and addressing health concerns associated with phthalates.
Implementation Method 1
a solid catalyst component for the polymerization of olefins comprising Mg, Ti, Cl and at least an electron donor compound which is the reaction product obtained by bringing into contact a Mg compound and a Ti compound having at least a Ti-halogen bond with a diphenol derivative
Implementation Method 2
catalyst components for the polymerization of olefins, in particular propylene... The catalysts exhibit improved balance of activity and stereospecificity
Data Source
AI summary
A solid catalyst component for the polymerization of olefins comprising Mg, Ti, Cl and at least an electron donor compound which is the reaction product obtained by bringing into contact a Mg compound and a Ti compound having at least a Ti-halogen bond with an electron donor selected from specific diphenol derivatives.