Propylene Polymerization Catalyst Using Non-Aromatic Electron Donors
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Solution Overview
Problem
Current solid catalysts for propylene polymerization, particularly those using aromatic electron donors, fail to achieve high stereoregularity and molecular weight distribution while posing environmental and health risks due to endocrine-disrupting properties, and existing methods have limitations in activity and yield.
Innovation Solution
A solid catalyst comprising titanium, magnesium, halogen, and a mixture of non-aromatic compounds such as bicycloalkane dicarboxylates, diether compounds, and succinate compounds is developed, which improves stereoregularity and molecular weight distribution, and is prepared through a specific method involving reaction steps with titanium halides and electron donors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If aromatic dialkyldiesters or aromatic monoalkylmonoesters are used as internal electron donors to improve catalyst activity and stereoregularity, then polymerization activity and stereoregularity are improved, but harmful effects on human health and ecosystem occur due to endocrine disruption
Solution Approach 1:
The patent changes the chemical structure parameter of the internal electron donor from aromatic compounds to non-aromatic compounds (specifically bicycloalkane dicarboxylates, bicycloalkene dicarboxylates, diether compounds, or succinate compounds). This structural parameter change eliminates the endocrine-disrupting properties while maintaining the electron-donating function necessary for catalyst activity and stereoregularity control.
Solution Approach 2:
The patent replaces harmful aromatic compounds with safer, biodegradable non-aromatic compounds. These alternative compounds achieve the same catalytic function but without persistent environmental contamination or health hazards, effectively using shorter-lived, safer substances to replace harmful ones.
2Ease of manufacture
If EP 0362705B1 method using 1,3-diether compounds is used to prepare catalyst, then catalyst preparation is simplified, but activity and stereoregularity are insufficient and molecular weight distribution is narrow
Solution Approach 1:
The patent uses composite internal electron donor systems comprising combinations of bicycloalkane dicarboxylates, bicycloalkene dicarboxylates, diether compounds, or succinate compounds. These composite donor systems provide synergistic effects that enhance stereoregularity and broaden molecular weight distribution while maintaining ease of catalyst preparation.
Solution Approach 2:
The patent introduces multiple types of electron donor compounds with different local chemical properties (bicycloalkane, bicycloalkene, diether, succinate structures) to create heterogeneous electron donation environments at the catalyst active sites. This local diversity in electron donor quality enables simultaneous improvement of stereoregularity and molecular weight distribution.
3Manufacturing precision
If Korean Patent No. 0572616 method using non-aromatic compound containing ketone and ether groups is used, then some improvement in stereoregularity is achieved, but molecular weight distribution still needs significant improvement
Solution Approach 1:
The patent changes the chemical structure parameters of the internal electron donors to include bicycloalkane dicarboxylates, bicycloalkene dicarboxylates, diether compounds, or succinate compounds with specific structural features (cyclic structures, ether groups, carboxylate groups) that enable both high stereoregularity and broad molecular weight distribution through optimized electron donation characteristics.
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 new catalyst achieves high stereoregularity and catalyst activity with a wide molecular weight distribution, enhancing the production yield of polypropylene while being eco-friendly and safe for human health.
Implementation Method 1
a solid catalyst for propylene polymerization, which comprises titanium, magnesium, halogen and an internal electron donor mixture of non-aromatic compounds
Implementation Method 2
a method for preparing polypropylene using the same
Data Source
AI summary
Provided are a solid catalyst for propylene polymerization which includes titanium, magnesium, halogen and an internal electron donor mixture of two or more compounds wherein the internal electron donor mixture includes at least one selected from the bicycloalkanes or bicycloalkenes and at least one selected from diethers and succinates, and a method for preparing propylene using the same. As disclosed, it is possible to prepare polypropylene having an excellent stereoregularity with a high production yield.