1,8-Naphthyl Diaryloate Internal Donor for Olefin Polymerization Catalysts
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Solution Overview
Problem
Existing Ziegler-Natta polymerization catalysts using organic magnesium compounds result in catalyst particles with uncontrolled morphology and high production costs, while replacing these with magnesium halides leads to difficult-to-control aspherical particles and requires expensive processes.
Innovation Solution
The use of 1,8-naphthyl diaryloate internal electron donor compounds in solid titanium catalyst components, which include a titanium compound, a magnesium compound, and an organoaluminum compound, improves catalyst activity and control over polymer composition, allowing for the production of polyolefins with desired properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If organic magnesium compound is used as starting material, then catalyst activity is improved, but production cost increases and particle morphology control becomes difficult
Solution Approach 1:
The patent introduces specific parameters for the internal electron donor compound (1,8-naphthyl diaryloate) with defined molecular structure and composition ratios. By optimizing the donor compound structure and its interaction with titanium and magnesium compounds, the patent achieves high catalyst activity while using cost-effective magnesium halide instead of expensive organic magnesium compounds.
2Ease of manufacture
If magnesium halide is used instead of organic magnesium compound, then production cost is reduced, but particle morphology control becomes difficult and particles become aspherical
Solution Approach 1:
The internal electron donor compound (1,8-naphthyl diaryloate) acts as an intermediary between magnesium halide and titanium compound. This intermediary substance facilitates the formation of spherical catalyst particles with controlled morphology, enabling the use of inexpensive magnesium halide while maintaining desirable particle shape and size distribution.
3Manufacturing precision
If spray congealing process is used to control particle morphology, then particle shape control is improved, but capital equipment cost and process complexity increase
Solution Approach 1:
The patent extracts the particle morphology control function from the complex spray congealing process and embeds it directly into the catalyst formulation through the internal electron donor compound. This eliminates the need for specialized spray congealing equipment and complex process controls, achieving spherical particle formation through simple mixing and precipitation.
4Productivity
If conventional Ziegler-Natta catalyst is used, then polymerization proceeds, but hydrogen response and polymer composition control are insufficient
Solution Approach 1:
The patent creates a composite catalyst system combining titanium compound, magnesium compound, and 1,8-naphthyl diaryloate internal electron donor compound. This composite structure provides multiple functional sites that simultaneously enable high polymerization activity and precise control over polymer composition through enhanced hydrogen response.
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 1,8-naphthyl diaryloate compounds enhance catalyst activity and hydrogen response, enabling the production of polyolefins with controlled xylene solubles and melt flow indexes, resulting in improved polymerization control and efficiency.
Implementation Method 1
1,8-naphthyl diaryloate internal electron donor compounds... provide at least one of improved catalyst activity, improved hydrogen response
Implementation Method 2
Known methods of making polyolefins involve the use of Ziegler-Natta polymerization catalysts. These catalysts polymerize vinyl monomers
Data Source
AI summary
Disclosed are 1,8-naphthyl diaryloates, methods of making 1,8-naphthyl diaryloates, methods of using 1,8-naphthyl diaryloates, solid titanium catalyst components, catalyst systems containing solid titanium catalyst components, methods of making solid titanium catalyst components, and polymerization methods. The solid titanium catalyst components contain a 1,8-naphthyl diaryloate internal electron donor compound. The catalyst system can contain a solid titanium catalyst component, an organoaluminum compound, and an organosilicon compound.