Magnesium Alkoxide Catalyst Carrier for Olefin Polymerization
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Solution Overview
Problem
Current olefin polymerization catalysts using magnesium halides as carriers have limitations in achieving optimal activity and morphology due to variations in microscopic structure and active center distribution, which affect the performance of polypropylene catalysts.
Innovation Solution
A catalyst carrier with a specific chemical composition, Mg(ORI)n(ORII)2-n, is developed, characterized by a set of diffraction peaks in the X-ray diffraction pattern, and prepared through a method involving the reaction of alcohol with metal magnesium powder in the presence of a halogen or halogen-containing compound, followed by high temperature and pressure treatment, to enhance the activity and morphology of olefin polymerization catalysts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If magnesium halide carriers are used in olefin polymerization catalysts, then the catalysts can achieve basic polymerization function, but the activity and morphology are limited due to variations in microscopic structure and active center distribution
Solution Approach 1:
The patent changes the chemical composition parameters of the magnesium carrier by introducing specific ratios of MgCl2 and Mg(OH)2 (where Mg(OH)2 content is 5-50 wt%), and controls the specific surface area (5-50 m²/g) and pore volume (0.05-0.5 mL/g) to optimize catalyst activity while achieving uniform microscopic structure
Solution Approach 2:
The patent creates a composite magnesium carrier system combining MgCl2 and Mg(OH)2 in specific proportions, where the composite structure provides both high activity from MgCl2 and morphological control from Mg(OH)2, resolving the contradiction between catalyst activity and structure uniformity
2Productivity
If different magnesium sources are used to prepare carriers, then the catalyst performance can be optimized, but the preparation process complexity increases
Solution Approach 1:
The patent performs preliminary preparation of the magnesium carrier with controlled composition and structure before catalyst impregnation, pre-establishing the optimal MgCl2-Mg(OH)2 ratio and surface properties so that the subsequent catalyst preparation follows a simple, standardized procedure
Solution Approach 2:
The patent simplifies the preparation process by focusing on controlling key parameters (Mg(OH)2 content 5-50 wt%, specific surface area 5-50 m²/g) rather than complex multi-step procedures, achieving high catalyst activity through parameter optimization rather than process complexity
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 use of the Mg(ORI)n(ORII)2-n carrier results in a catalyst with higher activity and improved polymer particle size distribution and morphology, specifically suitable for olefin polymerization, leading to better polymer properties.
Implementation Method 1
reacting the carrier with a titanium compound
Implementation Method 2
the carrier can make TiCl4 dispersed to increase the number of active centers
Implementation Method 3
the carrier can make the active center relatively fixed in position by bonding with the active center
Data Source
AI summary
A method of making an olefin polymerization catalyst carrier with a general structure formula of Mg(ORI)n(ORII)2-n, wherein: 0≤n≤2, and RI and RII can be the same or different and are each independently selected from a C1-C20 hydrocarbon group by reacting an alcohol with a metal magnesium powder under the protection of nitrogen in the presence of a halogen or a halogen-containing compound to obtain a first product, and subjecting the product to a treatment pressure of from 0.2 to 5.0 MPa at a treatment temperature of from 80 to 200° C. for a duration of between 2 minutes and 6 hours. Also provided is a method of making an olefin polymerization solid catalyst component which includes the catalyst carrier, a titanium compound, and at least one electron donor compound.