Shape Controlled Pro-Catalyst for Polymer Morphology
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Solution Overview
Problem
Conventional magnesium-titanium Ziegler-Natta catalysts produce polymers with irregular shapes and broad particle size distributions, leading to issues with flowability and bulk density, and existing methods for synthesizing spherical magnesium alkoxide particles are not scalable or stable.
Innovation Solution
A single-pot process involving the reaction of magnesium metal with alkanol and organic or inorganic modifiers without iodine, controlling the temperature to produce a shape-controlled pro-catalyst with spheroidal magnesium alkoxide particles that retain their morphology and size during catalyst synthesis and polymerization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional magnesium ethoxide precursors of 700-800 micron size are used, then the catalyst system is active, but the polymers produced have irregular shaped particles, low bulk density and broad particle size distribution
Solution Approach 1:
The patent applies preliminary action by pre-forming magnesium ethoxide particles with controlled size (45-55 mesh) and spherical morphology before catalyst synthesis. This pre-prepared magnesium ethoxide is then used in the catalyst system, ensuring that the catalyst particles inherit the regular shape and narrow size distribution, thereby producing polymers with improved particle morphology while maintaining catalytic activity
Solution Approach 2:
The patent changes the particle size parameter of magnesium ethoxide from conventional 700-800 microns to a controlled 45-55 mesh range. This parameter change in the precursor material directly influences the final catalyst and polymer particle morphology, achieving regular shaped particles with narrow size distribution while preserving catalyst activity
2Shape
If spherical magnesium alkoxide particles are synthesized by existing processes, then the particles are spherical, but they are frangible and do not retain morphology or particle size during pro-catalyst synthesis
Solution Approach 1:
The patent applies beforehand cushioning by carefully controlling the synthesis conditions of magnesium ethoxide to create particles with enhanced mechanical strength. The controlled reaction parameters and size reduction process produce particles that are cushioned against fragmentation during subsequent handling and pro-catalyst synthesis, enabling them to retain their spherical morphology and size distribution throughout the process
Solution Approach 2:
The patent changes the particle size parameter to a specific 45-55 mesh range and controls the synthesis conditions to produce denser, more robust spherical particles. This parameter optimization ensures the particles have sufficient mechanical integrity to withstand pro-catalyst synthesis without fragmenting, thereby retaining their morphology throughout the process
3Productivity
If pre-activation treatment is applied to increase catalytic activity, then the catalyst produces polymers with acceptable physical characteristics, but the polymers have unacceptable residues that need removal
Solution Approach 1:
The patent applies taking out by using a well-defined, controlled catalyst system based on pre-formed magnesium ethoxide particles with specific size distribution. This controlled approach allows for better management of catalytic activity while minimizing the formation of harmful residues, eliminating the need for special residue removal treatments that are required with conventional pre-activated catalysts
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 process yields a stable, infrangible shape-controlled pro-catalyst with a narrow particle size distribution, improving polymer flowability and bulk density, and enabling the production of ultrahigh density polyethylene with consistent morphology.
Implementation Method 1
reacting at least one alkanol with magnesium metal using at least one organic modifier, inorganic modifier or a combination thereof and optionally, at least one solvent. During the reaction hydrogen gas is evolved.
Implementation Method 2
The rate of evolution of hydrogen gas is increased in a controlled manner by increasing the temperature in a graded manner to 100° C.
Implementation Method 3
obtain a mass containing the pro-catalyst which is then dried to provide a free flowing pro-catalyst. The pro-catalyst has a controlled shape and the particle size ranges between 10 to 50μ.
Data Source
AI summary
The present disclosure relates to a single-pot process for the preparation of a shape controlled pro-catalyst. The process comprises the steps of i. reacting at least one alkanol with magnesium metal using at least one modifier and optionally, at least one solvent resulting in evolution of hydrogen gas, increasing the evolution of the hydrogen gas in a controlled manner by increasing the temperature in a graded manner to 100° C. to obtain a mass, and ii. subjecting the mass to drying to obtain a free flowing procatalyst.