Boria-Containing Polymerization Catalyst Preparation
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Solution Overview
Problem
Current methods for producing polymerization catalysts are inefficient and costly, necessitating the development of new preparation methods to enhance catalyst production economics and polymerization activity.
Innovation Solution
A method involving the contact of a support, such as alumina, with chromium-containing compounds and boria precursors to form a catalyst precursor, which is then activated to produce a boria-containing polymerization catalyst (BCPC) with increased polymerization activity and reduced low molecular weight components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional methods are used to produce polymerization catalysts, then the production process is simpler, but the production cost is high and polymerization activity is low
Solution Approach 1:
The patent applies preliminary action by incorporating boria precursors into the catalyst support during the catalyst preparation stage, before the actual polymerization process. This pre-incorporation of boria modifies the catalyst structure in advance, enabling enhanced polymerization activity without adding complexity to the polymerization process itself. The boria is integrated into the alumina support structure during catalyst synthesis, creating a pre-optimized catalyst that delivers superior performance.
Solution Approach 2:
The patent employs composite materials by creating a tri-component catalyst system consisting of chromium species supported on alumina with incorporated boria. This composite structure combines the catalytic activity of chromium, the structural stability of alumina, and the promotional effects of boria, resulting in a catalyst with enhanced polymerization activity and selectivity that overcomes the limitations of conventional binary catalyst systems.
2Object-affected harmful factors
If conventional catalysts are used, then the processing is simpler, but low molecular weight components increase causing smoke generation
Solution Approach 1:
The patent applies parameter changes by modifying the catalyst's chemical composition through boria incorporation, which fundamentally alters the catalytic active sites' properties. This compositional parameter change affects the polymerization mechanism, leading to improved control over molecular weight distribution and reduced formation of low molecular weight components, thereby eliminating smoke generation during processing.
Solution Approach 2:
The patent implements local quality by creating specific modified regions within the catalyst structure where boria is incorporated into the alumina support. These localized boria-alumina interactions create specific active site environments that favor the formation of high molecular weight polymers while suppressing chain transfer reactions that produce low molecular weight components, thus controlling molecular weight distribution at the active site level.
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 BCPC exhibits enhanced polymerization activity, increased average molecular weight, and reduced low molecular weight components, improving polymer production efficiency and reducing drawbacks like smoke generation during processing.
Implementation Method 1
contacting a support with one or more chromium-containing compounds and one or more boria precursors to provide a catalyst precursor
Implementation Method 2
activating the catalyst precursor to provide a polymerization catalyst
Data Source
AI summary
A method comprising contacting a support with one or more chromium-containing compounds and one or more boria precursors to provide a catalyst precursor, and activating the catalyst precursor to provide a polymerization catalyst.