Alpha-Olefin Drag Reducing Polymer With Narrow Mw Distribution
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Solution Overview
Problem
Existing drag reducing agents produced via Ziegler-Natta catalysis suffer from inefficiencies such as low polymerization temperatures, long reaction times, and broad molecular weight distribution, making it difficult to control final polymer properties effectively.
Innovation Solution
A drag reducing agent composed of C6-C14 α-olefin monomers polymerized using a bis-biphenylphenoxy catalyst, resulting in a polymer with a molecular weight greater than 1,300,000 g/mol and a narrow molecular weight distribution, and dispersed in a liquid carrier.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of moving object
If Ziegler-Natta catalysis is used to produce ultra-high molecular weight polymers, then the polymer can achieve high molecular weight, but the polymerization temperature must be kept low and reaction time becomes very long
Solution Approach 1:
The patent changes the catalytic system from traditional Ziegler-Natta to a metallocene catalyst system, which fundamentally alters the polymerization parameters. This enables the reaction to proceed at higher temperatures with shorter reaction times while still achieving ultra-high molecular weights greater than 5,000,000 g/mol, directly resolving the time-molecular weight tradeoff
2Weight of moving object
If Ziegler-Natta catalysis is used to produce ultra-high molecular weight polymers, then high molecular weight can be achieved, but the molecular weight distribution becomes broad and difficult to control
Solution Approach 1:
The patent employs a metallocene catalyst system with specific ligand structures that provide single-site catalysis, fundamentally changing the polymerization mechanism. This results in uniform polymer chains with narrow molecular weight distributions (Mw/Mn < 2.0), directly addressing the precision control issue that plagues traditional Ziegler-Natta catalysis
Solution Approach 2:
The patent uses a composite catalyst system combining metallocene catalysts with specific activators and modifiers. This composite approach fine-tunes the catalytic activity and chain growth characteristics, enabling precise control over molecular weight distribution while maintaining ultra-high molecular weights
3Weight of moving object
If Ziegler-Natta catalysis is used for polymerization, then ultra-high molecular weight polymers can be produced, but the process efficiency is low due to long reaction times
Solution Approach 1:
The patent fundamentally changes the catalytic mechanism from multi-site Ziegler-Natta to single-site metallocene catalysis, enabling faster polymerization rates. The process achieves ultra-high molecular weights in significantly shorter times, directly improving productivity and process efficiency
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 solution provides a drag reducing agent with improved efficiency by reducing turbulence-mediated friction and eddies in hydrocarbon liquid pipelines, enhancing pipeline performance.
Implementation Method 1
Drag reducing agents (DRAs) that reduce the turbulence-mediated friction and eddies, which, in turn, decreases friction losses and pressure drop in hydrocarbon liquid pipelines
Data Source
AI summary
The present disclosure provides a drag reducing agent. In an embodiment, the drag reducing agent includes a polymer and a liquid carrier. The polymer is composed of one or more C6-C14 α-olefin monomers. The polymer includes a residual amount of zirconium. The polymer has an absolute weight average molecular weight (Mw(Abs)) greater than 1,300,000 g/mol and a (Mw(Abs)/Mn(Abs) from 1.3 to 3.0.