Lubricant Composition for High-Pressure Polymerization
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Solution Overview
Problem
Existing lubricant compositions fail to effectively prevent self-polymerization of polar comonomers in high-pressure free radical polymerizations, leading to premature device failure in rotational and reciprocating equipment.
Innovation Solution
A composition comprising an oil and a non-aromatic polar compound with a dipole moment greater than or equal to 1.00 Debye, present in amounts from 5 to 100 ppm, is used to inhibit self-polymerization, comprising less than 1.0 weight percent of the composition, which is injected into reactor systems and equipment to reduce polymer build-up and extend device lifespan.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional lubricant compositions are used in high-pressure free radical polymerization, then basic lubrication function is provided, but self-polymerization of polar comonomers occurs and devices fail prematurely
Solution Approach 1:
The patent introduces a specific polar compound (with dipole moment ≥1.00 Debye) as an intermediary substance that selectively interacts with the polar comonomer. This intermediary compound preferentially solvates or complexes with the polar comonomer, preventing it from undergoing self-polymerization while allowing the lubricant base oil to maintain its lubrication function. This resolves the contradiction by adding a mediating substance that specifically addresses the harmful self-polymerization without compromising device reliability.
Solution Approach 2:
The patent changes the chemical composition parameters of the lubricant by incorporating polar compounds with specific dipole moments (≥1.00 Debye) at controlled concentrations (5-1000 ppm). This parameter change modifies the lubricant's interaction with polar comonomers, enabling it to suppress self-polymerization through dipole-dipole interactions or hydrogen bonding, thereby extending device operational life without sacrificing lubrication performance.
2Stability of the object's composition
If polymerization inhibitors are used to counter self-polymerization, then comonomer stability is improved, but device reliability still deteriorates due to premature failure
Solution Approach 1:
Instead of using conventional polymerization inhibitors that may have adverse effects on device components, the patent employs a polar compound as an intermediary that specifically targets polar comonomers through dipole interactions. This intermediary approach stabilizes the comonomer composition by preventing self-polymerization while being compatible with device materials, thus simultaneously improving both comonomer stability and device reliability.
Solution Approach 2:
The patent modifies the lubricant composition by introducing polar compounds with specific dipole moment parameters (≥1.00 Debye) at optimized concentrations (5-1000 ppm). This parameter change enables the lubricant to act as a stabilizing agent for polar comonomers through molecular interactions, preventing premature device failure while maintaining comonomer stability throughout extended operational periods.
3Reliability
If lubricant composition is optimized to prevent self-polymerization, then device reliability is improved, but polymer build-up in equipment increases
Solution Approach 1:
The patent uses a polar compound as an intermediary that preferentially binds to polar comonomers, forming stable complexes that prevent both self-polymerization and adhesion to device surfaces. This intermediary mechanism reduces polymer build-up in equipment while maintaining device reliability by keeping the comonomer in a stable, non-polymerizing state throughout the system.
Solution Approach 2:
The polar compound in the lubricant effectively extracts or sequesters the polar comonomer from the reaction environment through dipole-dipole interactions or hydrogen bonding. This extraction prevents the comonomer from participating in unwanted polymerization reactions that would lead to build-up, while the lubricant composition continues to protect device reliability.
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 composition significantly reduces self-polymerization and polymer build-up in equipment, thereby preventing premature failure and extending the operational life of devices used in high-pressure polymerization processes.
Implementation Method 1
wherein the non-aromatic compound has Dipole Moment greater than, or equal to, 1.00 Debye
Data Source
Figure 1
AI summary
The invention provides a composition comprising at least the following: an oil, and at least one compound selected from Compounds 1 through 3, or a combination thereof, as described herein. The composition can be used to improve the high pressure, free-radical polymerizations of ethylene-based interpolymers, and to reduce polymer build-up in reciprocation devices throughout the process.