Continuous High-Pressure Ethylene Copolymerization Process
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Solution Overview
Problem
Existing polymerization processes for ethylene copolymers used in lubricants are not continuous, stable, scalable, solvent-free, and fail to achieve high acrylate content, leading to issues with pour point, miscibility, oxidation stability, and viscosity index.
Innovation Solution
A continuous high-pressure polymerization process that combines ethylene with polar and unpolar acrylates in the presence of a chain transfer agent, using high-pressure autoclaves or tube reactors, to produce a liquid ethylene copolymer with specific weight percentages of ethylene, polar, and unpolar acrylates, achieving high acrylate content and improved lubricant properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If existing polymerization processes are used for ethylene copolymers, then production can be maintained, but the process is not continuous, stable, scalable, and fails to achieve high acrylate content
Solution Approach 1:
The patent implements a continuous high-pressure polymerization process where monomer feed is continuously supplied to the reactor system, enabling uninterrupted production of ethylene copolymer. This eliminates batch-to-batch variations and maintains consistent process conditions, achieving both continuous operation and process stability simultaneously
Solution Approach 2:
The patent optimizes specific parameter ranges including pressure (1000-4000 bar), temperature (150-300°C), and chain transfer agent concentration (at least 2 wt%) to enable continuous operation while maintaining process stability and achieving high acrylate content (at least 35 wt%) in the copolymer product
2Quantity of substance
If high acrylate content is achieved in the ethylene copolymer, then lubricant properties improve, but the process complexity increases
Solution Approach 1:
The patent achieves high acrylate content (at least 35 wt%) by optimizing polymerization parameters including pressure (1000-4000 bar), temperature (150-300°C), and monomer feed composition, rather than through complex process equipment. This allows high acrylate incorporation through controlled chemical reactions under defined conditions
Solution Approach 2:
The patent uses chain transfer agents (at least 2 wt%) as intermediaries to control the polymerization reaction, enabling high acrylate content incorporation while maintaining process simplicity. The chain transfer agent mediates the reaction between ethylene and acrylate monomers, facilitating the desired copolymer composition without requiring complex process equipment
3Temperature
If the ethylene copolymer has high acrylate content, then pour point decreases and miscibility improves, but manufacturing control becomes more difficult
Solution Approach 1:
The patent achieves low pour point and improved miscibility by precisely controlling the acrylate content (at least 35 wt%) through optimized polymerization parameters including pressure (1000-4000 bar), temperature (150-300°C), and monomer feed composition. This systematic parameter control ensures reproducible compositional outcomes
Solution Approach 2:
The patent implements process monitoring and control to maintain consistent copolymer composition. By continuously monitoring polymerization conditions and adjusting parameters as needed, the process achieves both low pour point (through high acrylate content) and precise compositional control, resolving the apparent contradiction between these two requirements
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 results in a liquid ethylene copolymer with low pour point, good miscibility, high viscosity index, and enhanced chemical stability, suitable for use in lubricants, providing improved lubrication performance and stability.
Implementation Method 1
a monomer feed comprising the ethylene and the acrylate is polymerized in the presence of at least 2 wt% of a chain transfer agent
Implementation Method 2
The polymerization process may be carried out at a pressure in the range from 1000 to 4000 bar, preferably from 1200 to 2500 bar, and particularly 1600 to 2000 bar. The polymerization process may be carried out at a reaction temperature in the range of 150 to 300 °C, preferably 170 to 250 °C, and in particular 190 to 230 °C
Data Source
AI summary
The present invention relates to a continuous high-pressure polymerization process for the preparation of a liquid ethylene copolymer which comprises in polymerized form 20 to 60 wt% of ethylene; and at least 20 wt% of an acrylate, which is selected from C1-C22 alkyl (meth)acrylate, where a monomer feed comprising the ethylene and the acrylate is polymerized in the presence of at least 2 wt% of a chain transfer agent. The invention further relates to the liquid ethylene copolymer obtainable by the polymerization process; and to a lubricant comprising the liquid ethylene copolymer obtainable by the polymerization process; and to a method for reducing friction between moving surfaces comprising the step of contacting the surfaces with the lubricant or with the ethylene copolymer.