Ethylene Vinyl Acetate Terpolymer Fuel Additive
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Solution Overview
Problem
Existing cold flow improvers for fuels and lubricants, particularly middle distillates, fail to adequately address the issue of paraffin crystallization at low temperatures, leading to clogging in fuel systems and boilers, and do not effectively balance solubility and filterability.
Innovation Solution
Copolymers composed of alpha-olefin, vinyl ester, and alpha-beta unsaturated monocarboxylic acid ester, specifically terpolymers of ethylene, vinyl acetate, and 2-ethyl acrylate, are used to improve the cold resistance of fuels and lubricants, preventing clogging while maintaining solubility and filterability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If conventional CFI additives (ethylene/unsaturated ester copolymers) are used to promote dispersion of paraffin crystals, then filterability is improved, but solubility deteriorates at low temperatures
Solution Approach 1:
The patent employs terpolymer copolymers comprising three distinct monomer units: alpha-olefin (30-90 mol%), vinyl ester (5-40 mol%), and unsaturated ester (5-40 mol%). This composite polymer structure combines the benefits of different monomer types to achieve both improved filterability and maintained solubility, resolving the contradiction between these two properties that plagues conventional binary copolymers.
Solution Approach 2:
The patent systematically varies the compositional parameters (monomer ratios, molecular weight, polydispersity index) of the terpolymer copolymers to optimize both filterability and solubility. By adjusting the mol% of each monomer unit and controlling molecular weight parameters, the invention finds the optimal parameter space where both filterability and solubility are simultaneously improved compared to conventional additives.
2Stability of the object's composition
If paraffin crystallization is allowed to occur at reduced temperatures, then fuel composition remains stable, but flow properties deteriorate significantly
Solution Approach 1:
The terpolymer copolymers act as intermediary substances that interact with paraffin crystals during crystallization. These copolymers adsorb onto crystal surfaces and modify the crystallization process, preventing the formation of large aggregated networks while maintaining the natural crystallization pathway. This intermediary action allows the fuel composition to remain stable while flow properties are preserved.
Solution Approach 2:
The patent effectively extracts or removes the harmful networking behavior of paraffin crystals through the action of terpolymer copolymers. By introducing these copolymers, the harmful crystal network formation is prevented, separating the beneficial crystallization (phase separation) from the harmful effect (network formation causing poor flow).
3Temperature
If existing CFI additives are used to lower pour point, then low-temperature flow is improved, but clogging in fuel systems still occurs
Solution Approach 1:
The terpolymer copolymers exhibit local quality differentiation in their molecular structure, with different monomer units providing different functional characteristics. The alpha-olefin units provide backbone structure, while the vinyl ester and unsaturated ester units provide specific interaction sites with paraffin crystals. This local differentiation allows the copolymer to simultaneously achieve pour point depression and prevent clogging by targeting different aspects of paraffin crystallization locally.
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
These copolymers effectively reduce the filterability temperature and pour point of fuels, minimizing the risk of clogging in fuel systems and boilers, and are particularly effective in both light and heavy middle distillates with low sulfur content.
Implementation Method 1
the crystallization of paraffins is a limiting factor in the use of middle distillates
Implementation Method 2
additives which promote the dispersion of paraffin crystals and thus prevent them from organizing into large networks
Data Source
AI summary
The invention pertains to the use, as an additive enhancing the low-temperature resistance and filterability of fuels, of at least one copolymer comprising from 78 to 87 mol% of at least one alpha-olefin, preferably at least ethylene, from 12 to 18 mol% of at least one vinyl ester, preferably at least vinyl acetate, from 1 to 4 mol% of at least one ester of alpha,beta unsaturated monocarboxylic acid, preferably at least 2-ethylhexyl acrylate.