Phenolic Stabilizers for Ethylene Copolymerization
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Solution Overview
Problem
High-pressure ethylene copolymerization processes face challenges with runaway reactions and ethylene degradation due to excess initiators, leading to productivity losses and maintenance costs, as existing methods do not effectively stabilize these reactions.
Innovation Solution
The use of phenolic compounds, specifically those of formula (I), is introduced to stabilize ethylene copolymerization reactions under high pressure by reducing the sensitivity of ethylene to initiators, thereby limiting decomposition into carbon, methane, and hydrogen, and improving productivity and reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If high pressure and temperature are used to increase polymerization rate, then productivity is improved, but runaway reactions and ethylene decomposition occur
Solution Approach 1:
A phenolic compound is introduced as an intermediary substance to mediate between the polymerization reaction and ethylene decomposition. The phenolic compound selectively interacts with peroxide radicals to suppress ethylene decomposition while allowing polymerization to proceed, thus resolving the contradiction between productivity and reaction stability
Solution Approach 2:
The invention changes the chemical environment by introducing phenolic compounds that modify the radical reaction pathways. This parameter change in the reaction system allows maintaining high temperature and pressure conditions while preventing runaway reactions through selective radical scavenging
2Productivity
If excess initiators are used to increase polymerization speed, then productivity is improved, but ethylene decomposition increases
Solution Approach 1:
The phenolic compound acts as an intermediary that selectively interacts with peroxide radicals generated from initiators. It suppresses the harmful decomposition pathway while maintaining the useful polymerization pathway, allowing excess initiators to be used without increasing decomposition
Solution Approach 2:
The phenolic compound converts the harmful effect of excess initiator radicals (which cause decomposition) into a beneficial effect by selectively quenching decomposition-promoting radicals while allowing polymerization radicals to proceed, thus transforming potential harm into process control
3Productivity
If preheating is applied to improve initiator decomposition efficiency, then polymerization efficiency is improved, but fouling of reactor walls occurs
Solution Approach 1:
The phenolic compound serves as an intermediary that prevents parasitic polymerization during preheating by scavenging radicals that would otherwise cause wall fouling. This allows efficient preheating and initiator decomposition without the harmful side effect of fouling
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 phenolic compounds significantly reduce the frequency of ethylene decomposition, enhancing the productivity of ethylene copolymerization processes and minimizing maintenance costs associated with decomposition issues, outperforming existing stabilizers like butylated hydroxytoluene under the same conditions.
Implementation Method 1
the phenolic compound(s) have the advantage of significantly reducing the frequency of decomposition of ethylene compared to the use of butylated hydroxytoluene under the same conditions
Data Source
AI summary
The present invention relates to the use of one or more phenolic compounds, as defined below, to stabilise high-pressure ethylene copolymerisation reactions. The invention likewise relates to a method for preparing an ethylene copolymer under high pressure in the presence of one or more phenolic compounds, as defined below, and one or more initiators.