Autoclave Mixing Current Interface to Reduce Ethylene Decomposition
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Solution Overview
Problem
Autoclave polymerization processes face challenges with ethylene decomposition, which affects the efficiency and yield of polyolefin production.
Innovation Solution
The process involves mixing a reaction medium in an autoclave reactor using a rotating shaft with baffles and paddles to create specific mixing currents, with an interface offset from the inlet, enhancing the mixing of reaction components and reducing ethylene decomposition.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a conventional mixing system is used in autoclave polymerization, then the reaction medium can be mixed, but ethylene decomposition occurs reducing production efficiency
Solution Approach 1:
The mixing system is segmented into multiple functional elements: a rotating shaft with multiple paddles (at least three) positioned at different radial distances, creating distinct mixing zones. The paddles are arranged to generate multiple mixing currents that segment the reaction medium into different flow patterns, preventing localized ethylene decomposition while maintaining effective mixing throughout the polymerization zone
Solution Approach 2:
Different regions of the mixing system perform different functions: outer paddles create primary mixing currents for bulk mixing, while inner paddles generate secondary currents for localized mixing near the shaft. The interface between mixing currents is positioned at a specific radial distance to optimize local mixing quality and prevent ethylene decomposition in critical zones
2Stability of the object's composition
If mixing intensity is increased to improve mixing quality, then mixing efficiency improves, but ethylene decomposition increases
Solution Approach 1:
The mixing system creates dynamic flow patterns through multiple paddles rotating at different effective speeds due to their radial positions. This generates time-varying mixing currents that adapt to local conditions, providing intensive mixing where needed while maintaining gentler conditions in ethylene-sensitive zones, thus preventing decomposition while ensuring mixing quality
Solution Approach 2:
The interface between mixing currents acts as an intermediary zone where different flow patterns interact. This interface is positioned at a specific radial distance to mediate between high-intensity mixing regions and low-intensity regions, allowing effective mixing to occur while preventing excessive shear and decomposition in the polymerization zone
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
This configuration improves mixing and reduces ethylene decomposition, leading to higher conversion rates and better polyolefin production efficiency.
Implementation Method 1
mixing a reaction medium in an autoclave reactor with a rotating shaft, wherein the rotating shaft has a first baffle and a second baffle coupled to the rotating shaft
Implementation Method 2
creating in the polymerization zone a first mixing current, a second mixing current, and an interface located between the first mixing current and the second mixing current
Data Source
AI summary
Disclosed are a process and autoclave reactor configured to create, in a polymerization zone of the autoclave reactor, a first mixing current, a second mixing current, and an interface located between the first mixing current and the second mixing current, wherein the interface is offset from a reaction component inlet of the autoclave reactor that introduces a reaction component stream into the polymerization zone.