Recycle Ethylene Holding Drum Decompression
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Solution Overview
Problem
Existing methods for manufacturing high-pressure low-density polyethylene struggle with effectively separating and removing low molecular weight impurities, solvents, and lubricating oils, resulting in high smoke generation and a high number of fish eyes in films produced from the polymer.
Innovation Solution
The proposed apparatus and method involve a system with an ethylene supply line branching from a high-pressure recycle ethylene line to a recycle ethylene holding drum, decompressing and recycling ethylene, and using multiple compressors to manage ethylene pressure effectively, ensuring efficient separation of polyethylene and recycle ethylene, thereby reducing smoke and fish eyes in the final film product.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional high pressure polymerization methods are used, then polyethylene can be produced, but low molecular weight impurities including polymerization by-products, solvents, and lubricating oils are not effectively separated and removed
Solution Approach 1:
The separation system is divided into multiple stages: a first separator that separates polyethylene from reaction mixture at high pressure, a second separator that further separates impurities, and a third separator that removes remaining low molecular weight substances. This segmentation allows progressive purification without requiring a single complex separation unit.
Solution Approach 2:
A decompression tank is introduced as an intermediary device between the reactor and the separation system. The decompression tank allows controlled pressure reduction and preliminary separation of gas phase components, facilitating the subsequent separation processes and improving overall purification efficiency.
2Object-generated harmful factors
If conventional polymerization methods are used, then polyethylene can be manufactured, but the amount of smoke generated during processing is large
Solution Approach 1:
The separation and removal of low molecular weight impurities, solvents, and lubricating oils are performed in advance through the multi-stage separation system before the polyethylene undergoes further processing. By removing these impurities preliminarily, the source of smoke generation during subsequent processing is eliminated, reducing smoke emissions.
3Manufacturing precision
If conventional polymerization methods are used, then polyethylene can be produced, but the number of fish eyes contained in film is high
Solution Approach 1:
The separation process is segmented into multiple stages with each separator targeting different types and sizes of impurities. The first separator removes large polymerization by-products, the second separator removes solvent residues, and the third separator eliminates remaining low molecular weight substances. This segmented approach ensures comprehensive removal of fish eye-causing impurities while maintaining production efficiency.
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 approach results in a significant reduction in smoke generation and fish eyes in films, making the polyethylene suitable for various applications, including films, automotive parts, and industrial materials, with improved industrial applicability.
Implementation Method 1
a recycle ethylene holding drum (12) for holding decompressed recycle ethylene
Data Source
AI summary
Provided are an apparatus and a method for manufacturing high-pressure method low-density polyethylene, the apparatus and the method having excellent characteristics that the amount of smoke generated during processing of a polyethylene to be obtained is small, and the number of fish eyes contained in a film formed from the polyethylene is small. An apparatus for manufacturing high pressure method polyethylene includes: an ethylene supply line that is a line branched from a high pressure recycle ethylene line and connected to a recycle ethylene holding drum for decompressing high pressure recycle ethylene from the high pressure recycle ethylene line and supplying the decompressed recycle ethylene to the recycle ethylene holding drum; and the recycle ethylene holding drum that is a drum for holding the decompressed recycle ethylene through the ethylene supply line.