Reactor Flushing with Reversed Solvent Flow for Polymer Fouling
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Solution Overview
Problem
Polymer fouling in ethylene oligomerization reactors leads to undesirable reactor shutdowns and challenges in removal, necessitating improved flushing techniques to maintain reactor efficiency and reduce downtime.
Innovation Solution
A multi-stage flushing method involving an upward and downward flow of a flushing solvent within the reactor, initiated based on differential pressure thresholds, to effectively clean polymer fouling without opening the reactor to atmosphere, accompanied by solvent treatment and recycling to manage polymer content.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional flushing methods are used to remove polymer fouling, then the reactor can be cleaned, but the reactor must be opened to atmosphere which increases reactor downtime
Solution Approach 1:
The patent introduces an intermediary fluid system (flushing solvent circulated through a separate loop) that allows cleaning to occur without direct atmospheric exposure. The reactor remains sealed while the flushing solvent is pumped out, treated externally, and recirculated, thus mediating the cleaning process to avoid the need for opening the reactor to atmosphere.
Solution Approach 2:
The patent extracts the harmful polymer fouling from the reactor by circulating flushing solvent through a separate treatment loop. The solvent is pumped out of the reactor, the polymer is removed externally through treatment processes, and the cleaned solvent is returned to the reactor, effectively taking out the contaminant without opening the reactor vessel.
2Reliability
If mechanical cleaning methods are used to remove polymer fouling, then the reactor can be cleaned, but mechanical cleaning costs increase
Solution Approach 1:
The patent replaces mechanical cleaning methods (such as manual scraping or high-pressure water jetting) with a chemical flushing system. The flushing solvent chemically dissolves or loosens the polymer fouling, allowing it to be removed through fluid circulation and external treatment, thereby substituting mechanical intervention with a chemical process that reduces labor and equipment costs.
Solution Approach 2:
The patent implements a solvent recovery system where the flushing solvent is continuously pumped out, treated to remove polymer contaminants, and then recirculated back into the reactor. This recovery process eliminates the need for continuous disposal of cleaning materials and reduces the consumption of fresh solvent, thereby reducing overall cleaning costs.
3Reliability
If conventional flushing techniques are used, then polymer fouling can be removed, but chemical consumption costs increase
Solution Approach 1:
The patent implements a solvent recovery system where the flushing solvent is continuously pumped out, treated to remove polymer contaminants, and then recirculated back into the reactor. This recovery process eliminates the need for continuous disposal of cleaning materials and reduces the consumption of fresh solvent, thereby reducing overall cleaning costs.
Solution Approach 2:
The patent establishes a continuous flushing loop where the solvent is constantly circulated, treated, and recirculated. This continuous operation ensures that the solvent remains effective for polymer removal over extended periods, maximizing its utility and reducing the frequency of solvent replacement, thus lowering chemical consumption costs.
4Loss of substance
If no flushing is performed, then chemical consumption is minimized, but fouling rate during production increases leading to more frequent shutdowns
Solution Approach 1:
The patent establishes a continuous flushing loop where the solvent is constantly circulated, treated, and recirculated during reactor operation. This continuous operation ensures that the solvent remains effective for polymer removal over extended periods, maximizing its utility and reducing the frequency of solvent replacement, thus lowering chemical consumption costs.
Solution Approach 2:
The patent performs preliminary flushing actions during normal production operation rather than waiting for significant fouling to accumulate. By continuously circulating the flushing solvent through the reactor, polymer deposits are prevented from building up to problematic levels, reducing the need for intensive cleaning operations and associated chemical consumption.
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
Reduces reactor downtime, mechanical cleaning costs, and chemical consumption while minimizing fouling rates during production, enhancing reactor efficiency and system flexibility.
Implementation Method 1
an upward flow of a flushing solvent is generated within the reactor in a first stage, followed by a downward flow of flushing solvent within the reactor in a second stage
Implementation Method 2
provide an indication for polymer fouling in the reactor with the use of sensors that show an increase in differential pressure values beyond a certain threshold value
Implementation Method 3
multi-stage flushing technique where an upward flow of a flushing solvent is generated within the reactor
Data Source
AI summary
The disclosure provides a flushing process for removing polymer fouling from a reactor including a gas distributor proximal to the bottom thereof and an internal condenser proximal to the top thereof, the method including, for a first flushing time period, injecting a flushing solvent into the reactor and withdrawing the flushing solvent from a reactor outlet proximal to the internal condenser to induce an upward movement of flushing solvent, the withdrawn flushing solvent containing a first polymer content. After the first flushing time period is complete, for a second flushing time period, the process includes injecting a flushing solvent into the reactor and withdrawing the flushing solvent from a reactor outlet proximal to the gas distributor to induce a downward movement of flushing solvent, the withdrawn flushing solvent containing a second polymer content.