Olefin Polymerization Reactor Feed Point Segmentation
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Solution Overview
Problem
Current polymerization processes in olefin reactors often face inefficiencies in introducing reaction components, particularly during start-up and steady-state operations, where catalyst activity and impurity management are critical, leading to suboptimal production rates and reactor stability.
Innovation Solution
Introducing reaction components, such as scavengers, comonomers, and condensing agents, at multiple locations within the reactor system, including the recycle loop and polymer separation system, with varying proportions at different times to optimize catalyst activity and impurity management, thereby preventing direct introduction to the reactor via fresh feed lines.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If reaction components are introduced through a single introduction point directly to the reactor, then the process is simple to operate, but catalyst activity is suboptimal and impurity management is poor
Solution Approach 1:
The patent divides the single introduction point into multiple introduction points located at different positions in the reactor system. Reaction components are introduced through at least a first and second introduction point, with the first introduction point positioned to allow components to enter the reactor indirectly (not directly nor via fresh feed lines), thereby segmenting the feed strategy to improve catalyst activity and impurity management while maintaining operational simplicity
Solution Approach 2:
The patent uses an intermediary introduction pathway where reaction components enter the reactor indirectly through the first introduction point rather than directly. This intermediary route allows for better control of component distribution and timing, improving catalyst performance and impurity management without requiring complex direct injection systems
2Productivity
If reaction components are introduced at constant proportions through multiple locations, then impurity management is improved, but production rate optimization is limited
Solution Approach 1:
The patent implements dynamic control of reaction component proportions by introducing components at different rates through the first and second introduction points during different operational phases. The proportion of reaction components introduced through each point varies over time, allowing optimization of production rate while maintaining ease of operation through a standardized multi-point introduction system
Solution Approach 2:
The patent employs periodic variation in the introduction rates of reaction components through the multiple introduction points. By alternating the proportions of components introduced through the first and second points during different time periods (including pre-start-up, start-up, and steady-state phases), the system optimizes production rate while maintaining operational simplicity
3Object-generated harmful factors
If components are introduced directly to the reactor via fresh feed lines, then the introduction process is simple, but agglomerate formation increases
Solution Approach 1:
The patent extracts the direct introduction pathway from the system by positioning the first introduction point such that reaction components do not enter the reactor directly nor via fresh feed lines. This removal of the direct pathway prevents agglomerate formation by allowing components to mix and distribute more uniformly before entering the reactor, while the overall system remains relatively simple
Solution Approach 2:
The patent introduces an intermediary pathway through the first introduction point that routes reaction components through an indirect path before they reach the reactor. This intermediary route prevents direct contact that causes agglomeration, allowing components to be better distributed and mixed, while maintaining introduction pathway simplicity
4Reliability
If catalyst is introduced during start-up phase, then production can begin, but impurity levels affect catalyst activity
Solution Approach 1:
The patent performs preliminary introduction of reaction components through the first and second introduction points during the pre-start-up and start-up phases before full production begins. By introducing components at controlled proportions through multiple points during this preliminary period, the system prepares the reactor environment to minimize impurity effects on catalyst activity while readying for production, thereby reducing the impact of impurities without extending start-up time
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 enhances catalyst performance, reduces impurity-related issues, and maintains reactor stability by strategically managing component introduction, leading to improved production rates and reduced agglomerate formation.
Implementation Method 1
The recycle stream is cooled to a temperature at which liquid components condense out of the gas phase
Implementation Method 2
the vaporisation of the condensed liquid components in the reactor provides significant cooling to the reaction
Data Source
Figure 1
AI summary
The present invention relates to a process for the polymerisation of olefins in a polymerisation reactor system and in particular provides a process for the polymerisation of olefins in a polymerisation reactor system, the polymerisation reactor system comprising at least first and second introduction points by which the same reaction component may be introduced directly at different locations on the reactor system, wherein i) at a first time the reaction component is introduced through at least the first introduction point and such that a proportion X of the reaction component which is introduced through said first and second introduction points is introduced through the first introduction point, and ii) at a second, later, time the same reaction component is introduced through at least the second introduction point and such that a proportion Y of the reaction component which is introduced through said first and second introduction points is introduced through the first introduction point, wherein Y is less than X, and further wherein at least one of the first and second introduction points is located on the reactor system at a location not on the reactor.