Low-Temperature Chromium Catalyst Activation for Stable Oligomerization
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Solution Overview
Problem
Existing catalyst systems for producing alpha olefins such as 1-hexene and 1-octene are not storage stable and do not effectively solve the issues of catalyst stability and activity retention during storage.
Innovation Solution
A process for preparing an activated catalyst composition comprising contacting a chromium complex with an aluminoxane in an aromatic hydrocarbon solvent at low temperatures (e.g., less than 20°C) to form an activated catalyst composition that is stable for over 24 hours without loss of activity, reducing fouling solids, and maintaining high catalytic activity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the catalyst system is activated at conventional temperatures, then the activation process is efficient, but the catalyst loses stability and activity during storage
Solution Approach 1:
The patent applies parameter changes by conducting the activation process at low temperatures (below 20°C, preferably below 0°C) instead of conventional high temperatures. This temperature parameter modification allows the catalyst to achieve both stability for storage and maintained activity, resolving the contradiction between reliability and productivity.
2Duration of action of moving object
If the catalyst is stored for extended periods, then operational flexibility is improved, but catalyst activity is lost
Solution Approach 1:
The patent changes the temperature parameter during storage to below 20°C (preferably below 0°C), which preserves catalyst activity over extended storage periods. This allows the catalyst to maintain its functional properties while enabling longer storage duration and operational flexibility.
3Ease of manufacture
If conventional activation methods are used, then the process is simple, but fouling solids are generated
Solution Approach 1:
The patent modifies the temperature parameter of the activation process to below 20°C, which significantly reduces or eliminates the formation of fouling solids. This parameter change maintains process simplicity while eliminating the harmful byproducts associated with conventional high-temperature activation methods.
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 process results in reduced fouling solids and increased oligomer productivity, with the activated catalyst maintaining activity and stability for extended periods, suitable for ethylene oligomerization processes.
Implementation Method 1
contacting a mixture of a chromium complex in an aromatic hydrocarbon solvent with an aluminoxane at an activation temperature to form the activated catalyst composition
Data Source
AI summary
Preparations for storage-stable activated catalyst compositions comprising chromium complexes are disclosed herein. Oligomerization processes using the activated catalyst compositions produce a reduced amount of undesirable byproducts such as fouling solids, without a concomitant reduction in catalyst activity, yield, or selectivity.