High Viscosity PAO Production via Olefin Segmentation
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Solution Overview
Problem
Current methods for producing high viscosity polyalphaolefins (PAOs) lack flexibility in choosing feed olefin/olefin mixtures, making it economically challenging to achieve high viscosity PAOs with adequate low temperature performance suitable for industrial lubricants.
Innovation Solution
A process involving the co-feeding of a linear alpha olefin mixture comprising hexene, dodecene, and tetradecene, optionally with octene or decene, into a reaction vessel and oligomerizing them in the presence of an aluminum chloride-water complex to produce PAOs with viscosities between 20 and 100 cSt at 100°C, achieving desired low temperature properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If high molecular weight olefins (greater than 1-decene) are used in oligomerization, then the viscosity of the resulting PAO increases, but the pour point increases (worsening low temperature performance)
Solution Approach 1:
The olefin feedstock is segmented into multiple components with different carbon numbers (C8, C10, C12, C14) rather than using a single high molecular weight olefin. This segmentation allows the oligomerization process to produce a distributed molecular weight product that achieves high viscosity while maintaining low pour point through the contribution of lower molecular weight segments
Solution Approach 2:
The invention changes the parameter of olefin feed composition from conventional single-olefin or binary mixtures to a quaternary mixture of C8-C14 olefins. This parameter change in feed composition enables simultaneous achievement of high viscosity and low pour point by controlling the distribution of oligomer molecular weights produced
2Adaptability or versatility
If conventional oligomerization processes are used with limited olefin choices, then the production process is simpler, but the ability to achieve both high viscosity and low pour point is reduced
Solution Approach 1:
The oligomerization process is designed with multi-functionality to handle four different olefin components (C8, C10, C12, C14) simultaneously in a single reactor system. This universal process capability allows flexible feedstock selection while maintaining relatively simple process operation through the use of a single catalyst system and continuous processing mode
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 effectively produces high viscosity PAOs with excellent low temperature performance, characterized by low pour points and viscosity indices comparable to commercially produced PAOs, using a mixture of hexene, dodecene, and tetradecene, which are suitable as lubricant base stocks.
Implementation Method 1
oligomerizing them in the presence of an aluminum chloride-water complex to produce PAOs with viscosities between 20 and 100 cSt at 100°C
Data Source
AI summary
This invention relates to the use of olefin mixtures containing 1-hexene/1-decene/1-dodecene and, additionally, 1-octene or 1-decene to produce high viscosity polyalphaolefins (PAOs) having a viscosity of from about 40 cSt to about 100 cSt at 100° C. (ASTM D-445) and a number average molecular weight of between about 1200 to about 4000, particularly useful as lubricant base stocks.