Buffered Ionic Liquid Catalyst Immobilization for Olefin Dimerization
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Solution Overview
Problem
Current methods for olefin dimerization lack efficient product separation, particularly for low-viscosity or gaseous olefins, and do not maximize catalytic performance due to the absence of buffering in ionic liquid systems.
Innovation Solution
A process involving modification of a support material with an alkylaluminum compound, mixing with a low-melting-point ionic liquid and an organometallic complex, and forming a buffered ionic liquid/catalyst complex, which is then immobilized and used with alpha-olefins for dimerization, optimizing catalytic performance and enabling easy product separation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If ionic liquids are used as catalysts for olefin dimerization, then catalytic activity is improved, but product separation becomes difficult due to low viscosity of the products
Solution Approach 1:
The patent employs porous support materials such as silica gel, alumina, or activated carbon to immobilize the ionic liquid catalyst. The porous structure provides high surface area for catalyst support while allowing product diffusion, enabling both high catalytic activity and easy product separation through simple filtration or decantation.
Solution Approach 2:
The invention creates a composite catalyst system combining ionic liquid, organometallic complex, and porous support material. This composite structure integrates the catalytic activity of ionic liquids with the separation advantages of solid supports, resolving the contradiction between catalytic performance and product separation ease.
2Ease of operation
If supported catalyst systems are used for olefin dimerization, then product separation is improved, but catalytic performance is reduced due to absence of buffering
Solution Approach 1:
The ionic liquid acts as an intermediary between the organometallic catalyst and the porous support. It provides the necessary buffering environment for high catalytic performance while being immobilized on the support to enable easy product separation, thus mediating between the two contradictory requirements.
Solution Approach 2:
The invention creates local buffering zones within the porous support structure where ionic liquids are immobilized. This allows catalytic performance optimization at the local catalyst site while maintaining the overall advantage of supported systems for product separation.
3Reliability
If high surface support materials are used, then catalytic performance is optimized, but device complexity increases due to immobilization procedures
Solution Approach 1:
The ionic liquid components self-assemble and immobilize on the porous support through natural interactions such as adsorption or coordination, without requiring complex external immobilization procedures. This self-service mechanism simplifies the overall process while maintaining high catalytic performance on high surface area supports.
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 allows for high-viscosity polyolefin production with efficient product separation and optimized catalytic performance, utilizing a supported system that can be used in fixed bed reactors, enhancing the yield and purity of dimerization products.
Implementation Method 1
modifying a support material containing —OH groups with an alkylaluminum compound to form a modified support material
Implementation Method 2
organometallic complex of the formula (I)... to form a buffered ionic liquid/catalyst complex... for dimerization
Data Source
AI summary
Methods for dimerizing alpha-olefins utilizing immobilized buffered catalysts wherein a buffered ionic liquid is mixed with an organometallic complex of the formula:where M is selected from the group of Ti, Zr, Hg, Ni, and V and R and R′ are selected from the group consisting of hydrogen, alkyl, aryl, alkenyl, alkynyl, alkyloxy, substituted aryl, and halogens, are provided.