Supported Catalyst via Friedel-Crafts Alkylation
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Solution Overview
Problem
Existing catalyst systems for dimerization, oligomerization, and polymerization reactions face challenges in product separation and recyclability, particularly when using homogeneous catalysts, which are not easily separable from reactants and lack the advantages of heterogeneous catalysts in refinery environments.
Innovation Solution
A method is developed to create a supported catalyst by contacting a catalyst precursor with a support material containing terminal unsaturated groups using Friedel-Crafts alkylation, followed by activation with a co-catalyst, utilizing ionic liquids as Lewis acids and specific metal salts, to form a catalyst system suitable for fixed bed reactors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If homogeneous catalysts are used for dimerization and oligomerization reactions, then narrow weight distribution of products is achieved, but difficult separation of product from reactants occurs
Solution Approach 1:
The homogeneous catalyst system is segmented into two phases: a soluble catalyst precursor that remains in the liquid phase during reaction, and an insoluble support material (such as polyethylene or polypropylene) that provides physical separation. The catalyst precursor is anchored to the support, creating a heterogeneous structure that maintains the benefits of homogeneous catalysis while enabling easy separation through filtration or decantation.
Solution Approach 2:
An ionic liquid is introduced as an intermediary solvent that facilitates the reaction between the catalyst precursor and support material during the anchoring process. The ionic liquid enables controlled attachment of the catalyst to the support while maintaining catalyst activity, and can be removed or retained depending on the specific application requirements.
2Ease of manufacture
If heterogeneous catalysts are used for dimerization and oligomerization reactions, then easy product separation is achieved, but continuous manufacturing process capability is limited
Solution Approach 1:
The catalyst system transitions from a static heterogeneous catalyst to a dynamic system where the catalyst precursor can be replenished or regenerated. The supported catalyst precursor can be activated in situ, and the liquid phase can be continuously circulated through the reactor, enabling continuous manufacturing processes while maintaining easy separation capabilities.
3Ease of manufacture
If ionic liquids are used as catalysts or co-catalysts, then simplified product separation is achieved through immiscibility, but catalyst recyclability is reduced
Solution Approach 1:
The ionic liquid catalyst system is merged with an insoluble support material to create a hybrid catalyst. The catalyst precursor is anchored to the support, and the ionic liquid component can be retained on the support or in the reaction medium, enabling both easy product separation through phase immiscibility and catalyst recyclability through support retention.
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 supported catalyst system enables efficient dimerization and oligomerization reactions with high selectivity and ease of product separation, allowing for catalyst recycling and improved process efficiency in refinery settings.
Implementation Method 1
contacting a catalyst precursor comprising at least one aromatic group and at least one active catalytic metal with a support material comprising at least one terminal unsaturated group in the presence of a Lewis acid by Friedel Crafts alkylation to form a supported catalyst precursor
Implementation Method 2
contacting the supported catalyst precursor with a co-catalyst to form a supported catalyst
Data Source
AI summary
A method of making a heterogenously supported catalyst useful in dimerization, oligomerization or polymerization is provided in which a catalyst precursor containing a metal and an aromatic group are alkylated onto an oligomeric support having at least one terminal unsaturated group by Friedel Crafts alkylation.