Unsupported Cesium Heteropolyacid Catalysts for Olefin Dimerization
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Solution Overview
Problem
Current catalysts for producing butene dimers and oligomers, such as MTBE and ethanol, face challenges including high production costs, environmental concerns, and inefficiencies in maintaining octane ratings and reducing emissions, while also being corrosive and prone to leaching, leading to the need for a more effective and sustainable octane enhancer.
Innovation Solution
The use of unsupported cesium substituted heteropolyacid catalysts for the dimerization and oligomerization of mixed butenes, which produces highly branched C8 and C8+ olefins under mild conditions, offering high selectivity and stability, and avoiding the drawbacks of traditional catalysts like zeolites.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If MTBE is used as an octane enhancer, then the octane rating is improved, but environmental pollution and health risks worsen
Solution Approach 1:
The patent changes the chemical composition parameter by replacing MTBE (an oxygenate) with hydrocarbon dimers and oligomers (C8-C12 olefins). This parameter change maintains octane enhancement capability while eliminating the environmental and health issues associated with MTBE, as the hydrocarbon products do not have the same pollution and carcinogenic concerns.
2Reliability
If ethanol is used as an octane enhancer, then the octane rating is improved, but production cost and energy content worsen
Solution Approach 1:
The patent changes the feedstock parameter from grain-based ethanol to petroleum-based mixed butenes. This parameter change eliminates the competition with food supplies and reduces production costs by utilizing readily available refinery streams. The catalytic dimerization/oligomerization process converts these butenes into high-octane hydrocarbons more economically than ethanol production.
3Productivity
If supported heteropolyacid catalysts are used, then catalytic activity is improved, but catalyst stability and selectivity worsen due to leaching
Solution Approach 1:
The patent extracts the heteropolyacid catalyst from its traditional supported form and uses it in an unsupported, suspended form. This extraction of the catalyst from the support structure eliminates the leaching problem that plagues supported catalysts. The unsupported heteropolyacid can be easily separated from the reaction mixture by filtration or decantation, maintaining both high catalytic activity and long-term stability without the deactivation issues associated with supported catalysts.
4Reliability
If alkylates are produced to enhance octane rating, then octane sensitivity is improved, but environmental friendliness worsens due to spent acids
Solution Approach 1:
The patent changes the chemical reaction pathway parameter from alkylation (which produces spent sulfuric acid or HF) to dimerization/oligomerization (which uses solid heteropolyacid catalysts). This parameter change eliminates the harmful spent acid waste stream while still producing high-octane hydrocarbons. The solid heteropolyacid catalyst can be easily separated and reused, avoiding the environmental and safety issues of liquid mineral acids.
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 results in high single-pass conversion and selectivity of C8 and C12 olefins, providing a non-corrosive, efficient, and environmentally friendly process for producing octane-enhancing fuel components with improved energy content and reduced Reid Vapor Pressure.
Implementation Method 1
unsupported metal (e.g., cesium) substituted heteropolyacid catalyst compositions useful for the production of butene dimers and/or oligomers through dimerization and oligomerization of mixed butenes
Data Source
Figure 1
AI summary
The present invention relates to unsupported metal (e.g., cesium) substituted heteropolyacid catalyst compositions useful for the production of butene dimers and/or oligomers from a mixed butenes feed, in which, under mild conditions, all isomers of mixed butenes produce highly branched C8 and C8+ olefins, useful as octane enhancers.