Unsupported Ionic Liquid Catalyst for Low-Temperature Hydrocarbon Disproportionation
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Solution Overview
Problem
Current processes for hydrocarbon disproportionation and isomerization, particularly using ionic liquids, face challenges such as high temperatures, catalyst deactivation, and the need for expensive support materials, while also lacking clear product composition data and efficient conversion rates.
Innovation Solution
A hydrocarbon conversion process using an unsupported ionic liquid catalyst with a carbocation promoter, operating at temperatures below 200°C, which achieves significant disproportionation and isomerization of C5-C12 alkanes with improved conversion rates and reduced ionic liquid usage, producing a product mixture with desired Reid vapor pressure and octane number ranges.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If conventional catalysts (zeolites, sulfated zirconias, AlCl2/SiO2, ionic solids, platinum on Al2O3/Ga2O3) are used for hydrocarbon disproportionation, then the desired paraffin disproportionation reaction is achieved, but elevated temperatures (120-450°C) are required to carry out the transformation
Solution Approach 1:
The patent changes the temperature parameter by using ionic liquids as catalysts that enable disproportionation reactions to proceed at lower temperatures (below 200°C, preferably 50-150°C) compared to conventional catalysts that require 120-450°C. This parameter change reduces energy consumption while maintaining reaction efficiency.
Solution Approach 2:
The patent introduces ionic liquids as intermediary catalysts that mediate the disproportionation reaction between hydrocarbons. These ionic liquids act as a medium that facilitates the reaction at lower temperatures, bridging the gap between reactants and products without requiring the high temperatures needed by conventional catalysts.
2Temperature
If HF/TiF4 system is used for disproportionation at 51°C, then low temperature operation is achieved, but dangerous HF is utilized
Solution Approach 1:
The patent replaces the dangerous and toxic HF/TiF4 catalyst system with ionic liquids that can be easily disposed of or recycled. The ionic liquids serve as a safer alternative that eliminates the need for handling highly corrosive and toxic substances like HF, while still achieving low-temperature disproportionation.
Solution Approach 2:
The patent converts the harmful nature of traditional catalyst systems (HF/TiF4) into a benefit by using ionic liquids that are safer, more environmentally friendly, and can be designed with specific properties to optimize reaction performance. The ionic liquids transform a harmful catalytic system into a benign or easily manageable one.
3Temperature
If supported ionic liquid is used as catalyst, then active catalysis from 85-125°C is achieved, but the ionic liquid is deactivated by leaching from the support and support chemical reaction with acidic ionic liquid occurs
Solution Approach 1:
The patent extracts the ionic liquid from the support structure, using it as a free-flowing liquid catalyst rather than immobilizing it on solid supports. This extraction eliminates the problems of leaching and chemical reactions between the support and acidic ionic liquid, while maintaining catalytic activity at 85-125°C.
Solution Approach 2:
The patent creates a simplified catalyst system that copies the essential catalytic function of supported ionic liquids without the complex support structure. By using pure ionic liquids or ionic liquids with minimal additives, the system achieves the same catalytic activity without the stability problems introduced by support materials.
4Quantity of substance
If Brønsted acidic ionic liquid with stoichiometric acid concentration is used, then high acid concentration catalysis is achieved, but the organic cation is composed of Brønsted acid leading to high acid concentration
Solution Approach 1:
The patent applies local quality by using ionic liquids with specifically designed cations that provide just the right amount of Brønsted acidity needed for catalysis, rather than using highly concentrated acidic ionic liquids. This localized approach to acidity provides sufficient catalytic activity while minimizing harmful effects of excessive acid concentration.
Solution Approach 2:
The patent changes the acid concentration parameter by selecting ionic liquids with optimized acidity levels. Instead of using stoichiometric acid concentrations that can cause harmful effects, the patent uses ionic liquids with controlled acidities that provide effective catalysis with reduced harmful impacts.
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 disproportionates and isomerizes hydrocarbons with high selectivity and conversion rates, reducing the need for expensive catalysts and support materials, and provides a product with controlled vapor pressure and octane numbers, enhancing the efficiency and cost-effectiveness of hydrocarbon processing.
Implementation Method 1
A hydrocarbon conversion process using an unsupported ionic liquid catalyst with a carbocation promoter
Implementation Method 2
The liquid catalyst comprises an unsupported ionic liquid and a carbocation promoter
Data Source
AI summary
Processes for the disproportionation and isomerization of a C5 hydrocarbon feed using a liquid catalyst comprising an ionic liquid and a carbocation promoter are described. The ionic liquid is unsupported, and the reactions occur at temperatures below about 200° C.