Ionic Liquid Alkylation and Isomerization Integration
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Solution Overview
Problem
Conventional n-butane isomerization and alkylation processes are hindered by the sensitivity of catalysts to moisture, the hazards of hydrofluoric acid (HF) and sulfuric acid (H2SO4), and the difficulty in commercializing alternative solid catalysts, leading to high costs and operational challenges.
Innovation Solution
An integrated ionic liquid catalyzed alkylation and n-butane isomerization process that uses ionic liquid catalysts to simplify and enhance the efficiency of hydrocarbon conversion reactions, eliminating the need for extensive feed drying and reducing the number of distillation columns, capital expenditure, and hazardous catalysts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional AlCl3 or Pt-alumina catalysts are used for n-butane isomerization, then isomerization activity is achieved, but extensive feed drying is required due to catalyst sensitivity to moisture
Solution Approach 1:
The patent changes the chemical state of the catalyst from conventional solid AlCl3 or Pt-alumina to ionic liquid phase catalyst. This parameter change fundamentally alters the catalyst's interaction with moisture, eliminating the need for extensive feed drying while maintaining catalytic activity for n-butane isomerization.
Solution Approach 2:
The ionic liquid acts as an intermediary medium that enables isomerization without requiring strict moisture control. The ionic liquid phase mediates the reaction between n-butane and catalyst, providing a environment that is less sensitive to feedstock moisture compared to conventional catalysts.
2Productivity
If HF catalyst is used for alkylation, then high-octane gasoline production is achieved, but safety hazards due to HF volatility and corrosiveness increase
Solution Approach 1:
The patent employs ionic liquid catalysts that can be used in smaller quantities and potentially replaced or regenerated more easily than conventional HF systems. The ionic liquid phase allows for controlled reaction conditions that reduce safety hazards while maintaining alkylation productivity.
Solution Approach 2:
The ionic liquid creates a controlled reaction environment that is less hazardous than volatile HF. The ionic liquid phase acts as a safer medium that maintains the necessary catalytic function while reducing the safety risks associated with HF volatility and corrosiveness.
3Object-affected harmful factors
If H2SO4 is used as alternative catalyst to HF, then safety hazards are reduced, but capital and operating expenses increase significantly
Solution Approach 1:
The patent changes from conventional H2SO4 liquid acid catalyst to ionic liquid phase catalyst. This parameter change maintains the safety benefits of non-volatile catalyst while potentially reducing the capital and operating expenses associated with H2SO4 handling, storage, and regeneration infrastructure.
Solution Approach 2:
The ionic liquid represents a composite material that combines the benefits of liquid acid catalysis with enhanced safety and potentially reduced operational costs. The ionic liquid structure allows for tailored properties that can optimize both safety and economic performance compared to conventional H2SO4 systems.
4Object-affected harmful factors
If solid alkylation catalysts are used, then safety is improved compared to HF and H2SO4, but rapid fouling and deactivation prevent commercialization
Solution Approach 1:
The ionic liquid phase serves as an intermediary that prevents direct contact between the catalyst active sites and fouling compounds. This mediation effect maintains catalyst activity for extended periods while preserving the safety advantages of non-acidic catalyst systems.
Solution Approach 2:
The patent transitions from solid catalyst to ionic liquid phase catalyst, changing the physical state and chemical environment. This parameter change reduces fouling and deactivation rates while maintaining safety improvements over conventional acid catalysts.
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 integrated process simplifies feed handling, reduces capital and operating costs, and increases the efficiency of alkylation while avoiding the hazards associated with conventional HF and H2SO4 catalysts, providing a more efficient and safer alternative for producing high-octane gasoline and lubricants.
Implementation Method 1
contacting at least one isoparaffin and at least one olefin with an ionic liquid catalyst in an ionic liquid alkylation zone
Implementation Method 2
fractionating, via a distillation unit, an internal hydrocarbon feed to provide an n-butane containing fraction
Implementation Method 3
isomerizing at least a portion of the n-butane in the n-butane containing fraction to provide isobutane
Data Source
AI summary
Integrated isomerization and ionic liquid catalyzed alkylation processes may comprise integrating ionic liquid alkylation and n-butane isomerization using a common distillation unit for separating an n-butane containing fraction from at least one of an alkylation hydrocarbon phase from an ionic liquid alkylation reactor and an isomerization hydrocarbon stream from an isomerization unit. The n-butane containing fraction may undergo isomerization to provide an isomerization reactor effluent comprising the isomerization hydrocarbon stream. An isobutane containing fraction, separated from at least one of the alkylation hydrocarbon phase and the isomerization hydrocarbon stream, may be recycled from the distillation unit to the ionic liquid alkylation reactor.