Ionic Liquid Alkylation Conversion of Sulfuric Acid Units
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Solution Overview
Problem
Conventional sulfuric acid (H2SO4) and hydrofluoric acid (HF) alkylation processes pose significant hazards and have not been effectively replaced by alternative catalysts, and existing sulfuric acid alkylation units are not suitable for ionic liquid catalyzed alkylation processes.
Innovation Solution
Converting existing sulfuric acid alkylation units into ionic liquid alkylation systems by integrating an ionic liquid alkylation reactor and modifying the fractionation unit to separate and recycle an HCl-rich C3- fraction, allowing for the use of ionic liquid catalyzed alkylation reactions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional H2SO4 or HF catalysts are used in alkylation processes, then alkylation reactions can be performed, but significant safety hazards and health risks are introduced
Solution Approach 1:
The patent changes the chemical nature of the catalyst from conventional strong acids (H2SO4/HF) to ionic liquids, fundamentally altering the catalytic system's parameters while maintaining alkylation functionality. This substitution eliminates the severe safety hazards associated with conventional catalysts while preserving reaction productivity
Solution Approach 2:
The patent employs ionic liquids as composite catalytic materials that combine the desirable catalytic properties needed for alkylation reactions with enhanced safety characteristics. These ionic liquid catalysts represent a composite approach that integrates multiple functional attributes into a single catalytic system
2Productivity
If H2SO4 is used as catalyst, then alkylation reactions proceed, but the acid becomes diluted by acid soluble oils requiring continuous withdrawal and reprocessing
Solution Approach 1:
The patent employs ionic liquid catalysts that can be easily separated from the reaction mixture and reused multiple times without significant loss of activity. This eliminates the need for continuous catalyst reprocessing that plagues conventional H2SO4 systems, as the ionic liquids maintain their integrity and catalytic function over extended operational periods
Solution Approach 2:
The patent implements a catalyst recovery system where ionic liquids are separated from the reaction products and reused. This recovering approach prevents catalyst dilution losses and eliminates the need for continuous reprocessing, as the ionic liquids can be efficiently recovered and maintained in their active state
3Ease of manufacture
If spent H2SO4 is transported to processing plants, then reprocessing can occur, but public exposure hazards increase due to road or rail accidents
Solution Approach 1:
The patent extracts the hazardous transport requirement from the overall process by using ionic liquid catalysts that remain contained within the existing refinery infrastructure. The catalysts are recovered and reused on-site, eliminating the need for external transport to specialized processing plants and thereby removing the associated public exposure hazards
4Object-affected harmful factors
If existing H2SO4 alkylation units are converted to ionic liquid systems, then safety hazards are reduced, but unit modification and integration are required
Solution Approach 1:
The patent designs the ionic liquid alkylation system to be compatible with existing H2SO4 unit infrastructure, allowing the same equipment to serve multiple catalytic systems. This multi-functionality approach reduces conversion complexity by enabling the existing units to handle ionic liquids with minimal modification while maintaining their original design capabilities
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 conversion enables the efficient and cost-effective commercialization of ionic liquid catalyzed alkylation processes, reducing hazards associated with H2SO4 and HF, and optimizing the separation and recycling of hydrocarbon phases.
Implementation Method 1
ionic liquid catalyzed alkylation reactions
Implementation Method 2
separating an alkylation reactor effluent of the ionic liquid alkylation reactor into an ionic liquid phase and a hydrocarbon phase
Data Source
AI summary
Methods for converting an H2SO4 alkylation unit to an ionic liquid alkylation system configured for performing ionic liquid catalyzed alkylation processes may comprise connecting at least one component configured for ionic liquid catalyzed alkylation to at least one component of the H2SO4 alkylation unit, wherein the at least one component of the H2SO4 alkylation unit is retained, modified or adapted for use in the ionic liquid alkylation system. Ionic liquid catalyzed alkylation systems derived from existing conventional alkylation units, and ionic liquid catalyzed alkylation processes are also disclosed.