Ionic Liquid Catalyst for Low-Sulfur Alkylate Fuel
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Solution Overview
Problem
Current paraffin alkylation processes in refineries rely on hazardous and environmentally unfriendly catalysts like sulphuric acid and hydrofluoric acid, which pose safety risks and environmental concerns, and require large acid volumes, while also limiting the operating pressure of hydrogen reformers due to catalyst fouling, necessitating a safer and more environmentally friendly alternative.
Innovation Solution
The use of an ionic liquid catalyst system, specifically a mixture of acidic ionic liquids and alkyl halides, for the alkylation of iso-butane with C3-C5 olefins to produce low-sulfur alkylate gasoline, which reduces sulfur content to less than 10 ppm and offers safer handling and reduced environmental impact.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If sulphuric acid or hydrofluoric acid is used as catalyst in paraffin alkylation, then high quality alkylate with high octane number is produced, but safety risks and environmental hazards increase due to the hazardous nature of these acids
Solution Approach 1:
The invention changes the chemical nature of the catalyst from traditional strong mineral acids (H2SO4, HF) to ionic liquids with tunable acidity. By modifying the ionic liquid composition (e.g., using imidazolium or pyridinium cations with various anions), the catalyst maintains high alkylation activity while eliminating the hazardous properties of conventional acids, thus producing high quality alkylate without safety and environmental risks
Solution Approach 2:
The invention uses composite ionic liquid systems combining organic cations (imidazolium, pyridinium, ammonium) with inorganic or organic anions (BF4-, PF6-, CF3SO3-, CF3COO-). This composite approach creates a catalyst that exhibits both the desired catalytic activity for high quality alkylate production and the safety/environmental benefits of non-hazardous materials
2Productivity
If large volumes of sulphuric acid are used as catalyst, then alkylation reaction proceeds effectively, but the need for handling and regenerating large volumes of spent acid becomes a disadvantage
Solution Approach 1:
The ionic liquid catalyst is designed to be reusable and regenerable. After alkylation, the ionic liquid can be separated from the product and regenerated by simple washing or heating processes, eliminating the need for continuous large-volume acid handling and regeneration operations required by conventional sulphuric acid processes
Solution Approach 2:
The invention enables easy separation and recovery of the ionic liquid catalyst from the alkylate product through phase separation or distillation. The recovered ionic liquid can be reused multiple times, significantly reducing the quantity of catalyst that needs to be continuously handled and disposed of compared to traditional acid processes
3Productivity
If hydrofluoric acid is used as catalyst with on-site regeneration capability, then daily make-up of HF is minimal, but aerosol formation presents environmental risk and requires additional safety measures
Solution Approach 1:
The ionic liquid catalyst can be used in smaller quantities and replaced or regenerated more frequently without the environmental risks associated with HF aerosols. The catalyst system allows for simpler safety operations without requiring complex aerosol control systems like water sprays and catalyst additives needed in HF processes
4Use of energy by moving object
If conventional Platinum/Rhenium reforming catalysts are used in hydrogen reformer, then hydrogen production is maintained, but catalyst fouling increases when operating pressure is lowered, shortening catalyst run length
Solution Approach 1:
The invention develops low-sulphur alkylate gasoline (less than 10 ppm sulphur) using ionic liquid catalysts. This low-sulphur fuel reduces sulphur contamination in the reformer feedstock, thereby reducing catalyst fouling and extending catalyst run length while allowing the reformer to operate at lower pressures for improved hydrogen production efficiency
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 ionic liquid catalyst system effectively produces low-sulfur alkylate gasoline with sulfur content below 10 ppm, improving safety and environmental sustainability by minimizing hazardous chemical handling and reducing catalyst fouling, thus addressing the limitations of traditional acid-based processes.
Implementation Method 1
contacting a hydrocarbon stream comprising at least one olefin having from 2 to 6 carbon atoms and at least one paraffin having from 4 to 6 carbon atoms with an ionic liquid catalyst and a halide additive in an alkylation reaction zone
Data Source
AI summary
A method for producing a low sulphur containing fuel from a hydrocarbon feed having from 10 to 80 ppm of sulphur is disclosed. The method comprises contacting a hydrocarbon stream comprising at least one olefin having from 2 to 6 carbon atoms and at least one paraffin having from 4 to 6 carbon atoms with an ionic liquid catalyst and a halide containing additive in an alkylation reaction zone under alkylating conditions to produce a fuel having sulphur content up to 10 ppm.