Ionic Liquid Demulsifiers for Water-in-Oil Emulsion Separation
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Solution Overview
Problem
The stability of water-in-oil emulsions in oil and bitumen production is challenging due to natural surface-active components, making it difficult for conventional demulsifiers to efficiently break these emulsions, leading to operational issues and product quality problems.
Innovation Solution
The development and use of ionic liquid demulsifiers composed of amphiphilic quaternary ammonium cations and carboxylic acids, which are synthesized and applied in low concentrations to disrupt the interfacial layers, allowing for effective demulsification of water-in-oil emulsions in bitumen and heavy oil processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional demulsifiers are used to break water-in-oil emulsions, then some demulsification effect is achieved, but the efficiency is insufficient due to the stability provided by natural surface-active components
Solution Approach 1:
The patent changes the chemical parameters of demulsifiers by developing ionic liquid-based compounds with specific molecular structures (quaternary ammonium cations with carboxylate anions) and optimized alkyl chain lengths. This parameter change enables the demulsifier to effectively disrupt the stable interfacial layers formed by natural surface-active components, achieving over 90% water removal efficiency in short times.
Solution Approach 2:
The invention uses composite ionic liquid structures combining cationic and anionic components with specific functional groups. The amphiphilic nature of these composite molecules allows them to interact with both oil and water phases, effectively breaking the emulsion stability provided by complex polyaromatic compounds, salt ions, and fine solid particles.
2Productivity
If demulsifiers are applied in higher concentrations to improve demulsification speed, then water removal efficiency increases, but cost and environmental impact worsen
Solution Approach 1:
The ionic liquid demulsifiers exhibit high activity at low concentrations due to their optimized molecular parameters. The specific structure with quaternary ammonium cations and carboxylate anions allows effective emulsion breaking at concentrations that are lower than conventional demulsifiers, thereby improving productivity without increasing substance quantity.
Solution Approach 2:
The ionic liquid demulsifiers are designed to be effective at low dosages, reducing the quantity of chemical substance required. This approach makes the demulsification process more cost-effective and environmentally acceptable while maintaining high demulsification speed and efficiency.
3Reliability
If demulsifiers are used to break emulsions, then water removal is achieved, but operational issues such as fouling and corrosion persist due to emulsion instability
Solution Approach 1:
The optimized molecular parameters of the ionic liquid demulsifiers enable complete and stable emulsion breaking, achieving over 90% water removal. This thorough demulsification prevents the formation of stable residual emulsions that could cause fouling in transportation pipelines and corrosion in downstream refinery facilities, thereby eliminating operational problems while improving product quality.
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 demulsifiers demonstrate high demulsification efficiency, achieving over 90% water removal in short times with low concentrations, improving product quality and reducing operational issues, while being environmentally more acceptable than conventional demulsifiers.
Implementation Method 1
demulsifiers should have higher interfacial activity compared to the surface-active species present in oil. In this manner, they can be used to change the mechanical properties of stabilizing interfacial layers, as well as disrupting the stabilizing interfacial layers to provide favorable zones for coalescence between water droplets
Data Source
AI summary
Embodiments disclosed herein generally relate to ionic liquid demulsifiers for separation of water from water-in-oil emulsions. The ionic liquid demulsifiers may formed of an amphiphilic quaternary ammonium cation with general formula of R1R2R3N+CH3 (R1, R2, and R3 are alkyl chains with 6 to 12 carbon atoms) and an amphiphilic anion based on carboxylic acids. Anionic component can be based on linear unsaturated or saturated fatty acids with 8 to 18 carbon atoms, and cyclo-carboxylic acids containing cyclohexane, cyclopentane and naphthenic rings. The length of the alkyl chains and number of carbon atoms in the anionic components, as well as the operational parameters of demulsification process may be dependent on the water content and the nature of stabilizing species of the emulsions.