Asphaltene Dispersant Evaluation via Inert Packing Columns
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Solution Overview
Problem
Asphaltene precipitation in hydrocarbon-containing materials under elevated temperature and pressure conditions leads to issues such as pipeline plugging, reduced oil production, coke formation during thermal upgrading, and equipment fouling, necessitating effective methods to inhibit or prevent precipitation.
Innovation Solution
A method involving the use of inert packing columns subjected to temperature and pressure conditions, where asphaltene-precipitating solvents are used to capture and dissolve asphaltenes, allowing for the determination of asphaltene content before and after adding dispersant additives, enabling the selection and addition of effective dispersants to prevent precipitation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If dispersant additives are added to prevent asphaltene precipitation, then pipeline plugging and equipment fouling are reduced, but processing complexity and cost increase
Solution Approach 1:
The patent replaces complex mechanical testing systems with a simplified analytical chemistry approach using HPLC and UV-Vis spectroscopy to evaluate dispersant effectiveness, reducing equipment complexity while maintaining reliability assessment capability
Solution Approach 2:
The patent changes the evaluation parameters from complex field testing to measurable laboratory parameters (asphaltene concentration, UV-Vis absorbance, HPLC retention time) that can quantify dispersant effectiveness without requiring complex processing systems
2Object-affected harmful factors
If severe upgrading processes are applied to reduce undesirable components, then environmental compliance is improved, but processing cost and energy consumption increase significantly
Solution Approach 1:
The patent applies preliminary action by evaluating and optimizing dispersant additives before severe upgrading processes, preventing asphaltene precipitation that would otherwise require energy-intensive coke removal and catalyst regeneration operations
Solution Approach 2:
The patent converts the harmful effect of asphaltenes (which typically require severe upgrading to remove) into a manageable issue by using dispersants to keep them in solution, allowing lighter, less energy-intensive processing while still achieving environmental compliance
3Quantity of substance
If asphaltenes are allowed to precipitate under elevated temperature and pressure, then dispersant additive cost is reduced, but pipeline plugging and production loss occur
Solution Approach 1:
The patent implements feedback by establishing a measurement system (HPLC-UV-Vis) that quantifies asphaltene behavior under reservoir conditions, allowing optimization of dispersant concentration to the minimum effective level rather than using excessive amounts
Solution Approach 2:
The patent changes the approach from preventing precipitation entirely to controlling it through measured parameters, using laboratory data to determine the optimal dispersant concentration that maintains productivity while minimizing additive usage
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 method allows for the effective selection and addition of asphaltene dispersants, reducing precipitation, improving flow, and minimizing fouling in refinery components, thereby enhancing the processing of heavy crude oils and reducing operational costs.
Implementation Method 1
precipitating an amount of asphaltenes from a first hydrocarbon-containing material sample having solvated asphaltenes therein with one or more first asphaltene-precipitating mobile phase solvents
Implementation Method 2
dissolving an amount of the captured asphaltenes with one or more solvents to elute a fraction having dissolved asphaltenes therein
Data Source
AI summary
Disclosed herein is a method for determining the effectiveness of one or more asphaltene dispersant additives for inhibiting or preventing asphaltene precipitation in a hydrocarbon-containing material subjected to elevated temperature and pressure conditions.