Asphaltene Solubility Distribution via Inert PTFE Vessel
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Solution Overview
Problem
Existing methods for determining asphaltene content and solubility in hydrocarbon samples are limited by low solubility issues, leading to incompatibility in blending and potential coke or particle formation, and lack a reliable mechanism for screening different types of asphaltenes.
Innovation Solution
A method involving a vessel with inert packing and sidewall materials, using a combination of solvents like n-heptane and toluene for precipitation and dissolution, allows for precise characterization of asphaltenes through Evaporative Light Scattering Detector analysis, minimizing sidewall adsorption and enabling accurate determination of Insolubility Number and Solubility Blending Number.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional packing materials are used in the vessel, then separation can be performed, but asphaltene adsorption occurs leading to measurement errors
Solution Approach 1:
The vessel is packed with polytetrafluoroethylene (PTFE) particles, which provide an inert environment that prevents asphaltene adsorption. The PTFE packing material creates a chemically inert surface that does not interact with asphaltenes, eliminating the harmful adsorption effect while still enabling the separation and measurement process.
2Measurement precision
If the vessel interior surface is conventional material, then structural integrity is maintained, but asphaltene adsorption on sidewalls occurs
Solution Approach 1:
The vessel interior surface is made of polytetrafluoroethylene (PTFE), which provides an inert environment that prevents asphaltene adsorption on the sidewalls. This inert surface treatment eliminates the harmful interaction between asphaltenes and the vessel wall, ensuring accurate solubility measurements.
3Measurement precision
If precipitation solvents are used to determine asphaltene content, then solubility characteristics can be determined, but incompatibility issues arise in blending applications
Solution Approach 1:
The method segments the asphaltene population into different solubility classes by using a series of precipitation solvents with increasing aromaticity (n-heptane, toluene, and mixed solvents). Each solvent extracts asphaltenes with specific solubility characteristics, allowing the complex asphaltene mixture to be analyzed in discrete, manageable fractions that can be individually characterized and summed.
Solution Approach 2:
The method changes the chemical parameter of the precipitation solvent system by using different aromaticity levels (from non-aromatic n-heptane to aromatic toluene and their mixtures). This parameter variation allows systematic determination of asphaltene solubility distribution, providing insights into blending compatibility without causing actual incompatibility issues.
4Productivity
If automated determination methods are used, then analysis time is reduced, but complexity of the system increases
Solution Approach 1:
The PTFE-packed vessel serves multiple functions: it provides an inert adsorption-free surface, enables separation of asphaltenes from the solvent matrix, and facilitates automated analysis. The same basic vessel configuration can be used with different precipitation solvent systems, making the apparatus universally applicable to various asphaltene characterization needs without requiring complex specialized equipment for each analysis type.
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 approach provides improved accuracy in measuring asphaltene content and solubility distribution, reducing errors and enhancing compatibility of hydrocarbon samples for blending and processing, as demonstrated by reduced Insolubility Number values and increased blending capabilities.
Implementation Method 1
passing a solvated sample from the plurality of solvated samples into the vessel to form precipitated asphaltenes
Implementation Method 2
introducing a dissolution solvent into the vessel to solvate the precipitated asphaltenes
Implementation Method 3
The asphaltenes in the second solvent can then be detected by a suitable method, such as by using an Evaporative Light Scattering Detector
Data Source
AI summary
Systems and methods are provided for determining an asphaltene solubility distribution for a petroleum sample and/or other hydrocarbon sample. A vessel for performing the method can include both packing material(s) and sidewall(s) that correspond to substantially inert materials. The vessel can initially contain a precipitating solvent suitable for causing precipitation of asphaltenes from a hydrocarbon sample. Examples of a precipitating solvents can correspond to n-heptane, toluene, and mixtures of n-heptane and toluene. The petroleum sample is then introduced into the vessel, along with a carrier solvent. The volume of the precipitating solvent can be large relative to the sample, so that the solubility of asphaltenes in the sample becomes dependent on the properties of the precipitating solvent. If asphaltenes are precipitated, the asphaltenes can be washed out of the column using a dissolution solvent. The asphaltenes washed out using the dissolution solvent can then be characterized to determine a total asphaltene content.