Crude Oil Characterization via Time of Flight Mass Spectrometry
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Solution Overview
Problem
The traditional crude oil assay method is costly and time-consuming, requiring extensive distillation and fractionation to determine the indicative properties of crude oil fractions, which hinders efficient processing and valuation in refineries.
Innovation Solution
The method employs Time of Flight Mass Spectrometry (TOF-MS) to predict indicative properties such as cetane number, pour point, cloud point, aniline point, and aromaticity of crude oil fractions without the need for fractionation, using density and TOF-MS measurements to classify and value crude oils more efficiently.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional crude oil assay method with distillation and fractionation is used, then accurate compositional and property information is obtained, but the process becomes costly and time-consuming
Solution Approach 1:
The patent extracts only the essential information needed for crude oil characterization by using NMR spectroscopy to directly measure key parameters (aromatic carbon content, alkyl side chain length, etc.) without performing complete distillation and fractionation. This selective extraction of critical data eliminates unnecessary analytical steps while maintaining measurement precision for the most important compositional parameters.
Solution Approach 2:
The patent replaces the mechanical/thermal separation process (distillation and fractionation) with a spectroscopic measurement system (NMR). Instead of physically separating crude oil into boiling point fractions through heating and condensation, the NMR instrument directly characterizes the molecular structure and composition of the crude oil sample, substituting a complex thermal-mechanical process with a rapid analytical measurement.
2Loss of information
If traditional crude oil assay method with multiple distillation cuts is used, then detailed fraction properties are determined, but the process complexity and cost increase
Solution Approach 1:
The patent makes the NMR instrument perform multiple characterization functions simultaneously - determining aromatic content, alkyl chain length, cycloparaffin content, and other compositional parameters from a single measurement. This multi-functional approach replaces the need for multiple specialized analytical instruments and procedures that would otherwise be required to obtain the same comprehensive information from different distillation fractions.
Solution Approach 2:
The patent changes the measurement parameters from indirect proxies (boiling point ranges, refractive indices, density measurements of fractions) to direct molecular structural parameters (NMR chemical shifts, integration areas corresponding to specific carbon types). This parameter transformation enables direct quantification of compositional information without requiring physical fractionation into boiling point cuts.
3Measurement precision
If extensive distillation and fractionation is performed to determine crude oil properties, then comprehensive assay data is obtained, but productivity of refinery operations decreases
Solution Approach 1:
The patent performs preliminary characterization of crude oil composition and properties using NMR before the crude oil enters the refinery processing stream. By obtaining key compositional data (aromatic content, alkyl chain length, etc.) in advance, refinery operators can make immediate decisions about optimal processing conditions, unit operations sequencing, and product yield predictions, eliminating the delay caused by waiting for traditional assay results.
Solution Approach 2:
The patent skips the time-consuming intermediate steps of distillation, fraction collection, and individual fraction analysis by using NMR to directly characterize the whole crude oil sample. This rushing through the analytical process achieves the essential characterization goal in a single rapid measurement rather than through a lengthy multi-step procedure, thereby maintaining measurement precision while dramatically improving productivity.
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 significantly reduces the time and cost associated with crude oil analysis, enabling quicker decision-making and more efficient processing by providing accurate predictive data for crude oil properties without the need for extensive distillation.
Implementation Method 1
time of flight mass spectrometry (TOF-MS)
Implementation Method 2
atmospheric pressure photoionization (APPI) source
Implementation Method 3
atmospheric pressure photoionization (APPI) source
Data Source
AI summary
A system and computer program product are provided for calculating one or more indicative properties, e.g., one or more of the cetane number, octane number, pour point, cloud point, octane number, and aniline point of oil fractions, from the density and time of flight mass spectrometry (TOF-MS) of a sample of an oil sample.