NMR-SABRE Hyperpolarization for Sulfur Detection
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Solution Overview
Problem
Current methods for detecting sulfur-containing compounds in fuels are limited by low sensitivity and high costs, particularly in refining crude oil and natural gas, where sulfur levels need to be tightly regulated, and existing NMR techniques struggle with detecting sulfur at part-per-million levels due to strong background signals and lengthy scan times.
Innovation Solution
The use of NMR-SABRE hyperpolarization techniques, involving the contact of sulfur-containing compounds with parahydrogen and a catalyst to enhance detection sensitivity, allowing for the transfer of spin order and subsequent NMR measurement in low-field magnetic environments, enabling the detection of sulfur-containing compounds at ppm levels with improved signal-to-noise ratios.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional NMR techniques are used to detect sulfur-containing compounds, then detection can be performed, but the detection sensitivity is low and scan times are lengthy
Solution Approach 1:
The patent applies preliminary action by performing SABRE hyperpolarization on sulfur-containing compounds before NMR detection. This pre-treatment step transfers spin order from parahydrogen to the sulfur compounds, dramatically enhancing their NMR signal intensity and enabling rapid detection at ppm levels without lengthy scan times
Solution Approach 2:
The patent changes the magnetic spin state parameter of sulfur-containing compounds from thermal equilibrium to hyperpolarized state through SABRE. This parameter change increases the population difference between spin states, thereby enhancing NMR signal intensity and improving detection sensitivity while reducing required scan time
2Measurement precision
If conventional NMR techniques are used to detect sulfur-containing compounds, then detection can be performed, but the background signals are strong and obscure the sulfur signals
Solution Approach 1:
The patent uses parahydrogen as an intermediary to transfer spin order to sulfur-containing compounds. This intermediary approach allows selective hyperpolarization of sulfur compounds without enhancing the background signals from other components, thereby improving the signal-to-noise ratio
Solution Approach 2:
By performing SABRE hyperpolarization as a preliminary step before NMR detection, the patent selectively enhances only the sulfur-containing compound signals while leaving background signals unchanged. This selective enhancement dramatically improves the signal-to-noise ratio and makes sulfur detection possible despite strong background interference
3Measurement precision
If high-field NMR equipment is used to improve detection sensitivity, then sensitivity increases, but the cost and device complexity increase
Solution Approach 1:
The patent replaces the need for high-field NMR equipment with a chemical hyperpolarization approach. By using SABRE to generate hyperpolarized sulfur compounds, the method achieves high detection sensitivity on low-field, cost-effective NMR equipment, thereby substituting expensive mechanical infrastructure with a chemical solution
4Reliability
If sulfur levels in fuel are reduced to meet EPA regulations, then environmental compliance improves, but the refining complexity and cost increase
Solution Approach 1:
The patent enables self-service monitoring where the detection method itself provides the compliance verification needed for regulatory reporting. By using SABRE hyperpolarization for rapid, sensitive detection of sulfur at ppm levels, refineries can self-verify compliance without complex external testing infrastructure
Solution Approach 2:
The patent changes the detection parameter from bulk sulfur measurement to trace-level sulfur detection at ppm levels. This parameter change enables precise monitoring of sulfur removal efficiency, allowing refineries to optimize their sulfur removal processes to meet EPA regulations while minimizing refining complexity and cost
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 enhances detection sensitivity, allowing for the detection of sulfur-containing compounds in fuels at ppm levels, reducing detection time and costs, and enabling the use of low-field NMR equipment while maintaining high sensitivity, thus addressing the regulatory requirements for sulfur levels in fuels.
Implementation Method 1
NMR-SABRE hyperpolarization of the sulfur-containing compounds in the sample
Implementation Method 2
a spin order can be transferred from the parahydrogen to the sulfur-containing compound therebyhyperpolarizing the sulfur-containing compound during a temporary association of the parahydrogen, the sulfur-containing compound, and the catalyst
Data Source
AI summary
Methods of detecting a sulfur-containing compound in a sample are described, for example using NMR-SABRE hyperpolarization of the sulfur-containing compounds in the sample. The methods can comprise, for example, contacting a sample comprising a sulfur-containing compound with parahydrogen and a catalyst to form a mixture. A spin order can be transferred from the parahydrogen to the sulfur-containing compound thereby hyperpolarizing the sulfur-containing compound during a temporary association of the parahydrogen, the sulfur-containing compound, and the catalyst. The methods can further comprise, for example, performing an NMR measurement on the mixture comprising the hyperpolarized sulfur-containing compound to detect the hyperpolarized sulfur-containing compound (e.g., from the hyperpolarized NMR signals. In some examples, the methods described herein can be used for detecting a sulfur-containing contaminant in a fuel.