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Process Raman Analyzers for Olefins Monitoring
Olefins directly affect fuel stability, emissions performance, and regulatory compliance in gasoline production. Refiners who can't measure olefin concentration in real time are stuck relying on delayed lab results to catch problems that have already moved downstream. HORIBA Process Instruments' PI-200 series process Raman analyzers close that gap, giving refiners a real-time analyzer for olefins production that measures concentration continuously and non-invasively, directly in the process stream.
Your Simple, Cost-Efficient Turnkey Solution
HORIBA Process Instruments' process Raman systems for olefin monitoring are built for real-time process optimization, regulatory compliance, and product quality control in gasoline production. Our analyzers integrate directly into existing blend header infrastructure, giving refiners continuous visibility into olefin concentration without adding sampling complexity or lab turnaround time to the process.
Why Olefins Content Matters in Gasoline Production
Olefins are a blending input for blenders to optimize cost, but they're also a regulated parameter with hard limits. The U.S. EPA requires refiners to measure and report total olefin content in gasoline because olefinic hydrocarbons are reactive in the atmosphere and contribute to photochemical smog formation. Refiners demonstrate compliance using ASTM D1319 (fluorescent indicator adsorption) or the EPA-accepted D6839 alternative (gas chromatography), and exceeding permitted olefin limits means non-compliant fuel.
Beyond regulatory exposure, high olefin concentrations reduce oxidative stability, accelerating gum formation in storage and fuel systems and degrading long-term product quality.
Lab-based ASTM methods like D1319 and D6839 remain the standard for certification and compliance reporting. However, they confirm compliance after the fact, run as scheduled lab samples rather than continuous measurement. That approach doesn't give operators the real-time visibility needed to correct a blend before it drifts out of specification.
How Process Raman Analyzers Measure Olefins
Olefin Determination: Distinct Spectral Peaks for Precise Differentiation
Raman spectra reveal distinct olefin peaks in the 1640–1680 cm⁻¹ region, allowing for precise differentiation between gasoline grades. A comparative analysis of regular and premium gasoline shows higher olefin concentrations in regular gasoline than in premium gasoline. The ability to measure different olefin concentrations in real time demonstrates Raman's capability to quantify key compositional differences directly in the process stream.
Olefins Model: Predicting Concentration with PLS Regression
Using partial least squares (PLS) regression models, Process Raman analyzers achieve exceptional accuracy in predicting olefin concentrations. A typical online PLS analysis demonstrates a strong correlation between Raman-predicted and laboratory-measured values, with a standard error of prediction of just 0.48% over a range of 0-23% total olefin concentration.
Olefins Model Validation
Validation of the PLS model on an independent dataset comprising 939 samples shows a similarly low standard error of prediction at 0.60%.
Raman vs. Traditional Olefin Testing Methods
Lab-based ASTM methods like D1319 and D6839 remain the standard for certification and compliance reporting. Process Raman takes your refinery's D1319 and D6839 reference method results and helps control the feedback loop during production: instead of waiting on a periodic grab sample and lab turnaround, operators get continuous olefin data at the blend header, in time to correct a blend before it drifts out of specification.
Why HORIBA Process Raman for Olefins Monitoring?
Olefins produce a strong, distinct Raman signal that's difficult to isolate with NIR-based analyzers, making Raman spectroscopy particularly well suited to this application. Combined with continuous, real-time measurement at the point of blending, refiners get the visibility needed to maintain compliance, protect fuel stability, and avoid off-spec production, without interrupting the process or adding sampling infrastructure.
HORIBA's Process Raman systems bring the power of molecular spectroscopy directly into gasoline production, giving refiners the tools to stay ahead of both regulatory requirements and product quality standards.
Resources
At HORIBA Process Instruments, we are committed to more than just delivering cutting-edge Raman technology—we aim to empower you with the knowledge and tools to excel in your industry. Our Resources & Knowledge Base is your go-to hub for expert insights, technical documentation, and best practices to optimize your process monitoring and analysis.
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