Diene Value (DV) is a key parameter in refining and petrochemical processes. Even small amounts of conjugated dienes can lead to product instability, catalyst issues, and costly downtime. The traditional UOP 326 method is widely used, but it involves manual steps, hazardous chemicals, and limited sensitivity. To make DV testing faster, safer, and more reliable, Da Vinci Laboratory Solutions developed the Diene Value Analyzer—a fully automated and precise alternative that determines DV in just 5 minutes.
The DVLS Diene Value Analyzer is based on an Agilent HPLC stack and uses a Diels–Alder reaction with a selective colorimetric reagent to quantify total diene content through a decrease in UV/Vis absorbance. The automated HPLC platform eliminates wet chemical handling and manual labor, reducing operator exposure and minimizing workflow variability. The system includes an isocratic pump with degassing, an automatic liquid sampler, a UV/Vis detector, the DVLS Reaction Module for controlled heating, and CDS software for fully automated data processing.
The DVLS Reaction Module ensures stable and repeatable reaction conditions through precise temperature control and uniform heat distribution across an inert reaction coil. Installed seamlessly between the autosampler and detector, the module integrates smoothly into the HPLC stack. A built-in cooling zone at the coil outlet ensures reagents and products are cooled before entering the UV/Vis detector. The oven supports temperatures up to 225 °C (437 °F).
Tests with pygas samples using the DV Analyzer were compared with UOP 326, GC-MS/FID, and GC-VUV. The results demonstrate strong correlation with GC-MS/FID and GC-VUV while also showing better recovery than the traditional UOP method. The DV Analyzer consistently detects Diene Values from 0.5–100, outperforming the UOP method in both speed and low-level detection across all sample types.
Key Features & Benefits
