Acetonitrile Analysis


Application Summary

Analysis Point / Parameter Analyte Typ. Range Suitable Analyzer
Quality Control Purity 80-100 %T OMA Process Analyzer

Measuring Purity in Acetonitrile

Generated as a by-product of acrylonitrile manufacture, acetonitrile is used as a solvent in butadiene purification and as a component in batteries. The purity of acetonitrile must be verified to ensure suitability for these industrial uses.

The traditional offline method for acetonitrile quality control relies on pulling samples for lab analysis. The lab system compares the sample's UV transmittance at a few wavelengths (220 nm, 240 nm, 275 nm, 350 nm) to that of demineralized water at the same wavelengths. Since pure acetonitrile has zero absorbance in the UV range, a simple principle applies: higher transmittance = higher purity.

The OMA Acetonitrile Purity Analyzer applies the same principle but with enormous advantages, including: (1) analyzer response time is 1 to 5 seconds, as opposed to slow sample transport for discrete lab measurements; (2) fast response for immediately pinpointing changes in stream purity; (3) totally automated sampling system normalizes measurement by Auto Zero; (4) installation of system close to sampling point for convenience of process adjustment.