Fast Trace Peroxide Analysis in Hydrocarbon Process Streams

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Overview

Diluted solutions of peroxides are used as catalysts or reaction initiators in petrochemical processes, also peroxides can be formed through auto-oxidation in certain classes of compounds including ethers, acetals, dienes, and alkyl aromatic hydrocarbons. 
Upon exposure to air the presence of peroxides could cause an explosion. Furthermore hydroperoxides in fuels have a deleterious effect on elastomers in fuel systems and peroxides reduce the octane rating in gasoline. To monitor the traces of reactive peroxides Da Vinci Laboratory Solutions has developed the Fast Peroxide Analyzer.

AUTOMATED ANALYSIS OF ACTIVE OXYGEN IN HYDROCARBON STREAMS

The DVLS Fast Peroxide Analyzer (FPA) is based on an HPLC stack including a quaternary pump, an automated sample introduction system, an UV detector and instrument control processing software. The analysis of Peroxide, as active Oxygen, is based on the oxidation of Iodide by Peroxide:

ROOH + 2I+ 2H → ROH + I2 + H2O

Two reagents: Acetic Acid in Propanol and Sodium Iodide in Propanol are mixed, resulting in a stream of acidified Iodine solution in Propanol. The sample is injected into this stream. Iodine is formed under temperature controlled conditions inside a dedicated reaction ovenmodule developed by Da Vinci. The HPLC UV detector spectrophotometrically determines the formed Iodine, which is proportional to the level of peroxide. The instrument software not only controls the optimal instrument conditions, but also automates the data analysis and reporting. The required analysis time is 7 minutes.

KEY BENEFITS OF FAST PEROXIDE ANALYZER
  • Safe alternative to traditional wet chemistry analysis methods such as ASTM D2340 en ASTM E299

  • Standard HPLC modules contribute to a precise determination of Peroxide

  • Fast analysis of only 7 minutes

  • Modular design saves benchspace