Unlock Exclusive Discounts & Flash Sales! Click Here to Join the Deals on Every Wednesday!

Determination of Moisture Content in Pyrolysis Oil by Karl Fischer Titration (CAT#: STEM-PPA-0133-YJL)

Introduction

Pyrolysis oil is a dark brown organic liquid that mainly consists of a complex mixture of highly oxygenated compounds and water. Its composition depends on the biomass feedstock and the parameters during the pyrolysis process e.g. temperature, heating rate, vapor residence time, etc. Pyrolysis oil has several potential applications. It can be used as a substitute for fuel oil in static applications to generate heat and/or electricity, as an additive in transport fuels or as a source of value-added chemicals. To determine the most appropriate application, a thorough characterization of the pyrolysis oil is absolutely necessary.<br /><br />A substantial part of pyrolysis oil frequently consists of water. The water content influences the calorific value and the flow properties (viscosity) of the pyrolysis oil, both important parameters when is aimed at fuel applications.




Principle

Karl Fischer titration is used as a reference method for many substances and is a chemical analysis method based on the oxidation of sulfur dioxide by iodine in methanol hydroxide solution. Titration can be performed by volumetric or coulometric methods.
According to the volumetric method, an iodine-containing Karl Fischer solution is added until the first signs of iodine excess appear. Iodine turnover was determined by the volume of the burette containing iodine Karl Fischer solution.
In the coulometric procedure, reacted iodine is generated directly in the titration cell by electrochemical oxidation of iodide ions until traces of unreacted iodine are detected. Faraday's law can be used to calculate the amount of iodine produced by the required charge.

Applications

Food industry; Petroleum industry

Procedure

1. Pre-titrate the instrument.
2. Weigh the sample.
3. Pour the sample into the titration vessel.
4. Stir until the sample dissolves, and titrate to the end point with Karl Fischer titrant.
5. Enter the sample mass and record the moisture determination.

Materials

• Sample Type: Liquids, solids, slurries, even gases