Improving acid number testing of biodiesel feedstock and product

A. Kovács, I. Czinkota, J. Tóth

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

The acidity of low and high free fatty acid containing feedstock varieties and biodiesel production intermediary products were tested using a variety of standard methods by the use of manual and automatic titration apparatus. The objective was to select the optimal test method for intermediary products in biodiesel processing and to optimize the selected technique by reducing the extent of bias.We found that there are two major reasons for variations in electrode potential readings. Colloid chemistry has an impact on the initial phase of titration by breakage and reformulation of the partially disperse system. Electric and magnetic fields in the titration beaker were the main reasons for sensitive fluctuations in electrode potentials in the potential range of interest for acid number readings. Refluxing the analyte with the diluting solvent proved to be an efficient technique to offset the influence of colloid processes. Addition of a filter electrolyte to the titration solvent allowed the filter fluctuations to be related to changes in uniformity of electric and magnetic fields in the titration beaker. Addition of filter electrolyte improved signal reliability than shading the external noises by wrapping the titration beaker in aluminium foil. Mathematical interpretation of potential readings revealed the extent of improvement in electrode potential fluctuation by the techniques employed. Both the aqueous and non-aqueous titration are suitable for accurate testing the acid number of biodiesel feedstock and intermediary products.

Original languageEnglish
Pages (from-to)409-417
Number of pages9
JournalJAOCS, Journal of the American Oil Chemists' Society
Volume89
Issue number3
DOIs
Publication statusPublished - Mar 2012

Fingerprint

Biofuels
Biodiesel
Titration
Feedstocks
Acids
Testing
Electrolytes
Electrodes
Colloid chemistry
Electric fields
Magnetic fields
Aluminum foil
Colloids
Fatty acids
Nonesterified Fatty Acids
Acidity
Processing

Keywords

  • Acid number
  • Acid-base titration
  • Biodiesel
  • Repeatability
  • Solvent

ASJC Scopus subject areas

  • Chemical Engineering(all)
  • Organic Chemistry

Cite this

Improving acid number testing of biodiesel feedstock and product. / Kovács, A.; Czinkota, I.; Tóth, J.

In: JAOCS, Journal of the American Oil Chemists' Society, Vol. 89, No. 3, 03.2012, p. 409-417.

Research output: Contribution to journalArticle

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