Reduction of total acid number (TAN) of naphthenic acid (NA) using supercritical water for reducing corrosion problems of oil refineries

Pradip Chandra Mandal, Wahyudiono, Mitsuru Sasaki, Motonobu Goto

Research output: Contribution to journalArticlepeer-review

22 Citations (Scopus)

Abstract

Naphthenic acid (NA) are present in crude oil and lead to corrosion problems within the oil refineries. The objective of this study is to reduce total acid number (TAN) from NA in an environmentally benign way, suppressing the solid deposition using supercritical water (SCW). The reaction was carried out in an 8.8 mL batch reactor fabricated from Hastelloy C-276 with respective design temperature and pressure of 500°C and 50 MPa. The ability of SCW to reduce TAN was explored at temperatures from 400 to 490°C and water partial pressures (WPPs) from 0 to 45 MPa. Experimental results revealed that TAN removal was 83% at a temperature of 490°C, WPP of 45 MPa and reaction time of 90 min. The TAN removal followed first order kinetics, with Arrhenius parameters of activation energy 66 ± 4 kJ/mol and a pre-exponential factor (1.4 ± 0.2) × 10 5 s -1. Solid deposition was drastically reduced at WPP of 45 MPa. These results suggest that SCW is capable of reduction of TAN from NA with no use of catalyst or additives.

Original languageEnglish
Pages (from-to)620-623
Number of pages4
JournalFuel
Volume94
DOIs
Publication statusPublished - 2012 Apr
Externally publishedYes

Keywords

  • Batch reactor
  • Naphthenic acid
  • Solid deposition
  • Supercritical water
  • Total acid number

ASJC Scopus subject areas

  • Chemical Engineering(all)
  • Fuel Technology
  • Energy Engineering and Power Technology
  • Organic Chemistry

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