Isolation of organic matter by the NaOH-HCl method from two marine oil shales using oven and sealed autoclave techniques

Jameel S.Aljariri Alhesan, Marc Marshall, W. Roy Jackson, Ying Qi, Peter J. Cassidy, Alan L. Chaffee

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Organic matter (OM) was isolated from two marine oil shales, El-Lajjun and Julia Creek, using NaOH-HCl and humin and humic acid fractions separated. Two treatments were required to reduce humin ash yield to below 11 wt% db. The humin yield of the autoclave method was 80 wt% of OM (dry mineral-matter-free, dmmf), compared to only 20–60 wt% dmmf for the oven method, possibly due to the increased NaOH solution strength and some oxidation. Oven and autoclave methods both gave humin similar in chemical structure to shale OM, regardless of yield. This similarity has implications as to shale OM structure.

Original languageEnglish
Pages (from-to)197-213
Number of pages17
JournalOil Shale
Issue number2S
Publication statusPublished - 1 Jan 2019


  • Humin and humic acid
  • Marine oil shale
  • NaOH-HCl treatment
  • Organic matter
  • Oven and autoclave methods

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