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Table 1 Composition of REG-glycerol, REG-fatty acids and REG-glycerin bottom

From: Global changes in the proteome of Cupriavidus necator H16 during poly-(3-hydroxybutyrate) synthesis from various biodiesel by-product substrates

Component (%) REG-80 (glycerol) REG-FFA (free fatty acids) REG-GB (glycerol bottom)
Glycerin 78 (82)a ND 45–65 (54)
Potassium acetate <15 (10) ND ND
Moisture/volatiles <13 (11) <6 2 [0 (0.5)]
MONGa/fatty acids 0.02 (1.0) >60 (75) 20–35 (25)
Methyl esters 0.05 (0.3) 10–15
Methanol <1 0.25
Ash 20 (13)
Density (Kg/m3) 1.25 (1.23) 0.74–0.77 (7.5)
Insoluble impurities <2
Color Brown Brown Black
Energy content (Btu/lb) 5000–10,000 (7000) 12,000–14,000 (13,000) ND
  1. ND not determined (Provided by Renewable Energy Group, Saneca, IL)
  2. aFigures in parenthesis are average values