acid value


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acid value

[′as·əd ′val·yü]
Also known as acid number.
(chemistry)
The acidity of a solution expressed in terms of normality.
(organic chemistry)
A number indicating the amount of nonesterified fatty acid present in a sample of fat or fatty oil as determined by alkaline titration.
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In order to confirm the conversion of FFA during the process, the samplings were done manually and the acid value was calculated from the acidity reduction using
Acid Value (mg KOH / g Oil)###0.46 +- 0.01b###0.51 +- 0.02c###0.41 +- 0.015a
The mean stearic acid content in the [F.sub.1] seeds from the cross between HA 89 and CAS-20 was 41 g [kg.sup.-1], which was not statistically different from the stearic acid value in the parent HA 89 (Table 2).
Determination of the peroxide value (PV) as an indicator of the original products of oxidation was performed according to the procedure described in PN-ISO 3960-2016 [26], whereas the acid value (AV) was found by the method described in PN-ISO 660-2010 [27].
The fuel properties of the biodiesel produced including specific gravity (kg/L), cetane number, oxidative stability (h), kinematic viscosity (mm2/s, 40AdegC), lubricity (HFRR, um), cloud point (AdegC), pour point (AdegC), flash point (AdegF), cold filter plugging point (AdegC), copper strip corrosion (100AdegC, 3h), sulfur content (ppm), distillation temperature (AdegC), bottom sediments and water (B.SandW) (% vol.), free glycerin (%), acid value (mg KOH/g) and ash content (%) were analyzed according to ASTM methods.
The acid value of the esterified biodiesel after the first step and methyl ester after the second step was determined by the acid base titration technique.
The reason for the MUFA values found in this study was higher compared to oleic acid value, whereas the reason for the lower SFA value is the lower palmitic acid value.
A biodiesel with low acid number is considered safe for storage and transport, while those with acid value above specifications can cause corrosion during storage and various operational problems such as engine deposits, filter clogging and fuel deterioration [8].
Acid value (AV), peroxide value (POV), fatty acid composition, color, and phospholipid content were determined according to the standard methods of the International Union of Pure and Applied Chemistry for analysis of oils and fats.