acid value

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Related to Acid number: Iodine number
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(chemistry) the amount of free acid present in fat as measured by the milligrams of potassium hydroxide needed to neutralize it

References in periodicals archive ?
Standard Test Method for Acid Number of Petroleum Products by Potentiometric Titration, 2006.
Acid number is defined as the number of milligrams of potassium hydroxide (KOH) necessary to neutralize one gram of biodiesel in order to provide the quantity of free fatty acids and acids originating from degradation reactions of biodiesel during the production process and its storage [25].
It was reported that the acid wash applied after the transesterification aiming to the removal the alkaline catalyst in order to avoid soap formation can be responsible for high acid numbers. An increase in the AV can cause deposits in the motor and corrosion problems [33].
Total Acid Number (mg KOH gm-1)###D-664###0.16###0.22###0.23###0.19###0.19###0.16###0.09###0.10###0.05 max
Meanwhile, these compounds, stronger in polarity, contributed to the enhancement of the acid number, increasing from 0.173 mg KOH/g in [EO.sub.180] to 10.450 mg KOH/g in [EO.sub.300].
With respect to acid number, if this parameter is too high, excessive engine corrosion can occur.
Acid number value must be low otherwise soap may be formed in the product
The lubricant in the sealed tubes was analyzed for total acid number (TAN) and by ion chromatography (IC) to determine refrigerant and/or lubricant decomposition.
The acid number of MA-g-SEBS was determined by titration method [22], A sample of 0.1 g was placed in a volumetric flask with 10 ml acetone, 10 ml hydrochloric acid (0.1 M) and 100 ml water.
And once the acid number reaches 0.3-0.4, carbon starts to form.
The effects of temperatures and initial process fluid concentrations on the Total Acid Number (TAN), Total Organic Acid (TOA) anion concentrations, metal concentrations, lubricant and/or refrigerant decomposition were determined.