petrochemicals, oil & gas ASTM D8045 Metrohm and industry leaders develop superior method for Acid Number of crude oil and petroleum products
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etrohm is pleased to announce that the ASTM has published method D8045 for the determination of Acid Number (AN) in crude oil and petroleum products. The new method describes thermometric titration and was developed by Metrohm, together with industry leaders, using the 859 Titrotherm titrator. Method D8045 demonstrates the superiority of thermometric titration for complex petroleum samples, as it provides for better reproducibility of results, is significantly faster, and consumes less reagent than the commonly used method D664. Thermometric titration uses a highly sensitive, fast-responding temperature sensor that
detects the reaction endpoint based on the enthalpy change in the solution. This method requires no sensor maintenance aside from a solvent rinse, needs no hydration and requires no calibration. New chemistries used in ASTM D8045 significantly lower the cost per analysis as the new method consumes less solvent, saving substantial costs on waste disposal. Acid Number is a critical quality control parameter for crude oil and petroleum products. The accuracy of the AN results has a significant influence on the commercial value of crude oil and the profitability of a refinery. Moreover, acidic compounds lead to corrosion in petroleum refining and transportation infrastructure, therefore accurate AN measurements are necessary for safe operation. Given the commercial and corrosion impact of acidic compounds monitored by AN titrations, this new method is critical to qualitycontrol laboratories throughout the industry.
METROHM SA (PTY) LTD Tel: (011) 656 1918 CPT: (021) 852 0213 DBN: (031) 265 0067 Fax: (011) 656 2698 078 643 7113 info@metrohm.co.za www.metrohm.co.za
17 Issue 5 2019
Development of the new ASTM D8193 standard method for oil-in-water measurement By Dr. Niklas Christensson, Eralytics, Austria
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onitoring of hydrocarbons in discharge water requires simple yet reliable and sensitive analytical methods. IR methods were once the method of choice for this application due to its speed, simplicity and sub-ppm precision. However, the ban of the required CFC solvents lead to a demise of the IR methods and they have now largely been replaced by gravimetric or gas chromatography methods, despite the inability of these methods to correctly measure the high or low end of the molecular weight distribution of the sample (e.g. loss of light ends). ASTM D8193 is a new ASTM standard combining all the inherent advantages of IR methods for oil in water testing with an eco-friendly and readily available extraction solvent. The method uses liquid-liquid extraction with cyclohexane and quantifies the presence of oil and greases in the extract via the absorption of infrared
radiation due to methyl bending vibration. The IR measurement of the extract is carried out in a dual-beam non-dispersive IR spectrometer, making the standard an economical alternative to other analytical methods. The test method has a method detection limit of 0.5 mg/L and covers the range from 0.51000 mg/L for both total oil and grease (TOG) as well as total petroleum hydrocarbon (TPH; non-polar part of the sample). As an IR method, ASTM D8193 is able to measure a larger fraction of the molecular weight distribution of the sample as compared to other analytical methods and can thus provide consistent measurements of widely different compositions.
WIRSAM SCIENTIFIC Tel: (011) 482 1060 marketing@wirsam.com www.wirsam.com
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2018/11/30 10:16
