ASTM D6560 (석유 아스팔텐 시험)

ASTM 석유 아스팔텐 시험

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ASTM D3279-12:  n-Heptane Insoluble 시험 방법

이 시험 방법은 고체 또는 반고체상태의 석유 아스팔텐, 가스 오일, 중유 또는 최고 온도가 343ºC인 원유에 적용된다.

This test method is applicable to all solid and semi-solid petroleum asphalt, gas oils, heavy oils and crude petroleum that has been topped to a cut-point of 343C.

For this Mtd, a suitable sample size (typically varying from 0.5-0.6g for Air blown asphalt, 0.7-0.8g asphalt paving binders & crude residues, 1.0-1.3 g for Gas oil and heavy oil) is weigh in a Erlenmeyer flask and n-heptane is added in the ratio of 100 mL solvent per 1g of sample. The Erlenmeyer flask and its content is then heated on a magnetic-stirrer hot plate to yield a gentle refluxing under a reflux condenser for a period of 15-20 mins (when testing asphalt binders, fuel oils, gas oils and crude residues) or 25-30 mins (when testing air blown asphalt). At the end of reflux period, the mixture is allowed to cool to room temperature for a period of 1 hour. The mixture is then warmed to 38 -49C on a hot plate before pouring it through a filter set-up in a Gooch crucible using a gentle vacuum. At the end of filtration step, the crucible is placed in an oven at 110C for a period of 30 mins and then allowed to cool prior to weighing. From the weight of precipitate [n-Heptane insoluble (NHI)] accumulated on the filter paper and the weight of original sample used, the mass % of asphaltene, defined as n-Heptane insoluble (NHI), is determined.

ASTM D6560-00: Std Test Mtd for determination of Asphaltene (Heptane Insolubles) in Crude Petroleum & Petroleum Products

In this test method, a portion of the sample (typically 10g or less and topped to an oil temperature of 260C) is mixed with heptane in a round-bottom flask at a ratio of 30mL solvent per 1g of sample. The mixture is heated under reflux for approx. 60 mins and at the end of this period, the mixture is allowed to cool to room temperature and stored in dark cupboard for 90-150 mins. The precipitated asphaltenes, waxy substances, and inorganic material that are insoluble in n-heptane are collected on a filter paper that is folded in a special way to prevent loss of asphaltene by creeping. The waxy substances collected on the filter paper are removed by washing with hot heptane in an extractor. After removal of the waxy substances, the asphaltenes are separated from the inorganic material by dissolution in hot toluene, the extraction solvent is evaporated, and the asphaltenes weighed. From the weight of precipitate [n-Heptane insoluble (NHI)] accumulated on the filter paper and the weight of original sample used, the mass % of asphaltene, defined as n-Heptane insoluble (NHI), is determined.

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