MaTestLab > Test Standards > ASTM D7169 Boiling Point Distribution of Samples with Residues Such as Crude Oils and Atmospheric and Vacuum Residues by High-Temperature Gas Chromatography
ASTM D7169 Boiling Point Distribution of Samples with Residues Such as Crude Oils and Atmospheric and Vacuum Residues by High-Temperature Gas Chromatography
ASTM D7169 test method includes high-temperature gas chromatography to identify the boiling point distribution and cut point intervals of petroleum products and to determine potential mass percent yield of products. It uses thin capillary columns, causing incomplete separation of C4-C8 resulting in unreliable boiling point distribution which leads to the approximate determination of the net chromatographic area. Results of the ASTM D7169 test are expressed in Inch-pound units. ASTM D7169 test method is used to determine the boiling point distribution through a temperature of 720 °C that corresponds to the elution of n-C100.
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Introduction to ASTM D7169
ASTM D7169 measures the boiling point distributions of crude oil and residues through gas chromatography. It is highly significant because of its application in oil refinery industries. The Boiling point distribution of crude oils, vacuum residues, and other petroleum fractions is important for refinery operation, which helps to determine the potential mass percent yield and determine the economics of the refining process.
In the ASTM D7169 test method simulated distillation is applied to samples that do not elute completely from the chromatographic system. The ASTM D7169 test method is used to determine the boiling point distribution through a temperature of 720 °C, the temperature corresponding to the elution of n-C100.
Test Procedure of ASTM D7169
Specimen Selection
ASTM D7169 involves selecting a representative sample however the specimens must be treated according to the amount of their volatile component.
Test Setup and Execution
ASTM D7169 involves a gas chromatographic method that uses an inlet and capillary column with a temperature program, a flame ionization detector, and data acquisition software. A retention time calibration mixture is used to develop a retention time versus boiling point curve. A detector response factor is determined using a solution of Reference Oil 5010. Solvent injections are made, and the sample solution is injected, and the amount of recovered sample is calculated.
ASTM D7169 Test Specimens
Specimen Details
ASTM D7169 indicates that specimens that have an initial boiling point of 100 °C or higher, such as vacuum residues or atmospheric residues require to be heated between 35 and 40 °C.
Specimen dimensions
ASTM D7169 indicates that solid or semi-solid specimens require heating up to 60°C for weighing.
Results of ASTM D7169
ASTM D7169 results in a chromatogram and boiling point distribution curve that provides information about the properties and behavior of crude oils and petroleum residues, especially in refining and petrochemical processes. Moreover, ASTM D7169 plays a significant role in characterizing and classifying complex hydrocarbon mixtures, aiding in quality control, product development, and process optimization within the oil and gas industry.
Tests Relevant to ASTM D7169
The tests relevant to ASTM D7169 include ASTM D2887 (Standard Test Method for Boiling Range Distribution of Petroleum Fractions by Gas Chromatography), ASTM D5307 (Standard Test Method for Determination of Boiling Range Distribution of Crude Petroleum by Gas Chromatography), and ASTM D6352 (Standard Test Method for Boiling Range Distribution of Petroleum Distillates in Boiling Range from 174 to 700°C by Gas Chromatography).
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