AC Analytical Controls: AC SIMDIS ANALYZER / Thiết bị sắc kí khí mô phỏng chưng cất cho sản phẩm xăng dầu
Routine distillation tests are widely used to determine the boiling ranges of crude oils and their products. The
most common quality control test for boiling range distribution is the physical distillation method ASTM D 86.
Essentially a one-plate distillation, the D 86 test method is generally applicable to most commercial products.
ASTM D 1160 is available for higher boiling samples. Samples having a wide boiling range, such as crude oils,
can be partially characterized by the "true boiling point" method ASTM D 2892. The maximum reported boiling
point is about 400°C (750°F).
By using Gas Chromatography, a complete simulated distillation analysis can be performed in considerably less
time than a conventional true boiling point distillation, and requires minimal operator time. This technique of
simulated distillation is based upon the assumption that individual components of a sample elute from a gas
chromatographic (GC) column in order of their boiling point. The sample is introduced into a GC column that
separates hydrocarbons based on their boiling point properties. The column temperature is raised at a
reproducible rate, and the area under the chromatogram is recorded throughout the run. Boiling temperatures
are assigned to the time axis from a calibration curve obtained under the same conditions by running a known
mixture of hydrocarbons covering the boiling range expected in the sample. From these data, the boiling
range distribution is obtained.
The AC Simulated Distillation (SIMDIS) applications use gas chromatographic (GC) analysis to determine true
boiling point distribution up to 750°C of crude oil and crude oil fractions. Various solutions and standard
Methods are available as per table below. The Current Offering is highlighted.