Atmospheric distillation Back

Action Separation
Method Thermal
Purpose Separate major constituents (fraction)
Feedstock Desalted crude oil

Kerosene or middle distillates
Gas oil

Product(s) goes to

Gas plant
Catalytic isomerization
Catalytic hydrocracking
Catalytic cracking
Vacuum distillation
Residual treating & blending

Before entering the atmospheric distillation unit, the desalted crude is preheated in a furnace. It is then fed into the vertical distillation column from the bottom, at pressures slightly above atmospheric pressure and at elevated temperatures. All fractions except the heaviest ones vaporize. The fractions with lower boiling point (lighter fractions) exit the upper part of the tower and are directed to other units for further processing, treating, blending or distribution.

Fractions like fuel gas and light naphtha (low boiling point) are removed from the top of the tower as vapors. Light straight-run (SR) naphtha or gasoline is also taken from the upper section of the tower. These products are used as petrochemical and reformer feedstocks, gasoline blending stocks, solvents and LPGs.

Intermediate boiling range fractions, including gas oil, heavy SR naphtha and SR middle distillates, are removed from the middle section of the tower as side streams. These are sent to finishing operations for use as kerosene, diesel fuel, jet fuel, catalytic cracker feedstock and blending stocks.

The heavier fractions with higher boiling points (called residue, bottoms or topped crude), which remain at the bottom of the distillation tower, go to the vacuum distillation unit for further fractionating.

DMA 35 Ex Petrol

The DMA 35 portable density meter measures the density, SG and °API of samples on-site within seconds. The intrinsically safe instrument (ATEX-marking II 2 G Ex ib IIC T4) has a special housing, resistant to petroleum samples. It is therefore perfectly suitable for measuring petroleum samples in hazardous areas. The integrated RFID interface enables quick sample identification (e.g. tank number) before measurement. Measured results can be stored and printed or exported to a PC wirelessly via IrDA later on. The instrument fully complies with the ASTM D7777 standard.

0.001 g/cm3

Repeatability s. d.:
0.0005 g/cm3

Measuring range:
0 g/cm3 to 3 g/cm3

Minimum sample volume:
2 mL

Benefits of DMA 35 Ex Petrol at Atmospheric distillation

The DMA 35 Ex Petrol portable density meter measures the API gravity, API SG or API density (calculated from true density) of the different liquid fractions coming from the distillation tower (product group B: refined products) directly at the sampling location for quick identification. It automatically displays the measured value, already compensated to your reference temperature of choice.