Gas plant Back

Action Treatment
Method Absorption
Purpose Recover hydrocarbons from gas streams
Feedstock Gas oil

Gases as ethane, butane, pentane, LPG

Product(s) goes to


There are two types of gas plants:

Saturated gas plants separate components from refinery gases, including butanes for alkylation, pentanes for gasoline blending, LPGs for fuel and ethane for petrochemicals. There are two different saturated gas processes: absorption-fractionation or straight fractionation. In absorption-fractionation, gases and liquids from various units are fed to an absorber/de-ethanizer where C2 and lighter fractions are separated by lean-oil absorption and removed for use as fuel gas or petrochemical feed. The remaining heavier fractions are stripped and sent to a debutanizer, and the lean oil is recycled back to the absorber/de-ethanizer. C3/C4 is separated from pentanes in the debutanizer, scrubbed to remove hydrogen sulphide, and fed to a splitter to separate propane and butane.

Unsaturated gas plants recover light hydrocarbons from wet gas streams from fluid catalytic crackers and delayed cokers. In a typical unsaturated gas plant, wet gases are compressed and treated with amine to remove hydrogen sulfide, either before or after entering a fractionating absorber where they are mixed with gasoline. The light fractions are separated in a boiler, offgas is sent to an absorber and the bottoms are sent to a debutanizer. A portion of the debutanized hydrocarbon is recycled; the rest goes to be separated. Overhead gases are used as alkylation unit feedstock.

By-products are sent further to amine treater & Claus plant to produce sulphur.

DMA Generation M

The DMA Generation M density meters measure the density and concentration of liquids. They provide preset measuring methods and integrated conversion tables for many applications. The FillingCheckTM function automatically detects filling errors and gas bubbles in the sample to avoid measuring errors.

Accuracy, density:
0.0001 g/cm³ (DMA 4100 M)
0.00005 g/cm³ (DMA 4500 M)
0.000005 g/cm³ (DMA 5000 M)

Repeatability s.d., density:
0.00005 g/cm³ (DMA 4100 M)
0.00001 g/cm³ (DMA 4500 M)
0.000001 g/cm³ (DMA 5000 M)

DMA 500

DMA 500 is a convenient, compact laboratory density meter providing renowned DMA measurement quality at the push of a button. Operations with DMA 500 are safe against voltage fluctuations and power outages due to the instrument’s integrated rechargeable battery, which also enables flexible off-the-line operation. The U-ViewTM live camera image of the measuring cell allows for visual inspection of the filling process and is supported by an automatic FillingCheckTM resulting in a high level user-support.

Accuracy, density:
0.001 g/cm3

Repeatability s.d., density:
0.0002 g/cm3

Min. sample volume:
approx. 1 mL

Maximum off-the-line operation:
2 h (optionally 6 h)

DMA 4200 M

The DMA 4200 M density meter determines density and specific gravity at sample pressures up to 500 bar and temperatures up to 200 °C. DMA 4200 M  is the expert solution for highly viscous samples with high melting points like bitumen, asphalt or tar, for volatile samples like fuel and gases like LPG (liquefied petroleum gas).

Density range:
0 to 3 g/cm3

Temperature range:
-10 °C to 200 °C

Pressure range:
0 bar to 500 bar

Accuracy, density:
0.0001 g/cm3