Solvent extraction Back

Action Solvent extraction
Method Absorption/precipitation
Purpose Separate unsaturated oils
Feedstock Gas oil, reformate, distillate

High octane gasoline
Refined fuel

Product(s) goes to

Solvent dewaxing

Solvent extraction removes unsaturated aromatic hydrocarbons and impurities from lube and grease stocks by dissolving or precipitation. Solvent extraction prevents corrosion and protects catalyst in subsequent processes.

The feedstock is dried and treated by a continuous solvent treatment operation. Feedstock can be washed with a liquid in which the substances to be removed are more soluble than in the desired product; or selected solvents are added, causing impurities to precipitate. The solvent is separated from the product by heating, evaporation or fractionation.

Typical chemicals used in the extraction process include a wide variety of acids, alkalis and solvents, including NMP (n-methyl-2-pyrollidone), phenol or furfural, as well as oxidizing agents and adsorption agents. In the adsorption process, highly porous solid materials adsorb liquid compounds on their surfaces. The fact which type of process or chemical agents have to be chosen strongly depends on the nature of feedstock, contaminants and finished product requirements.

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)

Benefits of DMA Generation M at Solvent extraction

DMA 4100 M and DMA 4500 M can directly measure API gravity (calculated from true density), a necessary parameter for quality control of process samples coming from solvent extraction. The conversion from density to API gravity is implemented according to ASTM D1250 (product group B: refined products).  A sample changer is used for high sample throughput (Xsample 452) and allows for highly repeatable results (Xsample 352/452).