Application of Roots Vacuum Pump in Refinement of Petroleum Products
(1) Dry gas oil If the gas oil product contains a very small amount of water, the color will be cloudy and not bright, and the commercial price of the product will be greatly reduced. However, if the gas ha is drawn from the distillation unit, and then passed through a vacuum drying tower with only 37~112mmHg, the trace moisture in the gas oil can be basically removed, and the crystal clear product can be obtained.

(2) Extraction of lubricating oil with furfural In order to remove colloidal substances in lubricating oil, such as naphthenic hydrocarbons, aromatic hydrocarbons, sulfides and nitrides in polycyclic short side chains, and obtain high-grade lubricating oil, purification treatment is necessary. In a typical solvent refining process of liquid-liquid furfural extraction and refining, the productivity of raffinate oil is above 80% to 90%. The boiling point of furfural is 161.7 t, and superposition occurs when the temperature is higher than 230 °C. In order to avoid compounding, and to separate the product at a lower temperature, the decompression method must be adopted: the extracting liquid containing a large amount of furfural and unnecessary components is heated into the extracting liquid decompression tower (top of the tower) The residual pressure is 150~200mmHg), so that furfural is recovered, and other condensates and impurities are removed therein, and the raffinate containing a small amount of furfural is heated into the raffinate decompression tower, and furfural is recovered from the top of the tower. Refined lubricating oil is obtained at the bottom of the tower.

(3) Solvent dewaxing of petroleum products Aviation kerosene, diesel oil and light lubricating oil in petroleum products all contain more paraffin wax, and heavy lubricating oil and residual lubricating oil contain more ceresin wax , its content is sometimes as high as 25% or more, which makes some properties and fluidity worse. In addition, paraffin and ozokerite are important industrial raw materials, so petroleum products must be dewaxed.