Dry Screw Vacuum Pump for Aromatic Extraction Process

The aromatic hydrocarbon extraction device can not only reduce the benzene content in gasoline, improve the quality of gasoline, and protect the environment. More importantly, it can provide high-purity benzene, toluene, xylene and o-xylene and other basic raw materials to meet the growing needs of the petrochemical industry and chemical fiber industry, and the non-aromatic products after extraction can also be used as raw materials for the production of high-quality solvent oil.

This article is about aromatic hydrocarbon extraction process, especially an aromatic hydrocarbon extraction process in the fields of oil refining and petrochemical industry.   


The recovery tower in the aromatic hydrocarbon extraction device is an important unit for producing aromatic hydrocarbon products and recovering the solvent. Due to the limitation of the solvent degradation temperature, the recovery tower is generally designed to operate in a negative pressure environment. In the previous aromatics process, the vacuum system of the recovery tower is mainly realized by the steam jet pump, which consumes a lot of energy and produces a large amount of sewage during production, which is easy to cause pollution to the environment. In recent years, with the improvement of the equipment level in the petrochemical industry and the country's emphasis on energy conservation and emission reduction, the dry vacuum system has gradually replaced the traditional wet system.  


The dry vacuum pump system and the process steam do not pollute each other, and the process steam can be directly sent to the tail gas treatment system after being compressed and boosted by the dry screw vacuum pump.


Dry Screw Vacuum Pump Features 

  1. There is no medium in the working chamber, and a clean vacuum can be obtained.

  2. The surface of the working cavity and the screw rotor has anti-corrosion coating, which can adapt to harsh working conditions.

  3. The gas is not compressed in the pump, which is suitable for extracting condensable gas.

  4. A single screw vacuum pump can pump from the atmosphere to 1Pa, and the vacuum system can be greatly simplified.

  5. The water temperature has little effect on the vacuum, saves more than 90% of water, and even does not consume water.

  6. No fuel consumption, no dripping.

  7. There is no friction between the rotating parts, it can run at high speed, and the whole machine size is small.

  8. Simple structure and easy maintenance.

  9. The pumped gas is directly discharged from the pump body, no water pollution, no environmental protection pressure, and gas recovery is more convenient.

  10. It can be combined with roots vacuum pump and molecular pump to form an oil-free


From the performance characteristics of the screw vacuum pump, it can be seen that the dry vacuum pump used in the recovery system has significant energy saving and environmental protection effects, and the investment recovery period is short, which can create considerable economic and social benefits. At present, the application of dry screw vacuum pump in the extraction process of aromatic hydrocarbons, on the one hand, reduces the discharge of benzene-containing sewage from the device and reduces the pollution of the device to the environment, on the other hand, it can reduce operation cost and is good for environment. 


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