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Vacuum Distillation Unit

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A vacuum distillation unit is a piece of equipment used in the refining and petrochemical industries to separate and purify different components of crude oil or other complex mixtures. This process is carried out under reduced pressure, typically achieved by creating a vacuum in the distillation column. By lowering the boiling point of the various components, vacuum distillation allows for the separation of substances that would otherwise have similar boiling points at atmospheric pressure. This technique is particularly useful for separating high-boiling point compounds, such as heavy hydrocarbons, from lower-boiling point ones.

As a leader in vacuum pump products for vacuum distillation, Vacculex has been committed to providing reliable solutions to our customers since our inception. With a wide range of vacuum pump options, we offer flexibility and efficiency for various distillation applications.

Vacuum Pump For Vacuum Distillation Unit

Usually the most common vacuum pump used in vacuum distillation is dry screw vacuum pump and roots booster pump. Please consult Vacculex’s engineers and explore our wide range of products below to see how we can meet your specific needs in the field of vacuum distillation

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MB Series Mechanical Vacuum Booster - Vacculex
MB Series Mechanical Vacuum Booster
Dry Screw Vacuum Pump - Vacculex
VSP Series Screw Vacuum Pump

Advantages Of Using Vacuum Pump For Vacuum Distillation Unit

Dry Screw Vacuum Pumps

Advantages of screw vacuum pumps in vacuum distillation

  • High vacuum: Screw vacuum pumps provide high vacuum levels to ensure the effectiveness of various reactions and processes in the chemical industry. Screw vacuum pumps can not only form a separate vacuum system, but also can be used as a backingpump combining Roots pumps to form a vacuum system applied in the field of distillation, can achieve a higher vacuum and maintain a large pumping speed, not only can provide stable and good prerequisites for the operation of the Roots vacuum pumps, but also reduce the number of Roots pumps configuration, compared with the same commonly used liquid ring pumps used as a backing pump in the field of distillation of the chemical industry, can be adjusted from the original two-stage Roots + liquid ring to one-stage Roots + screw, so that the combination of dry vacuum unit can achieve the vacuum conditions required by the enterprise’s process application, reduce the possibility of equipment failure, and also reduce the operating cost.
  • Good stability: The screw vacuum pump has a simple structure, stable operation, and is not prone to failure. The vacuum performance is stable and not affected by the external temperature (as a backing pump, compared with the liquid ring pump, the liquid ring pump is easily affected by temperature in actual operation, and the backing liquid The vacuum performance of the ring vacuum pump is unstable. As a result, the Roots vacuum pump often operates at high load due to the excessive pressure difference between the outlet pressure and the inlet pressure. The rotor heats up severely, expands, and the gap becomes smaller. In addition, the inlet air of the main pump is not completely condensed. The pumped medium can easily condense and coke in the Roots vacuum pump, causing the vacuum pump to get stuck), thereby ensuring the stability of the chemical distillation process.
  • Energy-saving and environmental protection: the energy consumption of screw vacuum pump is low, the main process has no oil, water and other media involved, and it is a kind of dry vacuum pump, which will not pollute the environment, thus meeting the energy-saving and environmental protection requirements of the modern chemical industry.

Roots Vacuum Pumps

Advantages of Roots Pump in Vacuum Distillation

Roots vacuum pumps are highly regarded for their high efficiency and stability.

  • It has a high pumping speed and a low pumping time, which allows it to quickly and effectively reduce the system pressure during the distillation process.
  • The Roots vacuum pump has low noise and small vibration during operation, ensuring the quiet and stable operation of the distillation equipment.
  • Roots vacuum pumps have low maintenance costs and long service life, and can maintain stable performance during long-term operation, thus saving costs and maintenance time for users.
  • The Roots pump has a high ultimate vacuum and can maintain a large pumping speed at a high vacuum. For some distillation application conditions requiring high vacuum&large flow rate, the Roots pump is a very good booster vacuum pump. .
  • During the distillation process, it is often necessary to degas and dehydrate the treated materials, and Roots vacuum pumps can provide stable vacuum, making these operations more efficient. First of all, the Roots vacuum pump can quickly extract a large amount of gas in a short time and achieve instantaneous vacuum processing. In addition, Roots vacuum pumps can also withstand certain gas flux impacts and are suitable for processing various gas components, providing greater flexibility for distillation operations.

Application Of Vacuum Distillation Unit:


Solvent recovery
Freeze Drying

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In the vacuum state, the different boiling points of the components in the compound are separated through distillation methods. The vacuum pump further separates through its pressure changes. The vacuum equipment can remove non-condensable water and light solvents from the system, and can remove them from the reaction. Extract target compounds from the mixture. Because the boiling point will be lower under vacuum, vacuum distillation is the most ideal solution for handling high-boiling, heat-sensitive, and explosive compounds.


Solvent Recovery
Molecular Distillation
Pneumatic Conveying

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Separate two or more layers or parts with different temperatures, pressures, compositions and phases, and separate solvents from each other through different boiling and condensation stages. Based on the characteristic that the boiling point is relatively low under vacuum, it can gently process high-boiling, heat-sensitive or explosive compounds in a lower-temperature process environment, reducing side reactions and increasing the product recovery rate when there is a maximum temperature limit. Its application fields include: Molecular distillation in oleochemical industry;

  • Vacuum distillation in chemical distillation towers;
  • Vacuum distillation in the resin industry;
  • Vacuum distillation in the field of concentration and drying;
  • Vacuum distillation in the field of waste oil treatment;
  • Vacuum distillation in the chemical synthesis process;
  • Distillation in the production process of organic compounds, etc.

Petroleum cracking
Oil and gas recovery
Vapor Recovery
Vacuum degassing
VOC tail gas recovery

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Through normal pressure distillation or vacuum distillation, or double distillation (normal pressure + vacuum distillation), fuel oil can be processed into gasoline and other hydrocarbon fuels. Crude oil contains heavier and lighter hydrocarbons with different boiling points. Vacuum distillation can separate heavy hydrocarbons and extract lighter components such as gasoline. The entire process is energy-efficient and can reduce the production of useless by-products.

Principle Of Vacuum Distillation Unit

The vacuum distillation unit, its basic theory is to use the different boiling points of the components in the compound to separate. It is necessary to heat the mixture above the boiling point of one component in order to convert it into vapor form and then condense it back into liquid form. However, if the boiling point of the component is very high (generally considered to be above 150 degrees), achieving this can be challenging and costly. In such cases, reducing the pressure of the column can help decrease the boiling point of the compound. As pressure decreases, so does the boiling point, making it easier to achieve successful separation through distillation. This technique is commonly employed in various industries where efficient separation of components is crucial.

Distillation - Vacculex

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