Vacuum Distillation Unit

Refining crude oil relies on two distillation stages that work together. The atmospheric unit separates the light fractions first, and a vacuum distillation unit then processes the heavy residue that remains, recovering valuable material that would otherwise degrade under high temperature.

The Role of Atmospheric Distillation

The atmospheric distillation unit heats raw crude and separates it into gases, naphtha, kerosene, diesel, and gas oil at normal pressure. What is left behind, known as atmospheric residue, still contains heavy hydrocarbons that cannot be distilled further without risk of thermal cracking.

How the Vacuum Unit Extends Recovery

By operating under reduced pressure, the vacuum distillation unit lowers the boiling points of these heavy molecules. This allows them to be vaporised and separated at moderate temperatures, producing vacuum gas oil, lubricating-oil base stocks, and vacuum residue without destroying the feed.

Key Differences Between the Units

The two units differ primarily in operating pressure and temperature. Atmospheric distillation runs at roughly ambient pressure to separate lighter products, while the vacuum stage runs under deep vacuum to protect heavy feeds. The vacuum unit also demands specialised metallurgy and larger column diameters to handle corrosive residues.

Synergy That Eliminates Waste

Together, the two units ensure nearly every fraction of the crude is captured. Downstream, vacuum gas oil feeds crackers to produce more gasoline and diesel, and vacuum residue can be converted to bitumen, heavy fuel oil, or coker feed, maximising value from every barrel.

Learn More:

• Feasibility Studies for Waste-to-Value Projects
• Turn-Key EPC Delivery
• Plant Design & Engineering
• Facility Efficiency Upgrades
• Resource Recovery Projects

Capture Value From Every Fraction

Integrated distillation design recovers more product and leaves less waste across the boiling range.

Klean Industries engineers atmospheric and vacuum distillation systems built for yield and reliability.

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