Separation Processes in Oil Refineries
Physically divide complex hydrocarbon mixtures into individual fractions based on differences in boiling point, density, solubility, and molecular weight.
Improve product quality, maximize recovery, reduce energy consumption, and ensure safe and reliable operation of downstream processing units.
Atmospheric distillation, vacuum distillation, phase separation, absorption and stripping, and filtration and coalescing.
Separation processes are fundamental operations in oil refineries, forming the backbone of crude oil processing and product recovery. The primary objective of separation processes is to physically divide complex hydrocarbon mixtures into individual fractions based on differences in boiling point, density, solubility, and molecular weight. These processes enable refineries to produce specification-compliant intermediate streams for further conversion, treating, and blending operations. By applying efficient separation techniques, refineries improve product quality, maximize recovery, reduce energy consumption, and ensure safe and reliable operation of downstream processing units. Separation processes are widely used at every stage of refinery operation, from crude oil intake to final product finishing.
Major Separation Processes
Atmospheric Distillation
Atmospheric distillation is the first major separation step in crude oil refining. Crude oil is heated and introduced into a fractionation column where it is separated into products such as LPG, naphtha, kerosene, diesel, and atmospheric residue.
Key features:
- Operates at near-atmospheric pressure
- Separates crude oil into boiling-range fractions
- Supplies feedstock for downstream units
Vacuum Distillation
Vacuum distillation processes atmospheric residue under reduced pressure to recover valuable heavy fractions without thermal cracking.
Main products:
- Light Vacuum Gas Oil (LVGO)
- Heavy Vacuum Gas Oil (HVGO)
- Vacuum residue
Vacuum distillation enables refineries to maximize recovery of heavy feedstocks for conversion units such as FCC and hydrocrackers.
Phase Separation
Phase separation is used to separate gas, liquid hydrocarbons, and water in refinery streams. This process is applied in separators, drums, and knockout vessels.
Applications include:
- Crude oil dehydration
- Gas-liquid separation
- Condensate recovery
Absorption and Stripping
Absorption and stripping processes are used to selectively remove light hydrocarbons or impurities from gas and liquid streams using physical or chemical solvents.
Common applications:
- LPG recovery
- Gas treating and recovery
- Light ends removal
Filtration and Coalescing
Filtration and coalescing systems remove solids, free water, and fine droplets from hydrocarbon streams.
Key benefits:
- Protects downstream equipment
- Improves product clarity
- Enhances operational reliability
Chemicals
Break water-oil emulsions and improve separation efficiency.
Control foam formation in refinery columns and separators.
Protect refinery equipment and piping systems.
Separation Process Chemicals
Various chemicals are used to enhance separation efficiency and protect refinery equipment.
Common chemicals include:
- Demulsifiers – break water-oil emulsions
- Anti-foaming agents – control foam formation in columns
- Corrosion inhibitors – protect equipment and piping
- Water treatment chemicals – manage separated wastewater
Globally recognized suppliers of separation process chemicals include:
- BASF
- Dow
- Clariant
- Nalco Water (Ecolab)
- Innospec
- LANXESS
- Arkema
OGSCM works with approved manufacturers to ensure consistent quality and reliable supply. OGSCM group can supply chemicals with Standard Industrial Packaging at Bulk supply (tanker or ISO tank), IBC containers (1,000 L), Steel drums (200–220 L). OGSCM Group supplies refinery-approved separation chemicals in standard industrial packing formats with full technical support and documentation.
Main Equipment
Critical refinery equipment used for hydrocarbon fraction separation.
Used for feed preheating, product cooling, and energy recovery.
Support process control, safety, flow management, and operational reliability.
Distillation Columns and Separation Vessels
Distillation columns, separators, and drums are critical for effective refinery separation processes.
Well-known manufacturers and suppliers:
- UOP (Honeywell)
- Axens
- L&T Heavy Engineering
- Doosan Enerbility
- Mitsubishi Heavy Industries (MHI)
OGSCM provides sourcing solutions for columns, internals, trays, structured packing, demisters, and associated mechanical components.
Heat Exchangers
Heat exchangers are used extensively for feed preheating, product cooling, and energy recovery.
Leading commercial suppliers:
- Alfa Laval
- API Heat Transfer
- Kelvion
- Hisaka
- Tranter
OGSCM Group supplies heat exchangers and essential spare parts for refinery separation units.
Instrumentation
Instrumentation ensures precise control of pressure, temperature, flow, and level throughout separation units.
Major brands include:
- Emerson
- Yokogawa
- Honeywell
- Endress+Hauser
- ABB
| Tag | Full Name | Function |
|---|---|---|
| PT | Pressure Transmitter | Pressure monitoring |
| TT | Temperature Transmitter | Temperature measurement |
| LT | Level Transmitter | Liquid level control |
| FT | Flow Transmitter | Flow measurement |
Valves
Valves are essential for process control, isolation, and safety across all separation processes.
Major manufacturers:
- Emerson (Fisher, Vanessa)
- Cameron (SLB)
- Flowserve
- L&T Valves
- Neway
- Kitz
OGSCM Group offers comprehensive procurement solutions for industrial valves, including control, isolation, and safety valves with full documentation.
Submit Your RFQ
Contact OGSCM for refinery separation chemicals, heat exchangers, instrumentation, industrial valves, separation vessels, and refinery process equipment required for separation processes in oil refineries.
