Cyclohexane Production Unit
The Cyclohexane Production Unit is an important facility within petrochemical and refinery-integrated complexes, producing high-purity cyclohexane primarily for downstream caprolactam, adipic acid, and nylon production.
The primary objective of a cyclohexane production unit is to hydrogenate benzene into cyclohexane with high selectivity, safe operation, and optimized production economics.
Commercial cyclohexane plants are designed for continuous operation with high reliability and are often integrated with aromatic extraction units and downstream nylon intermediates.
The Cyclohexane Production Unit is an important facility within petrochemical and refinery-integrated complexes, producing high-purity cyclohexane primarily for downstream caprolactam, adipic acid, and nylon production. The primary objective of a cyclohexane production unit is to hydrogenate benzene into cyclohexane with high selectivity, safe operation, and optimized production economics.
Commercial cyclohexane plants are designed for continuous operation with high reliability and are often integrated with aromatic extraction units and downstream nylon intermediates. Proven licensed technologies, robust catalyst systems, and high-quality equipment are essential to achieve long operating cycles and consistent product quality.
Production Process Overview
Cyclohexane is commercially produced through the catalytic hydrogenation of benzene in the presence of hydrogen.
The reaction is carried out in fixed-bed reactors under controlled temperature and pressure to ensure high conversion and selectivity.
This route is globally adopted due to its operational simplicity, scalability, and strong economic performance.
Benzene Hydrogenation Route
Cyclohexane is commercially produced through the catalytic hydrogenation of benzene in the presence of hydrogen. The reaction is carried out in fixed-bed reactors under controlled temperature and pressure to ensure high conversion and selectivity.
Key commercial features:
- High benzene conversion with minimal by-products
- Continuous operation with integrated hydrogen recycle
- Excellent product purity suitable for nylon intermediates
- Proven and widely licensed industrial process
This route is globally adopted due to its operational simplicity, scalability, and strong economic performance.
Licensed Technologies and Process Providers
UOP (Honeywell)
Axens
KBR
Cyclohexane production units are based on established and licensed technologies supplied by globally recognized licensors.
Major technology providers include:
- UOP (Honeywell)
- Axens
- Lummus Technology
- Sinopec Engineering
- KBR
These licensors provide complete process packages including reactor design, catalyst selection, heat integration, and operating guidelines.
Catalysts
Nickel-based hydrogenation catalysts
Noble metal catalysts for high-purity applications
conversion efficiency, selectivity, and unit cycle length
Catalysts are a critical component of cyclohexane production units, directly affecting conversion efficiency, selectivity, and unit cycle length.
Common catalyst systems:
- Nickel-based hydrogenation catalysts
- Noble metal catalysts for high-purity applications
Leading global catalyst suppliers:
- BASF
- Clariant
- Albemarle
- Johnson Matthey
- Axens
OGSCM Group supports cyclohexane producers by sourcing and supplying licensor-approved catalysts with full technical documentation and reliable logistics.
Chemicals
Benzene – primary aromatic feedstock
Hydrogen (H₂) – hydrogenation reactant
Nitrogen (N₂) – inerting and purging
Feedstock and Process Chemicals
Stable supply of high-quality feedstock and auxiliary chemicals is essential for uninterrupted cyclohexane production.
Key chemicals include:
- Benzene – primary aromatic feedstock
- Hydrogen (H₂) – hydrogenation reactant
- Nitrogen (N₂) – inerting and purging
- Process Water / Demineralized Water – cooling and washing
Standard Industrial Packaging and Supply Modes:
- Bulk pipeline or tank storage (benzene, hydrogen)
- ISO tanks and road tankers
- IBC containers (1,000 L)
- Steel drums (200–220 L)
OGSCM Group supplies cyclohexane process chemicals in approved industrial packaging formats, ensuring safety, regulatory compliance, and consistent quality.
Major Global Chemical Brands
Chemicals and auxiliaries used in cyclohexane production units are typically sourced from internationally recognized manufacturers.
Key global brands include:
- BASF
- SABIC
- INEOS
- Shell Chemicals
- ExxonMobil Chemical
- Sinopec
OGSCM Group collaborates with approved global suppliers to deliver competitive commercial terms and full technical documentation.
Main Equipment
Cyclohexane production units include hydrogenation reactors, separators, recycle gas systems, and distillation columns.
Heat exchangers are used for feed preheating, reaction heat removal, and product cooling.
Accurate instrumentation ensures safe and stable operation of cyclohexane production units.
Reactors and Process Vessels
Cyclohexane production units include hydrogenation reactors, separators, recycle gas systems, and distillation columns.
Well-known manufacturers and suppliers:
- L&T Heavy Engineering
- Doosan Enerbility
- Mitsubishi Heavy Industries (MHI)
- Technip-approved fabricators
- Sinopec-approved manufacturers
OGSCM provides sourcing and supply solutions for cyclohexane reactors, separation vessels, distillation columns, and associated internals and mechanical components.
Heat Exchangers
Heat exchangers are used for feed preheating, reaction heat removal, and product cooling.
Leading suppliers include:
- Alfa Laval
- Kelvion
- API Heat Transfer
- Hisaka
- Tranter
OGSCM Group supplies heat exchangers and critical spare parts suitable for benzene and cyclohexane service.
Instrumentation
Accurate instrumentation ensures safe and stable operation of cyclohexane production units.
Major brands:
- Emerson
- Yokogawa
- Honeywell
- Endress+Hauser
- ABB
| Tag | Full Name | Function |
|---|---|---|
| PT | Pressure Transmitter | Reactor pressure monitoring |
| TT | Temperature Transmitter | Reaction temperature control |
| FT | Flow Transmitter | Benzene and hydrogen flow control |
| LT | Level Transmitter | Separator and column level control |
| AT | Analyzer Transmitter | Product purity monitoring |
Valves
Valves used in cyclohexane units must be suitable for hydrogen and aromatic hydrocarbon service.
Major manufacturers:
- Emerson (Fisher, Vanessa)
- Cameron (SLB)
- Flowserve
- L&T Valves
- Kitz
- Neway
OGSCM Group offers comprehensive procurement solutions for control, isolation, and safety valves required in cyclohexane production units.