Liquid nitrogen is the most effective way to cool down a chemical reaction, to temperatures below –100°C/–148°F for faster reactions with complete temperature control.
Air Products' fully engineered systems provide an economical solution for direct, semi-direct or indirect cooling methods. The power of liquid nitrogen as a refrigerant, coupled with uniformity of the exchange fluid, ensures perfect chemical reaction temperature control. For indirect cooling systems, the gaseous nitrogen may be re-used in other plant processes to improve overall process economics. | 
Versatile
No matter what the reaction or exotherm level, the reaction temperature is totally controlled by maintaining, increasing or decreasing the flow of liquid nitrogen.
Stable temperatures below –40°C/–40°F can therefore be easily achieved. The temperature of the heat transfer fluid is flexible.
Economic
Installation costs are a fraction of mechanical systems. Liquid nitrogen is delivered direct to your site and can be re-used as part of your plant utility. The liquid nitrogen usage depends entirely on the refrigeration load.
Low Maintenance
With few moving parts and simple temperature controllers, the systems are reliable and easy to maintain.
Indirect cooling is achieved by cooling a circulated heat transfer fluid within a Liquid Nitrogen cooled exchanger.
Air Products offer a range of engineered solutions for carrying out low temperature and chemical synthesis. Other methods of direct and semi-direct cooling are also available.
Air Products can offer a full technical service as well as the following technology:
- A compact heat exchanger
- A unique control system, specially designed for reaction cooling systems for absolute temperature control
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