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Cooling and heating control unit for chemical reactors ALASKA

ALASKA LN2 for freeze-drying

Freeze-drying cycle optimization using cryogenic cooling and ALASKA range heat exchangers

ALASKA LN2 for freeze-drying: an alternative to using conventional coolants (CFC, HCFC) which contribute to the destruction of the ozone layer. Liquid nitrogen has a higher cooling capacity and makes it possible to improve freeze dryer performance, by reducing cycle times.

Operating principle

ALASKA LN2 for freeze-drying is the Air Liquide solution for providing the cooling capacity required by a freeze dryer. 
Operating principle: 
Liquid nitrogen is stored in liquid form at a temperature of -196°C. 
It is injected 

  • into the ALASKA exchanger to cool a silicone oil to the desired freezing temperature, typically – 40°C. 
  • into the winding to trap water vapor in the form of ice. The trap temperature can vary between -60°C and -80°C. 

The gaseous nitrogen is returned to the atmosphere via a vent 

A simple and reliable system
5 components forming the system: 

  • The LN2 tank 
  • The vacuum-insulated LN2 transfer line 
  • The ALASKA exchanger 
  • The trap windings 
  • The temperature regulation system and the LN2 operating tools supplied with the ALASKA exchanger

An economical solution: 

  • System reliability due to absence of rotating machines 
  • Maintenance and operating costs 
  • Freeze-dried product quality 
  • Productivity gain due to cycle time reduction 

ALASKA LN2 is a suitable and economical solution, compared to conventional mechanical cooling systems

Range

An exchanger range from 5 to 100 kW with the possibility to manufacture higher-capacity equipment if required.

Exchanger

CF 5

CF 12,5

CF 25

CF 37,5

CF 50

CF 75

CF 100

Nominal cooling power (kW)

5

12,5

25

37,5

50

75

100

Key benefits

COMPARISON WITH MECHANICAL COOLING UNITS: ALASKA LN2 offers the following advantages: 

  • Lower maintenance and no specific expertise required, 
  • Compact size, no noise pollution 
  • Suppression of use of gases that destroy the ozone layer 
  • No regulatory constraints 

PROCESS 

  • Easy operation due to the flexibility of the system 
  • Greater reliability and reproducibility of freeze-drying cycles 
  • Greater cooling capacity than conventional systems, which is constant throughout the temperature range and instantaneously available. 
  • Cycle time reduction 
  • Possibility to reach very low temperatures for specific recipes 


LOW OPERATING COST - No electricity 

  • No backup generator 
  • No cooling water 
  • Lower maintenance costs 
  • Lower number of shutdowns due to failure.

Main technical characteristics

  • Specific liquid nitrogen exchangers 
  • Large heat exchange surface area 
  • Insulation making it possible to limit heat losses 
  • LN2 consumption optimization 
  • Sturdy stainless steel design 
  • "Ready-to-start" skid assembly

Standards

CE, ASME