Using nitrogen for burial
Nitrogen is a natural part of the air we breathe. A little more than 78% of the air is nitrogen.
Nitrogen is a by-product from the essential medical oxygen industry and initially this is the source of the nitrogen used in the Promession process. Unused nitrogen is released back into the atmosphere unchanged and is therefore reusable and recyclable.
Nitrogen gas in liquid form has a temperature of minus 196 degrees Celsius. It is colourless and odourless and spills vaporize rapidly without causing any environmental problems.
Air separation and distillation are applied in the production of liquid nitrogen. The air used is purified, devoid of water and particles, then it is cooled and compressed until it becomes liquid and is fed into a distillation column where the various gases are boiled off at different levels. The nitrogen gas is thus separated and fed into a heat exchanger, turned back into liquid form and finally stored in well-insulated tanks.
Super cooling technologies or Cryogenics have been in use for more than a century and have become far more energy efficient. Producing liquid nitrogen is still relatively costly, however this is offset by other factors when it is used to replace environmentally hazardous alternatives, such as fossil fuels. Nitrogen is a by-product of the essential oxygen industry and therefore Promession recycles this waste product.
