The process adopted to produce oxygen and nitrogen is called liquification and fractional distillation of air inside the air separation unit.
Air is expanded and liquefied in this process by expansion and cooling in an expansion engine and expansion valves in medium pressure. (40 kgs/cm2 to 50 kgs/cm2.). The expanded and cooled air from expansion engine and expansion valves will enter the lower part of the distillation column. The air as mostly in liquid state. The oxygen and nitrogen have different boiling points. Since nitrogen is more volatile is drawn out of the distillation column in vapour form and oxygen is less volatile will be collected in condenser. The liquid oxygen pumped at 150kgs/cm2 and filled in cylinders.
Nitrogen (N2) constitutes 78.03% of the air. Nitrogen is used in the chemical and petroleum industries for storage tank blanketing and as innert gas applications. It is also used extensively by the electronics, automobiles, iron & steel industries.
Liquid nitrogen, produced by the cryogenic air separation process, finds wide use as a refrigerant in applications such as cryogenic storage, preservation in hospital and food processing industries. We supply variety of nitrogen gas plants & liquid nitrogen plants.
This acetylene plant from oxyplants is of an advanced design, incorporating several features not ordinarily found in other generators. This one is a fully automatic plant with twin hoppers (and needs an operators’ attention for only ten minutes in an hour).
‘Oxyplant’ acetylene generator is a stationary carbide to water automatic generator. Acetylene is generated as a result of the chemical reaction between calcium – carbide and water. The by-product is calcium-hydroxide (lime slurry) which is continuously discharged from the generator. The acetylene produced in the generator is at 0.5 kgs/cm2 and passed through coolers, driers, purifiers to achieve purity and compressed in a three stage water cooled compressor. The compressed acetylene gas is filled into the cylinder in the filling manifold at 15 bars and cooled by water spraying to achieve better absorption of gas in the acetone of the cylinder.
The gas produced is highly flammable and explosive, if mixed with air. Therefore various safety devices and automatic systems are incorporated to avert fire and/or explosion. These systems make the acetylene plant is highly sophisticated and safe equipment.
An air separation plant separates atmospheric air into its primary components, typically nitrogen and oxygen sometimes also argon and rarely other inert gases. There are various technologies that are used for the separation process; the most common is via cryogenic distillation.
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