Lumbini Group

     Oxygen gas
 Application(Cylinder:47 liters)
 Medical Application(Cylender: 47 Liters and 10 liters)

 Metals manufacturing uses for oxygen
  The largest user of oxygen is the steel industry. Modern steelmaking relies heavly on the use of
  oxygen to enrich air and increase combution temperatures in blast furnaces and open hearth furnaces
  as well as to replace coke with other combustible materials. During the steel making process, unwanted
  carbon combines with oxygen  to form  carbon oxides,  which  leave  as  gases.  Oxygen is fed into the
  steel bath through a special lance. Oxygen is used to  allow greater use of  scrap metal in electric arc
  furnaces.  Large quantities of oxygen are also used to make other metals, such as copper, lead, and
  zinc. Oxygen enrichment of comustion air, or oxygen injection through  lances, is used to an increasing
  extent in cupola fumaces, open-hearth fumaces, smelters for glass and mineral wool, and lime and
  coment kilns, to enhance their capacity and reduce energy requirments. Smelting times and energy
  consumption can also be reduced by special oxy-oil or oxy-gas burnaers in electro-steel furnaces and
  induction smelters for aluminum. A high thermal efficiency is achived by these "Oxyfuel" burners,
  which mix fuel and oxygen at the tip of the burner. As a result, rapid combustion occurs at approxi-
  -mately 2800'C(5072'F).

   Chemicals, pharmaceuticals and petroleum uses
    * Oxygen is used as a raw material in many oxidaion process, including the manufacture of ethylene  
        oxide, propylene oxide, synthesis gas using partial oxidation of a wide range of hydrocarbons,
        ethylene dichloride, hydrogen peroxide, nitric acid, vinyl chloride and phthalic acid.
    *  Very large quantities of oxygen are used in coal gasification to generate a synthesis gas that can be
        used as a chemical feedstock or precursor for more easily-transported and easily-used fules.
    *  Oxygen is used to enrich the air feed to catalytic cracking regenerators, which increases capacity
        of the units.it is used in sulfur recovery untis to achieve similar benefits.
    *  Oxygen is also used to regenerate catalysts in refineries.
    *  Oxygen is used to achieve more complete combustion and destructionh of hazardous and waste
        materieals in incinerators.

   Pulp and paper manufacturing uses
    Oxygen is increasingly important as a bleaching chemical.In the manufacture of high-quality bleached
    pulp,the lignin in the pulp must beremoved in a bleaching  process.Chlorine has been used for this
    purpose but new processes using oxygen reduce water pollution.Oxygen plus caustic soda can replace
    hypochlorite and chlorien dioxide in the bleaching process,resulting in lower costs.
    In a chemical pulp mill,oxygen added to the combustion air increases the production capacity of the
    soda recovery boiler and the lime-reburning kiln. The use of oxygen in black liquor oxidation reduces
    the discharge of sulfur pollutants into the atmosphere.
 
   Health care uses
    * In medicine,oxygen is used during surgery,intensive care treatment,inhalation therapy,etc.High
       statndars of purity and handling must be maintained.
    * Oxygen is typically supplied to hospitals though bulk liquid delivereies,then distributed to usage
        points.It assists with respiratory problems, saving lives and increasing patient comfort.
    * Small portable air separation units are gaining wide use in homes. Compact non-cryogenic units,
       typically producing 93% purity medical grade oxygen, are being utilized in small and/orremote
       hospitals where demand is high enough to make cylinder deliveries a logistical problem but  where
       liquid deliveries are unavailable or very costly.

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     Nitrogen gas
            Food packing & Industrial Application(Cylinder:47 liters)

   Metals manufacturing uses for nitrogen
    Nitrogen is used to treat the melt in the manufacture of steel and other metals and as a shield gas in
    the heat treatment of iron, steel and other metals. It is also used as a process gas, together with other
    gases for reduction of carbonization and nitriding.
    "Flash" or "fins" on cast metal can be removed by cooling with liquid nitrogen, making them brittle,
    allowing then to be broken off by mechanical action.

   Chemicals, pharmaceuticals and petroleum uses
     Refineries, petrochemical plants and marine tankers use nitrogen to pureg equipment, tanks and
     pipelines of dangerous vapors and gases (for example, after completing a pipline transfor operation
     or ending a production run) and to maintain an inert and protective atmosphere in tanks storing
     flammable  liquids.  Cold  nitrogen gas  is used to cool reactors  filled  with catalyst during
     maintenance work.  The cooling time can be reduced substantially.
     Cooling reactors (and the materials inside) to low temperature allows better control of side-reactions
     in complex reactions in the pharmaceutical industry. Liquid nitrogen is often used to provede the
     nessary refrigeration as it can produce rapid temperature reduction and easily maintain the required
     cold reaction temperatures. Reactore cooling and temperature control system usually rmploy a
     circulating heat transfer fluid.

   Rubber and plastics industry uses
    Materials become hard and brittle when cooled by to very low temperatures. This property permits
    the removal of "flash" or "fins" on  cast plastics and rubber. The castings are cooled by liquid
    nitrogen and the flash broken off by mechanical action.

   Food and beverages
    The intense cold in liquid nitrogen allows very rapid freezing of food items, resulting in minimal cell
    damage from ice crystals and improved appearance, taste and texture. Well-designed cryogenic
    tunnel and spiral freezers efficiently capture refrigeration from  liquid  vaporization and from cold
    nitrogen gas it flows through the freezer.
    When substances such as vegetable oil and wines are stored, the inert properties of nitrogen can be
    used to protect against loss of quality by oxidation by expelling any air entrained in the liquid
    ("sparging") and protecting liquids in storage tanks by filling the vapor space("blaneting").
    Nitrogen (and nitrogen mixed with CO2 and oxygen) is used in transport trucks in Modified
    Atmosphere Packaging(MAP) to exted the shelf life of packaged foods by preventing oxidation,
    mold, insect infestation and moisture migration.