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Liquid nitrogen

Liquid nitrogen

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Ukraine, Kryzhanovka
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  • BrandТОВ ЦРТ
  • Country of manufactureUkraine
Liquid nitrogen Liquid nitrogen — liquid of transparent color. Is one of four aggregate states of nitrogen. Liquid nitrogen possesses with a specific density of 0,808 kg/dm ³ and has a boiling point 77,4 K (−195,75 °C). It is not explosive and is not poisonous. In a free look — gas without color, a smell and taste, we will badly dissolve in water. Consists of the diatomic molecules N2 having high durability. Treats nonmetals. Receiving: in the industry nitrogen is received from air. For this purpose air is cooled at first, liquefied, and liquid air is subjected to distillation (distillation). Temperature of boiling of nitrogen is a little lower (–195,8 °C), than other component of air — oxygen (–182,9 °C) therefore at careful heating of liquid air nitrogen evaporates the first. To consumers gaseous nitrogen is delivered in summary form (150 atm. or 15 MPas) in the black cylinders having the yellow inscription "nitrogen". The laboratory receives pure ("chemical") nitrogen adding when heating saturated solution of chloride of NH4Cl ammonium to solid nitrite of NaNO2 sodium. Application In the equipment and on production: it is used for cryogenic cutting; at deep freezing of various materials, including organic; for cooling of various machinery and equipment; in an overkloking, for cooling of components of the computer at extreme dispersal; in the industry gas nitrogen is used mainly for receiving ammonia; As chemically inert gas nitrogen is applied to providing the inert environment in various chemical and metallurgical processes, when pumping combustible liquids. In the food industry: liquid nitrogen is used as the cooling and freezing agent; it is applied also as propellants, for example in whipped cream in barrels; nitrogen is registered as E-941 nutritional supplement as the gas environment for packing and storage, coolant, and liquid nitrogen is applied at a spill of oils and not carbonated drinks to creation of excessive pressure and the inert environment in a soft container. In medicine: for storage of cages, bodies and fabrics by means of a cryopreservation; for the cosmetic cryobathtub procedure (influence by cold on skin); for cryodestruction (destruction of affected areas of fabrics and bodies), for example, for removal of warts. In fire extinguishing: the principle of fire extinguishing with liquid nitrogen is that evaporating, nitrogen cools the center of ignition and forces out the oxygen necessary for burning therefore the fire stops; as nitrogen, unlike water, foam or powder, just evaporates and disappears, nitric fire extinguishing, along with carbon dioxide — the most effective from the point of view of safety of values a way of suppression of the fires. Storage Litre of liquid nitrogen, evaporating and heating up to 20 °C, forms about 700 liters of gas. For this reason liquid nitrogen is stored in special vessels of the Dewar with vacuum isolation of open type, cryocylinders or cryogenic capacities under pressure. Safety measures during the work with liquid nitrogen: Short-term contact of skin with liquid nitrogen is not dangerous as at the same time on skin the airbag with low heat conductivity which protects skin from direct contact with liquid nitrogen is formed. The long contact of the liquid nitrogen or material cooled with liquid nitrogen with skin or eyes can cause serious damages. At hit of liquid nitrogen on skin the affected area should be washed immediately plentifully water. At evaporation of liquid nitrogen, the evaporating gas has very low temperature and density big than at air. Therefore it can collect at the lower level of the room and is imperceptible create the increased concentration indoors. At the same time concentration of oxygen in air decreases — there is a violation of a rhythm of breath, increase of pulse, then — consciousness violation, decrease in a chuvstvii-telnost, ability to move is lost, there is nausea and vomiting, consciousness is disconnected, and in a few minutes there comes death. Special danger is that it occurs without serious consequences and the person does not realize the state. Free shipping across Odessa and an obla
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