Tip 1: How to make dry ice

carbon dioxide in a solid state known as dry ice.One of its properties of interest - that it sublimes from the solid phase into the gaseous phase, bypassing the liquid.It is mainly used to cool food during transport, storage of ice cream in hot weather, etc.In industry, it is obtained by cooling of carbon dioxide at elevated pressure, in the domestic environment to receive dry ice in a similar manner is problematic, becausenecessary equipment.Nevertheless, there are options.
you need
  • carbon dioxide fire extinguisher, a bag made of thick fabric, carbon dioxide tank, wire, tape.
Guide
1
Take fire extinguisher, use only carbon dioxide.Its output socket, put a - a bag made of thick fabric and securely strap the wire or tape can, as long as he did not flew with the release of a jet from a fire extinguisher.
2
Further, citing a fire extinguisher into action, firing three or four jets of carbon dioxide in the bag.Carbon dioxide in the fire extinguisher is under high pressure, and when it
comes out of it, then expands rapidly cooling the surrounding space, as a result, freezing of the gas remains inside a bag in the form of dry ice.
3
You can try to get dry ice instead of using carbon dioxide fire extinguisher cylinder, used for semi-automatic welding.In the same way a bag strapped tight to the outlet fitting of the cylinder, and brief but sharp turns valve bleed a little gas in the bag.

Tip 2: How to get dry ice

called dry ice solid carbon dioxide.Its main distinguishing feature is that it can instantly turn into gas, bypassing the liquid state of aggregation.Dry carbon dioxide is used, for example, in portable refrigerators - those that sell ice cream.Preparation of dry ice in an industrial environment takes place in three stages.
How to get dry ice
you need
  • - baking soda;
  • - laboratory glassware;
  • - siphon cartridges;
  • - extinguisher;
  • - safety glasses;
  • - gloves;
  • - tight package.
Guide
1
small amount of dry ice can be accessed using several chemical experiments.Get carbon dioxide.Take crystal soda.You can use plain drinking.Pour it into a flask.Pour in to the same solution of dilute hydrochloric or acetic acid.Close the flask with a rubber stopper with a tube.Take the tube into the water.Collect the bubbles rising in the tube.This is carbon dioxide.In industrial applications for carbon dioxide, it is now most commonly used monoethanolamine.
2
Liquid carbon dioxide - carbon dioxide is dissolved in water.It is known to many as the soda without the syrup.This compound is extremely unstable.At room temperature liquid carbon dioxide, rapidly decomposed into water and carbon dioxide that is released as bubbles.You can observe it by taking regular household siphon and charge him a gas canister.She poured him a glass of soda, you will be able to observe the decomposition of carbon dioxide.Industrial production of liquid carbon dioxide dry ice is transported in special containers, where it is under a lot of pressure.
3
For dry ice is used, the liquid carbon dioxide under pressure.In the context of the school laboratory to receive this kind of pressure is not possible, so take a ready-made stuff.Is it, for example, carbon dioxide fire extinguisher types OU.Wear safety glasses and heavy gloves.Remove the seal and remove the safety pin.Take a tight bag and put it on the bell extinguisher.Press release lever and slightly pressurized carbon dioxide.She should get the sack.
4
Release the handle.Remove the bag and turn out.In it you will see a number of dry white substance resembling ice .This is dry ice .The compressed carbon dioxide during expansion absorbs a lot of heat.At the same time she is quenched.In industrial environments produce a dry granular ice or packed in blocks.For this purpose there is a special installation - palletizer and block makers.
5
In the industrial production of the carbon dioxide dry ice turns back into gas.The rest goes into the solid state.Its force is compacted and cooled.First forms a fairly loose substance, which is also called « dry snow."It is a kind of semi-finished product.His driven to the plant and compressed, resulting in turns dry ice .
Note
Before you conduct an experiment with a fire extinguisher, make sure that he does carbon dioxide.It it must be labeled accordingly.The contents of other fire extinguishers may be far from safe.

Do not attempt to extract carbon dioxide from the gas-cylinder pistol for cartridges.The desired material is there only to open a cartridge is extremely dangerous.
Helpful Hint
carbon dioxide fire extinguisher is best to buy.This can be done through the online store.This will give you the opportunity to receive regular dry ice - for example, for making homemade ice cream.In many parts of the fire extinguishers are filled in.
Sources:
  • The technology of dry ice in an industrial environment
Note
Upon receipt of dry ice, especially with the use of fire extinguisher use gloves and other protective equipment, generally avoid contactjet on the exposed parts of the body.The temperature of the jet passes for minus 70 degrees, you can get burned.
Sources:
  • how to get dry ice

0
0