Dry Ice ( Compressed Carbon
Information, Process, Patent, Application, Functions, Companies in the field, Reports
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- Dry Ice," the trademark name for
solid carbon dioxide, reaches its solid state when cooled liquid
carbon dioxide is put under pressure.
- Dry ice, sometimes referred to as
"Cardice" or as "card ice", is the solid form of carbon dioxide. It
is used primarily as a cooling agent.
- Dry ice advantages include lower
temperature than that of water ice and not leaving any residue
(other than incidental frost from moisture in the atmosphere). It is
useful for preserving frozen foods, ice cream, etc.,
- Dry ice is the solid form of
carbon dioxide (chemical formula CO2), comprising two oxygen atoms
bonded to a single carbon atom. It is colorless, odorless,
non-flammable, and slightly acidic.
- Dry ice is solidified carbon
dioxide (CO2). Distinct from regular ice, which exists at
temperatures of 32°F (0°C) and below, dry ice is extremely cold,
- The density of dry ice varies,
but usually ranges between about 1.4 and 1.6 g/cm3 (87–100 lb/ft3).
- It may also be used to generate
carbon dioxide gas to displace oxygen-bearing atmosphere and to
carbonate liquids (especially in a party punch due to the bubbles
and moisture vapors that form a visual interest).
- Dry ice is easily manufactured.
- First, gases with a high
concentration of carbon dioxide are produced. Such gases can be
a byproduct of another process, such as producing ammonia
from nitrogen and natural gas, or large-scale fermentation.
- Second, the carbon
dioxide-rich gas is pressurized and refrigerated until it
liquifies. Next, the pressure is reduced. When this occurs some
liquid carbon dioxide vaporizes, causing a rapid lowering of
temperature of the remaining liquid.
- As a result, the extreme cold
causes the liquid to solidify into a snow-like consistency.
Finally, the snow-like solid carbon dioxide is compressed into
either small pellets or larger blocks of dry ice.
- Dry ice is typically produced
in two standard forms: blocks and cylindrical pellets. A
standard block weighing approximately 30 kg is most common.
Pellets are around 1 cm (0.4 in) in diameter and can be bagged
easily. This form is suited to small scale use, for example at
grocery stores and laboratories.
- One of the largest mechanical
uses of dry ice is blast cleaning. Dry ice pellets are shot out
of a nozzle with compressed air. This can remove residues from
- Dry ice can be used to arrest
and prevent insect activity in closed containers of grains and
grain products, as it displaces oxygen, but does not alter the
taste or quality of such foods. For the same reason, it can
prevent or retard food oils and fats from becoming rancid.
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