It is made by pressurizing carbon dioxide which further turns into a liquid when cooled down. Then, the liquid is injected into a holding tank/press/pelletizer, kept at a temperature of -109°F, and then converted into carbon dioxide gas and dry ice snow.
What Is Dry Ice?
Dry ice is carbon dioxide in a solid state that doesn’t melt into a liquid when exposed to heat but into its gaseous form (in a process called sublimination). This type of ice is way cooler than regular ice and can’t be made and kept in a regular freezer because it would quickly turn into gas. It is kept in heavily insulated tanks that slow down the sublimation rate and keep the ice solid for longer.
History of Dry Ice
Dry ice was first used by a French inventor, Adrien Jean Pierre Thilorier, in 1835, but it wasn’t until 1925 that it became commercially available. Thomas Slate was the person who applied for the patent and established Dry Ice Corporation and the brand “Dry Ice” in the United States. Dry ice was initially found in commercial settings and was used only for refrigeration.
Types of Dry Ice
Dry ice comes in four forms: block, pellet, sliced, and diced, each suitable for a different application/need.
1. Dry Ice Pellets
The most common use of dry ice pellets is for small-scale storage, delivery, conducting experiments, creating fogs and mists, as well as in the food and beverage industries. The cylindrical dry ice is available in six diameters (6, 9, 10, and 16mm) and is packaged in 10kg packages.
2. Dry Ice Slices
Because dry ice slices are so long-lasting, they are used for airlines to store food and for pharmaceutical companies to store medical supplies. Each slice is wrapped in a separate foil-wrap to prolong sublimation. The product is available in packs of 1 to 10kg.
3. Dry Ice Blocks
A block of dry ice (also available in bricks and slabs) has a longer shelf life and can be used for industrial applications, long-distance shipping, freeze branding, and making smoke effects. It is available in packages of ten kilograms.
4. Drice (3mm Pellets)
Dry ice in 10kg units, 3-mm cylindrical, meant for blasting ice, and not for domestic use.
Uses Of Dry Ice
The main purpose of dry ice is to refrigerate, cool, process, and distribute food. However, it can also be used in the entertainment industry (for theatrical and special effects), pest control, the medical industry (hospitals and clinics), as a cleaning solution, or as a mosquito repellant.
1. Food Industry
Aside from preventing food from spoiling or causing allergic reactions and foodborne diseases, dry ice is used for food storage (supermarkets and restaurants use it to store ingredients in food display containers) and transportation, since it keeps food fresh, flavorful, and crisp for a long time.
2. Beverage Industry
It is used to create illusional, smokey effects in beverages. The carbon dioxide mists make it possible to present drinks in impressive ways. Usually, dry ice is used for rum, gin, vodka, and tequila.
3. Entertainment Industry
Dry ice can be used to create dramatic and special effects such as vapor-like fog, artificial rain, bubbles, and the dispersal of clouds.
4. Healthcare/Medical Industry
Dry ice is used for storing biological and test samples, transporting organs, and for minor surgeries (instead of liquid nitrogen) because it leaves no residue and evaporates, which limits bacteria growth.
5. Dry Ice Blasting
It is an effective, eco-friendly cleaning agent that does not produce secondary waste, and it can be used on a variety of surfaces.
6. Pest Control
It has almost instant effects, carries no danger for the environment, and is non-hazardous to humans. Dry ice is used to kill crawling pests such as bed bugs and mosquitoes, as well as rodents (rats).
Dry Ice Safety
- Dry ice can cause frostbites if touched with bare fingers. Wear protective gloves to avoid direct contact.
- Dry ice can preserve food, but when ingested, it can cause frostbite.
- Avoid using dry ice in poorly ventilated spaces where there is more than 5% C02 in the air.
Frequently Asked Questions About Dry Ice
Is dry ice dangerous?
Dry ice isn’t dangerous when used in ventilated areas, but when used in small spaces, it begins to release carbon dioxide gas, which can cause confusion, disorientation, headaches, breathing difficulties, and asphyxiation.
How much dry ice do I need?
To freeze food at home, approximately 10 to 15 lbs of dry ice per day is required, and twice as much for preserving food in display containers (for commercial use).
How cold is dry ice?
Dry ice is -109.2 F or -78.5° C cold.
How long does dry ice last?
Dry ice can last between 24 and 48 hours before it starts reverting to its original form – gas, depending on its quantity, ambient temperature, and the size of the cooler.
How to make dry ice last longer?
Dry ice will last up to 72 hours if it’s stored in special airtight containers. Never store dry ice in the refrigerator freezer because the temperature in there is too low for dry ice to remain solid. Avoid storing dry ice in plastic, glass, or ceramic containers.
How to dispose of dry ice?
You can dispose of dry ice by leaving it uncovered in a well-ventilated area at room temperature. Dry ice will sublimate to a gas if left uncovered in a garbage can or chemical waste container.
How does dry ice differ from liquid nitrogen?
In comparison to liquid nitrogen, dry ice is less cold and safer to handle because it is solid, while liquid nitrogen is much colder and more difficult to handle because it is liquid. As liquid nitrogen is too cold for these applications, it is used as a refrigerant instead and is used for preserving food and preventing bacterial growth instead.
Summary
You probably know what dry ice is if you drink carbonated drinks, root beer, or ice cream – but now you know how dry ice is made, too! That’s all we discuss here – ice and ice-making, and if you’d like to learn more, let’s meet next time!