How to Make Dry Ice

Oh, wait! Did you think that making ice is nothing more than filling ice-trays with water, and let the refrigerator do its job? Get yourself correct today, as we're going to learn how to make 'dry ice'. Ice that is dry? Yes. Solid carbon dioxide (CO₂), and totally pure, dry ice is called dry because it does not melt. Instead, it takes a leap from the solid state directly to the gaseous state. This process is known as sublimation. Astonishingly, dry ice keeps items cold for a longer period of time in comparison to the conventional ice that is prone to melting. Making dry ice is a bit of a hassle-prone task as it calls for a number of scientific items. The carbon dioxide content used in making dry ice is recycled - it is fetched as a by-product of industrial processes.

Making dry ice home is not recommended, the reason being the fact that it needs special attention and intensive care. Dry ice has a number of uses, both industrial as well as personal. For example, in its gaseous state, it is used to create a smoky effect in parties. What's more, it is used at home to preserve food since dry ice temperature is way too low (-78.5° C). Ice-creams and medicines have a good time with dry ice because of its extremely low temperature. On the other hand, dry ice has many industrial uses such as blast cleaning which is unbelievably hard otherwise. Repairing pipes by freezing the water inside is a common dry ice experiment. All things considered, let us get acquainted with the process of making dry ice, both commercially and at home.

Commercial Method

Industrial infrastructure, such as ethanol plants, produce carbon dioxide as a by-product, which is then pressurized, and converted into liquid state. Furthermore, it is kept in a tank that is covered. However, when the carbon dioxide is exposed to surrounding temperature, some amount of the carbon dioxide that was in its liquid state gets converted into gas, whereas, the rest of the liquid gets converted into ice. Then, dry ice is modeled into blocks with the help of hydraulic pressure along with a pelletizer. This is how dry ice is produced commercially in large quantities. However, dry ice can be made at home too, keeping in mind the safety and rendering special attention. To produce dry ice at home, you need to be experienced enough. Know more in the following section.

At Home

No, it's not that easy. Instead, it's risky. First things first, dry ice has an extremely low temperature, as stated before, and hence, even a normal contact may cause skin irritation, and in no way, can you consume dry ice like those normal ice cubes present in your freezer. So, in order to make dry ice at home, things needed would be good-quality gloves, a cloth bag, carbon dioxide (extinguisher), glasses that protect your eyes, and a duct tape. You are supposed to choose a place that is secluded and empty for making dry ice.

Firstly, wear your gloves and glasses. Do not take them off until you finish making dry ice.

Secondly, put the cloth bag onto the floor. Take out the duct tape, and secure the opening of the cloth bag to the CO₂ extinguisher's nozzle. When that's done, put a cloth bag on the floor again, setting the bottom of the bag towards the workspace.

Thirdly, release the CO₂ by pressing the extinguisher level down, allowing it to spray into the bag. Do it continuously for 10-15 seconds, thus, removing the tap from both the bag as well as the nozzle. This is how dry ice will be created as the carbon dioxide will expand, thereby, solidifying. When you start seeing a snow-like substance misting at the bottom of the bag, it is confirmed that it's dry ice.

Lastly, take a big container, and turn the opening of the bag into the container, and let the dry ice get in. Use it whatever way you want, and cast away after you're done using it as it is not safe in any way.

One of the most important things to be kept in mind while making dry ice is not to touch it or hold it with bare hands. Use tongs or holders, instead. All in all, better know where to buy dry ice, rather than make it yourself. It's safer.