In CCUS (Carbon Capture, Utilization, and Storage) technology, liquid carbon dioxide is injected into underground oil reservoirs to displace crude oil, thereby significantly enhancing the crude oil recovery rate. For instance, in a specific pilot area, the recovery rate achieved through water flooding was 15%, whereas CO2 flooding boosted the recovery rate to over 30%. This technology not only facilitates the permanent geological sequestration of carbon dioxide but also boosts crude oil production, thereby achieving the dual objectives of environmental protection and enhanced efficiency.
Liquid carbon dioxide serves as a vital raw material for the manufacture of various chemical products, including soda ash, baking soda, urea, ammonium bicarbonate, and methanol.
In the food industry, liquid carbon dioxide is utilized as a food additive for preserving cold beverages and carbonating beer, as well as for the preservation, storage, and low-temperature transport of foods such as fruits, vegetables, fish, cream, and ice cream. Its application in this context must strictly adhere to national standards, such as the *National Standard for Food Additives: Liquid Carbon Dioxide*.
Liquid carbon dioxide finds application in welding, fermentation processes, the production of cooling and carbonated beverages, the sugar industry, and medical local anesthesia. It also serves as an anti-foaming agent in large-scale steel casting, a plant growth stimulant, an antioxidant, and a fire-extinguishing agent.
Dry ice (solid carbon dioxide)-distinguished by its high latent heat of sublimation and superior cooling efficiency-is employed in various cryogenic applications, including low-temperature experiments, artificial rainmaking, the deburring of molded rubber components, and high-speed grinding. It also functions as a rapid-freezing and preservation agent for food products.
