Overview
Liquid carbon dioxide (CO₂) is a cryogenic form of carbon dioxide stored under high pressure or at very low temperatures. It is a versatile industrial chemical with applications ranging from food processing to metal fabrication. Due to its non-flammable nature and ability to sublimate directly from solid to gas, it is favored in environments where traditional chemicals pose safety risks. CO₂ is typically produced as a byproduct of ammonia synthesis or ethanol fermentation, then purified and liquefied for commercial use. Its inert properties make it suitable for use in sensitive environments, such as food preservation or pharmaceutical manufacturing.
Physical and Chemical Properties
Liquid CO₂ has a density of 1.56 g/cm³ at -37°C and sublimates at -78.5°C under standard pressure, bypassing the liquid phase. It is slightly soluble in water, forming carbonic acid, which gives carbonated beverages their tangy taste. Its low viscosity and high thermal conductivity make it effective for cooling applications. Under pressure, liquid CO₂ can exist at higher temperatures (up to 31.1°C, its critical point). Beyond this, it becomes a supercritical fluid, useful for extraction processes like decaffeination. Its triple point (-56.6°C at 5.1 atm) is key to storage and handling protocols.
Main Applications
In the food industry, liquid CO₂ is used for carbonating beverages, freezing products (e.g., ice cream), and modified atmosphere packaging to extend shelf life. It is also a critical agent in fire suppression systems, displacing oxygen without leaving residues. Industrially, it serves as a shielding gas in welding (MIG/MAG processes) and a solvent in supercritical fluid extraction for pharmaceuticals. Additionally, dry ice (solid CO₂) derived from liquid CO₂ is used for cleaning and cold chain logistics. Emerging applications include enhanced oil recovery and carbon capture technologies.
Safety and Storage
Liquid CO₂ must be stored in DOT-approved cylinders or insulated tanks to maintain low temperatures (-20°C to -18°C). Leaks can cause rapid freezing or asphyxiation in confined spaces; thus, storage areas require ventilation and oxygen monitors. Personal protective equipment (PPE) like insulated gloves and face shields is mandatory during handling to prevent cryogenic burns. Transport regulations classify it as a non-flammable gas (UN 2187), requiring hazard placards and pressure relief valves. Never seal containers completely, as heat ingress can cause dangerous pressure buildup.
B2B Procurement Guide
When sourcing liquid CO₂, prioritize suppliers with certifications like ISO 9001 or food-grade compliance (e.g., FDA, EFSA). Specify purity levels (e.g., 99.9% for beverage use) and request moisture/impurity test reports. Logistics are critical: ensure the supplier offers cryogenic transport or cylinder exchanges. Bulk purchases (e.g., tanker loads) reduce costs but require on-site storage infrastructure. For spot purchases, compare prices per kilogram or ton, factoring in delivery distances. Long-term contracts often include maintenance for storage equipment.
Related Manufacturers
- 主营：[]
- 主营：[]
- 主营：[]
- 主营：[]
- 主营：高压试压泵、高压清洗泵、高压柱塞泵、二氧化碳泵、高压泵、高压往复泵、油田注水泵、高压除磷泵
- 主营：气化器、汽化器、调压阀、二氧化碳、液体二氧化碳、液态氧气、瓶装液态氧气、减压阀组、燃气设备、汽化减压撬、低温气化设备、液氧气化装置、燃气减压装置、压力调节阀组、天然气散冷设备、调压装置减压阀、液氮、液氧、液氩、液氮储罐、液氧储罐、液氮气体、高纯液氮气体、工业液氮气体、工业高纯液氧气体
- 主营：高纯氮、高纯氦气、高纯氩气、高纯二氧化碳、二氧化碳、食品二氧化碳、液氮、医用氧气、氧气乙炔氮气、氧气、乙炔、氮气、氩气、六氟化硫、高纯氮气、甲烷
- 主营：液氧、液氩、液氮、高纯二氧化碳、氧气、氩气、氮气
- 主营：氮气液氮、氩气液氩、氧气液氧、二氧化碳、食品级二氧化碳、高纯二氧化碳、乙炔、甲烷、乙烯、六氟化硫、准分子激光混合气、同位素气体、氖气、氪气、氘气、氢气、一氧化氮、硅烷、氦气、激光混合气体、液氦、高纯氦气、食品级氮气、高纯氮气
- 主营：制冷剂、活性剂、溴甲烷、液态氮气、液态氧气、正戊烷、】乙烯、溴化氢、灭火剂、无味钢瓶、高纯氩气、四氟化碳、双层真空、高纯甲烷、标准气体、三氟甲烷、高纯氧气、高压氦气、二氟甲烷、钢瓶包装、瓶装气体、工业甲烷、氩气气体、氮气氢气、六氟化硫
- 主营：气瓶检测设备、水压试验设备、压力检测设备、液态二氧化碳充装机、气瓶自动化设备、阀门流量流阻系数试验、呼吸阀校验台、压力表校验台、安全阀校验台、流量计壳体水压试验机、阀门水压试验机、气瓶充装设备、测试台、爆破机、试验机、压缩机、疲劳机、增压泵、呼吸器
- 主营：布料机、圆盘锯、岩石锯、二氧化碳爆破设备、劈石机、破裂机、修剪机、伸缩臂、劈裂机、撑裂机、混凝土、割草机、膨胀机、低开石、截桩机、石分裂、机器石、破桩机、分裂机、开采石头、隧道掘进、硬度岩石、桩破除机、放炮开山、分裂设备、自动设备
- 主营：储液罐、调压阀、真空管、储存罐、存储罐、气化器、供气管、液氮管、制氮机、输送管、速冻机、节能管、氧气瓶、汽化器、气化设备、供氮设备、精密仪器、低温容器、液体管道、低温储罐、电子元件、气体管道、液氮储罐、低温管道、燃气设备
- 主营：工业气体、高纯氦气、黑色钢瓶、二氧化碳、干冰、液氮、丙烷、液氧、液氩
- 主营：工业气体、标准气体、食品级氮气、食品级二氧化碳、高纯二氧化碳、高纯氦气、混合气、高纯气体、高纯氩气、高纯氮气
- 主营：氩气、氧气、氮气、二氧化碳、混合气、氦气、甲烷、乙炔、乙烯、氢气、六氟化硫
- 主营：标准气、高纯氮气、六氟化硫、高纯二氧化碳、高纯氦气、氩混合气、高纯乙炔、一氧化碳、高纯氩气、高纯氧气
- 主营：工业气体、干空气、混合气、二氧化碳、食品级二氧化碳、标准气、氧气、同位素、超高纯气体、电子气体、高纯氮气、高纯氩气、液氧、液氩、高纯氦气、液氮