Carbon dioxide

Carbon dioxide is a colorless, odorless gas with the chemical formula CO2 and CAS number 124-38-9. It is a naturally occurring compound consisting of one carbon atom bonded to two oxygen atoms, with a molecular weight of 44.009 g/mol. Carbon dioxide is essential for photosynthesis and is produced through combustion, respiration, and fermentation processes. At standard conditions, it exists as a gas but can be compressed into liquid form or solidified into dry ice.

Carbon dioxide is a colorless, odorless, and non-flammable gas at room temperature and pressure. It has a density of 1.98 kg/m³, making it heavier than air. CO2 is moderately soluble in water, forming carbonic acid. It sublimes directly from solid to gas at -78.5°C at atmospheric pressure. The gas is chemically stable under normal conditions and does not support combustion, making it effective as a fire suppressant.

Carbon dioxide serves multiple industrial and commercial purposes including food and beverage carbonation, refrigeration as dry ice, fire suppression systems, and welding applications as a shielding gas. It is widely used in chemical synthesis, pH control in water treatment, and as a solvent in supercritical extraction processes. Additionally, CO2 is employed in greenhouse cultivation to enhance plant growth and in oil recovery operations.

Carbon dioxide requires careful handling due to asphyxiation risks in confined spaces. Ensure adequate ventilation in work areas and use gas detection equipment to monitor CO2 levels. When handling pressurized containers, wear safety glasses and protective gloves. Never enter confined spaces with elevated CO2 concentrations without proper respiratory protection. Store cylinders upright, secure them properly, and avoid rapid pressure changes that could cause thermal shock.

Carbon dioxide should be stored in approved pressure vessels in well-ventilated areas away from heat sources and direct sunlight. Keep cylinders upright, properly secured, and at temperatures below 50°C. Storage areas must have adequate ventilation to prevent accumulation of CO2 gas. Separate full and empty cylinders, and ensure storage locations are accessible for emergency response. Regular inspection of storage equipment is essential for safety.

Carbon dioxide exposure primarily causes asphyxiation rather than toxicity. If someone experiences CO2 exposure, immediately move them to fresh air and ensure adequate ventilation. For unconscious persons, check breathing and pulse, and administer artificial respiration if necessary. Seek immediate medical attention for severe exposure cases. In case of contact with dry ice, treat as frostbite with lukewarm water and avoid direct skin contact.

Carbon dioxide disposal involves controlled release into well-ventilated areas, as CO2 is a naturally occurring atmospheric component. For pressurized containers, slowly vent the gas outdoors away from confined spaces and ignition sources. Empty cylinders should be returned to suppliers or authorized gas distributors. Dry ice should be allowed to sublimate in ventilated areas. Follow local environmental regulations regarding large-scale CO2 emissions and waste management.

Carbon dioxide is classified under ADR Class 2 (gases) for transportation purposes. It must be transported in approved pressure vessels with proper labeling and documentation. Vehicles must be well-ventilated and equipped with appropriate emergency equipment. Drivers require ADR training for dangerous goods transport. Ensure proper securing of cylinders during transport and avoid exposure to excessive heat or mechanical damage that could compromise container integrity.

Carbon dioxide is regulated under various European frameworks including CLP regulation for classification and labeling, though it has no specific hazard classification. REACH registration requirements apply for commercial quantities. Transportation is governed by ADR regulations for dangerous goods. Workplace exposure limits are established under occupational health regulations. Environmental regulations may apply for large-scale emissions, and specific industry standards govern its use in food applications.

Carbon dioxide is available through OYSI, a European distributor of chemical products, offering reliable supply across European markets. Professional suppliers provide various grades including food-grade, technical, and research-quality CO2 in different packaging options from small cylinders to bulk liquid storage. When selecting a supplier, consider purity requirements, delivery capabilities, technical support, and regulatory compliance to ensure product suitability for your specific applications.