Product Overview
High Purity Carbon Dioxide,Carbon dioxide standard gas is a specialized grade of CO₂ characterized by extremely low levels of impurities, tailored for applications where standard industrial or beverage-grade carbon dioxide would introduce contamination. Produced and purified to exacting specifications, high purity carbon dioxide is essential in fields such as electronics manufacturing, supercritical fluid extraction, advanced welding, and analytical science. The consistency and purity of Carbon dioxide standard gas directly impact product quality, process efficiency, and analytical accuracy in these sensitive applications.
Basic Information
| CAS No. | 124-38-9 |
| UN No. | UN1013 (Carbon dioxide) or UN2187 (Carbon dioxide, refrigerated liquid) |
| Molecular Formula | CO₂ |
| Hazard Classification | 2.2 (Non-flammable, non-toxic gas); 5.1 (Oxidizing agent in specific contexts). Can act as an asphyxiant in high concentrations. |
Key Attributes & Parameters
| Purity | Available in various high-purity grades, typically ranging from 99.9% (3.0) to 99.9999% (6.0) and beyond. Specifications are defined by critical impurity limits. |
| Critical Impurity Specifications (for 99.999% Grade example) |
Moisture (H₂O): < 3 ppmv Oxygen (O₂): < 2 ppmv Total Hydrocarbons (THC): < 1 ppmv (as CH₄) Nitrogen (N₂): < 10 ppmv Carbon Monoxide (CO): < 1 ppmv Sulfur Compounds (as H₂S): < 0.1 ppmv |
| Physical State | Colorless, odorless gas; supplied as a high-pressure gas in cylinders, as a refrigerated liquid in dewars or bulk tanks, or in solid form (dry ice). |
| Dew Point | Can reach -60°C or lower, indicating very low moisture content. |
Features & Advantages
Ultra-Low Contaminant Levels
Stringent control of moisture, oxygen, and hydrocarbons prevents oxidation, contamination, and side reactions in sensitive processes like semiconductor fabrication and supercritical fluid extraction.
Consistent and Reliable Performance
Guaranteed purity ensures reproducible results in analytical applications, stable arc performance in welding, and predictable solvent behavior in supercritical processes.
Versatile Process Medium
Functions effectively as a supercritical fluid, shielding gas, cryogenic coolant, and reagent, with its high purity enabling use in the most demanding technical applications.
Critical for Advanced Manufacturing
Essential for processes where impurity-induced defects are unacceptable, such as in laser cutting of high-reflectivity metals or the production of optical fibers.
Functional Characteristics
Carbon dioxide standard gas serves multiple advanced functions. In its supercritical state (above 31°C and 73.8 bar), it becomes a powerful, tunable solvent for extraction and cleaning, leaving no residual solvent. As a shielding gas in welding (often mixed with argon), it stabilizes the arc and influences bead geometry, with purity being critical for weld integrity on reactive metals. In electronics, it is used for wafer cooling and as a process gas in certain plasma etches. Its inertness and low reactivity, combined with high purity, make it suitable for blanketing and sparging sensitive chemicals. It is often further purified at the point of use for the most critical applications.
Primary Application Fields
F Supercritical Fluid Extraction (SFE)
The solvent of choice for decaffeinating coffee, extracting hops, and producing high-value pharmaceutical and nutraceutical compounds due to its tunable solvation power and clean residue profile.
Electronics & Semiconductor Manufacturing
Used in critical cleaning processes (supercritical CO₂ cleaning), as a cryogenic coolant for testing, and in certain plasma etching and deposition processes.
Laser Cutting & Welding
As an assist gas for cutting non-ferrous metals like aluminum and as a component in shielding gas mixtures (e.g., C25) for Metal Inert Gas (MIG) welding, where purity affects weld quality.
Analytical Instrumentation
Serves as the mobile phase in supercritical fluid chromatography (SFC) and as a calibration gas.
Food Processing & Packaging
Used in Modified Atmosphere Packaging (MAP) for sensitive products, where purity prevents off-flavors and spoilage.
Research & Development
Employed in laboratories for chemical synthesis, particle generation (RESS process), and as a reaction medium.
Customer Collaboration Case
A pharmaceutical company developing a new class of lipid-based injectable drugs needed an ultra-clean and efficient method to remove residual solvents and impurities from their final product. Traditional methods risked degrading the delicate active ingredients. We partnered with them to implement a Supercritical Fluid Extraction (SFE) process using our 99.998% high purity carbon dioxide. Our solution included a dedicated, certified supply of high purity carbon dioxide with stringent controls on hydrocarbons and moisture, along with technical support to optimize pressure and temperature parameters. The supercritical high purity carbon dioxide acted as a remarkably effective and gentle solvent, removing over 99.9% of residual solvents without damaging the complex lipid structures. This resulted in a purer final product, a 70% reduction in processing time compared to traditional methods, and the elimination of toxic solvent waste. The success of this project, hinging on the consistent quality of our high purity carbon dioxide, enabled the customer to scale up production and accelerate regulatory approval for their novel therapy.
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