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N-Butyraldehyde stands as a key intermediate in organic synthesis, bearing the molecular formula C4H8O. In the chemical industry, it takes form as a liquid, transparent and colorless, radiating a pungent, sharp odor. The structure features a straight-chain aldehyde, where the butyl group connects directly to the terminal carbonyl group, making it a member of the aliphatic aldehyde family.
A distinctive feature of n-Butyraldehyde is its moderate volatility. With a boiling point around 75–76 °C and melting point below −99 °C, it flows easily at room temperature. The density settles at 0.801 g/cm³ at 20 °C, so it floats on most water-based solutions. It dissolves slightly in water and points to high miscibility with organic solvents like ethanol and ether. Its reactivity allows it to serve as a foundational building block, especially because the aldehyde group undergoes various addition and condensation reactions. This reactivity demands cautious handling due to tendencies to polymerize slowly without stabilizers, forming unwanted byproducts in open environments.
Unlike many raw materials that come in flakes, crystals, solid or powder forms, n-Butyraldehyde nearly always appears as a clear, mobile liquid under standard storage conditions. It has no tendency to crystallize or precipitate in typical use, even at cooler temperatures, thanks to its low melting point. Its vapor spreads quickly, filling work areas if open containers remain unattended. That puts handling and storage requirements front and center for any operator, either in the warehouse or small-scale laboratory work.
Industry specifications call for minimum purity levels above 99.5%, particularly in applications demanding high-quality intermediates for coatings, plastics, or pharmaceuticals. The material’s HS Code, used for customs and international trade, registers as 2912190090. Every bulk shipment and technical data sheet highlights this identifier to avoid confusion with structurally similar compounds, such as iso-butyraldehyde. The molecular weight, clocking in at approximately 72.11 g/mol, remains central in dosing, blending and chemical calculations throughout production environments.
C4H8O depicts a four-carbon backbone with a single oxygen attached as an aldehyde functional group. The longest chain runs from the aldehyde's carbon through three more carbons, all arranged in a straight line. Visualizing the structure helps chemists plan out reactions, whether they’re reducing it to n-butanol, using it in Aldol condensations, or transforming it into plasticizers. The arrangement leaves one end of the molecule highly reactive, while the hydrocarbon tail provides stability and lipophilicity in organic reactions.
Dealing with n-Butyraldehyde brings several hazards. It can cause irritation to skin, eyes, and respiratory tract on contact or inhalation. Its vapors, heavier than air, often collect in low-lying areas or confined spaces, raising the risk of inhalation or flammability events. Flash point marks come in low at 6 °C, so sources of ignition need respect in any setting using or storing this material. Worker safety guidelines stress the importance of chemical goggles, nitrile gloves, and well-ventilated environments to avoid overexposure. Spill containment kits plus emergency shower and eyewash stations provide quick response if direct exposure occurs. Besides acute health risks, the material’s chemical reactivity requires storage in tightly sealed, inert containers away from oxidizing agents and acids, preventing unwanted polymerization or release of hazardous vapors.
Regulators classify n-Butyraldehyde as a hazardous material under multiple transport and workplace safety codes. Workers handling it follow strict labeling and documentation practices, including MSDS (material safety data sheets) dissemination and workplace signage. Marine shipping, road, and rail transport require markings for flammable liquids, with UN number 1129 keeping shipments consistently identified. Disposal guidelines set boundaries on how residuals can enter wastewater streams or municipal landfill, pushing most facilities to incinerate waste in approved combustion units with emission controls in place. Environmental scientists monitor accidental releases closely, since the compound volatilizes easily and travels with air currents or run-off water, potentially impacting local wildlife and aquatic systems.
N-Butyraldehyde acts as the backbone for a variety of valuable chemicals. Producers rely on it to generate n-butanol through catalytic hydrogenation, assemble 2-ethylhexanol for plasticizer manufacture, or feed into the condensation synthesis for industrial resins. It turns up in the chain of raw materials for solvents, dyestuffs, and certain pharmaceutical intermediates. The transformation from a simple aldehyde to specialized compounds only works smoothly when suppliers deliver the correct purity level aligned with downstream process needs. Chemical engineers design plant operations around its predictable reactivity, but have to incorporate continuous monitoring for leaks, polymerization, or hazardous releases.
Experience with n-Butyraldehyde highlights recurring hurdles in safe storage and transport. Warehouses have to install explosion-proof ventilation, routinely check for leaks, and avoid using incompatible storage materials such as natural rubber. Monitoring vapor concentrations with electronic sensors means that exposure events get caught before they put people at risk. Supply chains need traceability from producer to end user; batch records, HS Code tracking, and export certificates play a real role in keeping operations smooth and regulatory teams informed. Worker training, periodic drills, and up-to-date PPE standards keep teams familiar with the risks and responses needed. On the environmental side, closed-loop systems with vapor recovery and on-site waste treatment keep loss and emissions controlled in modern installations.
