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Product Name: Oxalyl Chloride
Chemical Formula: C2Cl2O2
Synonyms: Ethanedioyl dichloride
CAS Number: 79-37-8
Molecular Weight: 126.93 g/mol
Appearance: Colorless to pale yellow liquid, sharp and irritating odor
On a lab bench or in a barrel on the factory floor, oxalyl chloride usually shows up as a fuming, volatile liquid. Its biting odor hits the nose; vapor makes eyes water and lungs burn even before reading the label. Identifying this chemical fast matters because a mix-up can set off dangerous chain reactions — both with the stuff itself and with the environment around it.
Hazard Class: Acute toxicity, Skin corrosion, Severe eye damage, Specific target organ toxicity
Primary Hazards: Corrosive to eyes, skin, and respiratory system; causes severe burns; toxic if inhaled or ingested
Emergency Overview: Contact releases choking clouds of phosgene (toxic gas), hydrochloric acid, and carbon monoxide
Oxalyl chloride draws a hard line: it tears up tissue, starting with the eyes and lungs. Once, in a poorly vented lab, even opening a bottle sent co-workers scrambling from its gagging fumes. It’s not a risk to wave away — it will burn chemically and leave lasting harm, in a moment’s mishap.
Chemical Name: Oxalyl Chloride
Purity: Usually greater than 99%
Contaminants: Trace hydrochloric acid, phosgene as decompositional impurities
Anything added to oxalyl chloride’s bottle, even water mist, may kick off a destructive reaction. This purity, or lack of it, changes how violently it reacts and what gases pour out. Purity above 99 percent tells the user: dangerous on its own, unpredictable when contaminated.
Inhalation: Move the exposed person to fresh air immediately, keep them warm and quiet; administer oxygen if breathing is difficult; seek immediate medical attention
Skin Contact: Remove contaminated clothing, flood skin with water for at least 15 minutes; get medical help
Eye Contact: Rinse eyes cautiously with water for at least 15 minutes, lifting eyelids; seek emergency care
Ingestion: Do not induce vomiting; wash mouth thoroughly; immediate medical help required
Doctors and emergency responders often don’t see chemical burns like this outside of industrial environments. Water is the only reliable partner here, flooding the chemical away at the first sign, but speed decides the outcome. Delaying a hospital visit after a splash or inhalation isn’t a gamble; it’s a guarantee of serious damage.
Suitable Extinguishing Media: Dry sand, carbon dioxide, chemical powder; never use water
Unusual Hazards: Fire liberates toxic gases, including hydrochloric acid and phosgene; exothermic reactions with water erupt quickly
Protective Equipment: Full chemical protective suit and self-contained breathing apparatus
Putting out a fire around oxalyl chloride is not just about dousing flames. I’ve seen water used once, and the violent clouds and hissing that followed are not easily forgotten. It turns firefighting into a battle against more than just heat—smoke filled with toxic gases quickly chokes out hope of easy control. Teams need special training and gear for these fires.
Personal Protection: Evacuate unnecessary personnel, don proper chemical suit and breathing protection
Spill Clean-up: Absorb with dry, inert material (such as sand, vermiculite); avoid water; ventilate area well; neutralize residual amounts with sodium bicarbonate if taught and trained
Environmental Precautions: Prevent entry into drains, waterways, or soil to limit wider contamination
A spill of oxalyl chloride isn’t swept up with a mop. Each accidental release puts everyone at risk—clean-up cannot start until everyone is clear and the right suits go on. In my experience, even small spills lock down operations. Fumbling clean-up or letting it get into a drain means putting entire facilities and surrounding communities at risk.
Handling: Always work in a chemical fume hood or ventilated area; wear full protective gear, including goggles, gloves, apron; prevent contact with water, alcohols, bases, and amines
Storage: Keep tightly closed and in a dry, cool, well-ventilated space; store away from moisture, direct sunlight, and incompatible materials; segregate from acids, bases, oxidizers, and combustibles
For those on the ground, mistakes start with complacency. One unsealed cap in humid weather, or a drop of rain near a transfer hose, and the consequences can leave scars — physically or legally. Dry, locked spaces and daily checks become routines that save lives. Storage containers need regular inspection for leaks or corrosion long before trouble starts.
Engineering Controls: Arm every workspace with local exhaust ventilation; use vented enclosures or fume cabinets constantly
Personal Protective Equipment: Chemical splash goggles, face shield, impervious gloves, lab coat or full chemical suit for large amounts, supplied-air respirator for possible vapor exposure
Limiting exposure means fighting laziness and forcing routines. I’ve watched seasoned workers skip steps, only to be sidelined for weeks by careless contact. Good equipment—regularly replaced—not only shields workers from burns and lung damage, it protects families and communities from what could be brought home on skin or clothes.
Appearance: Clear to pale yellow, volatile liquid
Odor: Pungent, choking
Boiling Point: 63°C (145°F)
Melting Point: -10°C (14°F)
Vapor Pressure: High, fuming at room temperature
Solubility: Reacts violently with water, forming toxic gases
Specific Gravity: 1.48 (water = 1)
Just opening the bottle can fog up safety glasses—its volatility reminds everyone nearby not to linger or breathe unfiltered air. Its low boiling point and high vapor pressure mean it won’t sit still, and a few degrees’ difference in the room pushes it from liquid to toxic cloud.
Chemical Stability: Unstable with moisture, alcohols, amines, and bases
Reactivity: Fierce exothermic reaction with water, giving off hydrogen chloride and carbon monoxide
Hazardous Decomposition: Phosgene, hydrochloric acid, carbon monoxide
Every logistics coordinator or researcher spending time around oxalyl chloride learns it survives in tight, dry containers. Once exposed to humidity or common solvents, even a drop, it becomes an unpredictable source of poisonous fumes. Routine inspections and fixed procedures do more to prevent accidents than fancy warning labels could ever hope.
Acute Effects: Severe irritation and burns to skin, eyes, and respiratory system; inhalation causes coughing, shortness of breath, and could lead to delayed pulmonary edema
Chronic Exposure: Repeated contact results in dermatitis, chronic lung conditions
Lethal Dose: Data indicates category 3 and category 4 acute toxicity for oral and dermal exposure in animal models
Coming face-to-face with oxalyl chloride’s effects leaves a lasting memory. Just one small misstep can land someone in intensive care, gasping for air or with irreparable eye damage. Safety talks and warning posters matter when every exposure has consequences beyond short-lived pain – the risks extend for days beyond an initial splash or whiff.
Environmental Fate: Reacts with water in soil or air, creating highly toxic byproducts
Aquatic Toxicity: Toxic to aquatic life due to hydrochloric acid and phosgene formation
Persistence: Degrades, but byproducts linger in the environment
Environmental release rarely ends without a call to emergency hazmat teams. In the aftermath, fish kills and water system shutdowns often follow. Responding quickly means containing every drop before it has the chance to meet water or soil — and monitoring possible damage for months, sometimes years.
Methods: Destruction by incineration at high temperature in a facility equipped to handle acid gases; neutralize with great caution using suitable agents before final disposal
Preventative Measures: Avoid contact with water or alcohols in disposal process; trained personnel only
Having seen accidents during waste handling, disposal makes demands far beyond routine garbage collection. Only specialized incinerators and trained professionals can neutralize its destructive edge. Shortcuts lead to explosions, gas clouds, and costly environmental fines — not just for the business, but for the communities nearby.
UN Number: 3290
Proper Shipping Name: Oxalyl chloride
Hazard Class: 6.1 (Toxic), 8 (Corrosive)
Packing Group: I (high danger)
Strict shipping regulations force companies to double-check packaging and labeling steps, train drivers, and document routes. On the road, even a minor crash could provoke a disaster. Regulatory paperwork might look like red tape, but those steps keep highways, rail lines, and communities safer from potentially fatal exposures.
Major Regulations: Classified as a hazardous chemical under international transport and workplace safety laws; included on hazardous substance inventories and reporting lists
Regulatory Requirements: Detailed documentation and training for all users; stringent facility permitting and reporting
Oversight of this chemical keeps growing. Regular audits, on-site inspections, and show-your-work paperwork mean operators can’t slide by on habit alone. Regulations require not just compliance, but a culture of safety and vigilance. Failure to follow through brings more than legal threats; it brings lasting consequences for workers, neighbors, and the planet.
