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Chemical Name: 2-Chlorobenzoyl Chloride
Synonyms: o-Chlorobenzoyl chloride
Molecular Formula: C7H4Cl2O
Appearance: Usually a colorless to pale yellow liquid, sometimes characterized by a pungent, acrid odor that can be difficult to forget once encountered.
CAS Number: 87-62-7
In labs and chemical warehouses, this is a compound that doesn’t blend into the background. Its sharp aroma signals a need for respect, especially from anyone who has dealt with strong acylating agents.
GHS Classification: Corrosive to skin and eyes, serious eye damage, harmful if inhaled, may cause respiratory irritation.
Pictograms: Corrosion, exclamation mark.
Hazard Statements: Causes severe skin burns and eye damage, serious irritation to eyes and mucous membranes, problematic for lungs if vapors escape control.
Handling acyl chlorides always demands awareness. I learned quickly that careless exposure, even brief, means burning pain or lasting eye injury. Staff working nearby must know they’re dealing with something aggressive; nobody can afford to take shortcuts with safety goggles or acid-resistant gloves.
2-Chlorobenzoyl chloride comes in high concentration—professionals rarely see it diluted. Sometimes, minimal impurities remain from manufacture but never enough to change the essential hazard profile. The product basically brings the same risk features you’d expect from pure acyl chlorides.
Inhalation: Move to fresh air quickly. Exposure feels caustic, so keep rescue response prompt; give oxygen if breathing gets difficult.
Skin Contact: Remove affected clothing and rinse well with water, for at least fifteen minutes. In my experience, neutralizing chemicals like sodium bicarbonate can help stop persistent stinging, but only after thorough rinsing.
Eye Contact: Eyes suffer fast—flush with water for at least fifteen minutes, lifting eyelids. Medical attention right away saves vision.
Ingestion: Rinse mouth, avoid vomiting, and get medical help immediately.
Colleagues who’ve handled accidental splashes know the agony of delayed rinsing. Emergency showers and eye wash stations must be in working order wherever this compound sits on a shelf.
Suitable Extinguishing Media: Use dry powder or carbon dioxide. Water can make things worse since it reacts violently and releases hazardous gases like hydrogen chloride.
Specific Hazards: Burning brings toxic fumes. The fire might release hydrochloric acid mist, phosgene, or other hazardous decomposition products.
Personal Protective Equipment: Full protective gear, self-contained breathing apparatus.
Sprinklers going off with reactive chemicals like 2-chlorobenzoyl chloride often means more harm than good. That’s something safety briefings never skip. Keeping dry chemical extinguishers nearby is a must.
Personal precautions: Ventilate immediately, keep people back, wear chemical goggles, gloves, and acid-resistant clothing.
Spill cleanup methods: Absorb spills with inert substance (like vermiculite or sand), never paper towels. Collect residue in a sealed chemical waste container—cleaning with water increases risk.
Owners of older lab floors sometimes have pitted tiles from past mistakes; supervisors reinforce never to treat spills with water and always keep respiratory protection handy.
Handling: Use in fume hood, keep containers closed. Don’t work alone, and avoid contact with skin, eyes, or clothing.
Storage: Store in tightly sealed glass or corrosion-resistant containers, cool dry area, away from bases, water, or oxidizers.
Repeated reminders about storing acyl chlorides separately keep everyone safe. Labeling and training go hand in hand—newer colleagues sometimes underestimate how little exposure it takes to trigger a hazardous event.
Engineering Controls: Chemical fume hoods required. Natural ventilation rarely helps enough.
Personal Protection: Nitrile gloves, splash goggles, lab coats, and sometimes face shields, especially with larger volumes.
Respiratory Protection: If fume hood unavailable or exposure likely, use an approved respirator.
Anyone who’s worked full shifts knows how quickly a minor leak becomes a full-blown emergency without the right gear—skipping gloves or eye protection feels foolish if you’ve seen the damage up close.
Physical State: Liquid under ambient conditions.
Odor: Strong, acrid, can make you back away instantly.
Melting Point: Around -18°C
Boiling Point: Between 210–212°C
Solubility: Reacts exothermically with water, creating hydrochloric acid.
Density: About 1.36 g/cm³
People who have poured it know it’s heavier than expected; even a minor spill can pool rapidly. Solubility with water pulls experienced handlers to keep wet hands far away.
Chemical Stability: Stable under dry, cool conditions.
Conditions to Avoid: Moisture, heat, direct sunlight.
Incompatible Materials: Water, strong bases, alcohols, amines.
Hazardous Decomposition: Hydrogen chloride, phosgene, other dangerous gases.
The panic sets in quickly if water contamination occurs—no one forgets the sight of vapor clouds rolling off pooling acid, no matter how seasoned.
Potential Health Effects: Harmful by inhalation, ingestion, or contact; severe burns and eye damage possible.
Acute Symptoms: Burning, coughing, choking, nausea, dizziness, and skin corrosion.
Long-term Exposure: Chronic exposure risks include persistent respiratory irritation, possibly dental erosion.
Safety training often highlights real-world stories—crafting respect for the compound’s toxicity runs deeper than reading warning labels.
Environmental Hazards: Harmful if released into water; can acidify aquatic environments, endangering aquatic life.
Persistence and Degradability: Hydrolyzes rapidly in water to form hydrochloric acid and 2-chlorobenzoic acid.
Bioaccumulation: Not likely, but the acute toxicity to aquatic organisms means environmental protection matters as much as personal safety.
Discussions on spill drills don’t end with human health; proper containment aims to protect the drains, local soil, and water supplies from accidental discharge.
Waste Treatment: Incinerate under controlled conditions; never pour down drains.
Contaminated Packaging: Handle as hazardous waste, do not rinse out containers in regular sinks.
People who’ve handled chemical disposal for years have seen what happens when shortcuts are taken—a lingering chlorine smell and corroded pipes teach tough lessons.
Proper Shipping Name: Chlorobenzoyl chloride, 2-
Hazard Class: Corrosive liquid.
Packing Group: II or III, depending on concentration and local rules.
Warning signs on containers and strong chemical odors serve as reminders. Protective packaging gets checked by everyone involved in transfer—not just the transport drivers.
Regulated Under: Most countries regulate it as a hazardous, corrosive substance. Workers must have specific training and access to documented control procedures.
Safety authorities emphasize practical steps—clear communication, hazard labeling, access restrictions—more than ever. Legal frameworks support the daily routines that keep people and their communities from suffering chemical accidents.
