Product Name: 2,4-Dimethylbenzenesulfonic Acid Dihydrate
CAS Number: 6398-98-7
Synonyms: 2,4-Xylenesulfonic Acid Dihydrate
Recommended Use: Organic synthesis, laboratory reagent, catalyst applications
Supplier Information: Chemical supplier details including address and emergency contact phone numbers
Emergency Contact: ChemWatch, local poison control, or designated emergency response line for immediate advice on chemical exposure
Classification: Skin irritation, eye damage, potential acute health hazard
GHS Label Elements: Corrosive pictogram, exclamation mark for irritant properties
Hazard Statements: Causes severe skin burns and eye damage, harmful if swallowed, may cause respiratory irritation on dust inhalation
Precautionary Statements: Wear protective gloves and face shield, avoid breathing dust or fumes, wash hands thoroughly after use, use only in well-ventilated areas, store locked up away from incompatible substances
Emergency Overview: Off-white crystalline solid, strong or pungent odor, dust may irritate mucous membranes
Chemical Name: 2,4-Dimethylbenzenesulfonic Acid Dihydrate
CAS Number: 6398-98-7
Purity: ≥ 98%
Formula: C8H10O4S·2H2O
Ingredient Contribution: Main active substance, two molecules of water per formula unit accounted into mass and handling conditions
If Inhaled: Remove person to fresh air immediately, seek medical help if symptoms like coughing, shortness of breath, or throat irritation develop
If On Skin: Flush affected area with copious amounts of running water, remove contaminated clothing, continue rinsing for 15 minutes, get medical attention for persistent irritation, chemical burns, or blisters
If In Eyes: Rinse eyes cautiously under running water for at least 15 minutes, lifting eyelids occasionally, do not allow victim to rub eyes, seek urgent medical examination
If Swallowed: Rinse mouth with water, do not induce vomiting, provide water or milk if victim is conscious, seek immediate medical attention due to corrosive nature
Potential Symptoms: Burning sensation, severe irritation, tissue redness, blistering, gastrointestinal upset, respiratory irritation if dust is inhaled
Note to Physician: Treat symptomatically and monitor for delayed tissue damage and respiratory complications
Suitable Extinguishing Media: Water spray, dry chemical powder, foam, carbon dioxide, avoid direct water jets on molten chemical
Hazards During Fire: Sulfur oxides, toxic organic fumes may develop upon combustion or high temperatures
Protective Equipment: Full protective gear, self-contained breathing apparatus required for large scale fires
Special Procedures: Move containers from fire area if safe, prevent runoff into drains and waterways, use water spray to cool exposed surfaces
Flash Point: Not established for dihydrate, expected to be high, low flammability under normal storage conditions
Hazardous Combustion Products: Sulfur dioxide, carbon monoxide, carbon dioxide, possible volatile aromatics
Personal Precautions: Keep unnecessary personnel away, ventilate area, wear full chemical-resistant gear including gloves, goggles, and respirator if dust is present
Environmental Precautions: Contain spill immediately, prevent large quantities from entering waterways or soil, report to local authorities if significant release threatens public area
Clean-up Methods: Carefully sweep or shovel solid into suitable, labeled containers for disposal, avoid generating or inhaling dust, rinse residue with water if safe to do so, ventilate area thoroughly
Decontamination Procedures: Wash down area with soap and plenty of water after bulk removal, ensure disposal water does not reach drains untreated
Special Consideration: Use barriers for large spills, notify supervisor and follow site procedures for hazardous chemical management
Handling: Operate in well-ventilated area or fume hood, avoid contact with skin, eyes, and clothing, do not eat or drink around material, use proper protective gear, keep containers tightly closed when not in use
Storage: Store in cool, dry, well-ventilated location away from moisture, oxidizers, strong bases, and direct sunlight, keep containers labeled and secure from physical damage, segregate from incompatible chemicals
Hygiene Practices: Always wash hands thoroughly with soap and water after handling, remove and wash contaminated clothing before reuse, keep work surfaces clean
Special Precautions: Do not allow material to come into contact with metal surfaces susceptible to corrosion, monitor for buildup of dust or residue, use spill trays and secondary containment if possible
Exposure Limits: No established OSHA or ACGIH occupational exposure limits for this compound, maintain workplace air concentrations as low as achievable
Ventilation: Use local exhaust ventilation or fume hood to keep airborne levels low
Respiratory Protection: Wear NIOSH-approved particulate respirator during bulk handling, especially in poorly ventilated spaces
Skin Protection: Wear chemical-resistant gloves such as nitrile, appropriate lab coat, long sleeves, closed-toe shoes
Eye Protection: Chemical splash goggles or face shield required during transfer, handling, spill cleanup
Other Protection: Emergency eyewash station and safety shower should be accessible in the immediate work area, use dedicated clothing when working with corrosive chemicals
Work Practices: Regular monitoring for exposure, good housekeeping to avoid contamination, training staff on proper use of PPE and response to exposure
Appearance: White or off-white crystalline solid, powdery to slightly granular
Odor: Pungent, distinct sulfonic aroma
Odor Threshold: Not determined
Melting Point: Approximately 90-100°C (dihydrate form begins to lose water above 100°C)
Boiling Point: Not available, decomposition expected before boiling
Solubility: Readily soluble in water, reacts to form acidic solutions
pH (1% Solution): Strongly acidic, pH ≤ 2
Vapor Pressure: Negligible at ambient temperature
Specific Gravity: ~1.3-1.5 (dihydrate, varies slightly by batch)
Partition Coefficient (Log Kow): Data not available, expected low due to ionic functional group
Evaporation Rate: Not applicable, solid at room temperature
Other Properties: Hygroscopic, absorbs moisture from air, forms deliquescent mass if exposed
Chemical Stability: Stable under recommended storage conditions, loses water of hydration on prolonged exposure to air or heat
Conditions to Avoid: Excess humidity, high temperatures, contact with incompatible substances
Materials to Avoid: Strong bases, oxidizing agents, reducing agents, metals susceptible to acid attack
Hazardous Decomposition: Sulfur oxides, volatile aromatic hydrocarbons, toxic vapors during fire or thermal decomposition
Possibility of Hazardous Reactions: Vigorous reaction with strong bases and alkalis, corrosive interactions with some metals
Polymerization: Not anticipated under normal processing conditions
Routes of Exposure: Inhalation of dust, dermal contact, ingestion, eye contact
Acute Effects: Severe irritation or burns to skin and eyes, painful reddening, swelling, possible ulceration, respiratory or gastrointestinal mucosa irritation on inhalation or ingestion
Chronic Effects: Repeated skin contact may cause dermatitis, no evidence for carcinogenic, mutagenic, teratogenic effects in humans based on available data
Toxicity Data: LD50 (oral, rat) estimated > 2,000 mg/kg (limited data, structurally related sulfonic acids show low acute toxicity with corrosive hazards)
Symptoms: Cough, severe eye pain, lachrymation, abdominal pain, vomiting, chemical burns
Medical Conditions Aggravated: Pre-existing skin, respiratory, or eye conditions, asthma, allergies
Sensitization: Not reported as a sensitizer in humans or animals
Other Effects: Corrosiveness accounts for primary hazard, not systemic toxicity
Aquatic Toxicity: Toxic to aquatic life at high concentrations, low to moderate LC50 for freshwater fish and invertebrates, high acidity may damage aquatic organisms by direct pH shift
Persistence and Degradability: Sulfonic acid group is resistant to rapid biodegradation, persists in aerobic conditions but gradually breaks down in environment
Bioaccumulative Potential: Low for parent compound, strong water solubility and tendency to ionize limits bioaccumulation in aquatic organisms
Mobility in Soil: High due to water solubility, risk of leaching into groundwater if large quantities released
Other Adverse Effects: Spills into surface water may lower pH acutely, disrupt ecological balance, warrants containment and local reporting
Waste Treatment Methods: Small laboratory quantities should be diluted and neutralized under controlled conditions, larger volumes handled as hazardous waste by licensed facility
Product Disposal: Follow local, regional, and national regulations for corrosive organic acids, collect in sealed, labeled containers, do not discharge to sewer untreated
Contaminated Packaging: Rinse thoroughly, dispose as hazardous waste due to residue hazard
Precautions: Use chemical-resistant gloves and goggles when handling waste or contaminated packaging, avoid splashing and direct skin contact, document disposal in chemical inventory log
UN Number: 2585 for Benzenesulfonic Acid, Solid or related derivatives
Proper Shipping Name: Benzenesulfonic Acid, Solid
Transport Hazard Class: 8 (Corrosive substances)
Packing Group: III (moderate danger)
Labels Required: Corrosive label for all packaging
Special Precautions: Ensure containers are sealed, upright, and immobilized during transport, emergency information must accompany shipment
Environmental Hazards: Not classified as marine pollutant but still warrants spill prevention measures in transit
Transport Notes: Check for additional local and carrier-specific restrictions or notification requirements
Global Inventory Status: Listed on most major chemical inventories such as TSCA (US), EINECS (Europe), DSL (Canada), ENCS (Japan)
OSHA Regulations: Not specifically regulated, general industry requirements for hazardous chemicals apply
SARA Title III: Not listed as a Section 313 chemical
California Proposition 65: Not known to contain chemicals listed as carcinogens or reproductive toxins
WHMIS Classification: D2B – Toxic (skin/eye irritant), E – Corrosive material
EU Classification: Corrosive (C), hazard statements for burns and severe damage
Labeling Requirements: Signal word: DANGER, hazard and precautionary statements required on all packaging
Other Agreements: Use and disposal must comply with regional environmental and chemical safety laws, workplace training required under hazard communication standards
