Product Name: N-Methylimidazolium Hydrogen Sulfate
Chemical Formula: C4H8N2·HSO4
Synonyms: 1-Methylimidazolium hydrogen sulfate; Ionic Liquid
Recommended Use: Laboratory chemicals, research, synthesis catalyst
Manufacturer: Available from specialty chemical suppliers
Emergency Phone Number: Provided by supplier upon purchase
Contact Email: Provided by supplier upon purchase
CAS Number: 262297-13-2
Address: Available through distributor order documentation
Classification: Corrosive to metals, Skin irritation, Eye damage
GHS Label Elements: Danger symbol, Corrosive pictogram, Signal word: Danger
Hazard Statements: Causes severe skin burns and eye damage, Harmful if swallowed
Precautionary Statements: Avoid breathing vapors, Wash skin thoroughly after handling, Wear protective gloves and eye protection
Main Hazards: Acid burns, Toxic by ingestion, Environmental hazard in high quantities
Potential Health Effects - Eyes: Severe irritation, Redness, Possible vision impairment
Potential Health Effects - Skin: Burns, Irritation, Blistering
Potential Health Effects - Inhalation: Irritation of respiratory tract, Coughing
Potential Health Effects - Ingestion: Gastrointestinal tract injury, Nausea, Vomiting, Pain
Note: No evidence for carcinogenicity in standard tests, but data incomplete
Chemical Name: N-Methylimidazolium Hydrogen Sulfate
Concentration: >98% pure
Impurities: Trace amounts of imidazole, sulfuric acid possible
CAS Registry Number: 262297-13-2
EC Number: Not officially assigned
Molecular Weight: 174.19 g/mol
Relevant Identified Uses: Used as a solvent, ionic liquid, catalyst in organic chemistry
Incompatible Substances: Strong oxidizers, strong bases
General Advice: Move victim away from exposure source immediately, consult physician, provide MSDS
Eye Contact: Rinse eyes gently with water for at least 20 minutes, hold eyelids apart, seek immediate medical attention
Skin Contact: Remove contaminated clothing, rinse skin under water for at least 15 minutes, get medical help for burns
Inhalation: Remove person to fresh air, administer oxygen if needed, seek medical attention if symptoms persist
Ingestion: Do not induce vomiting, rinse mouth with water, provide water to drink if conscious, call poison control or physician immediately
Symptoms of Exposure: Burning, difficulty breathing, vomiting, skin blisters
Medical Attention: Essential for eye contact, severe burns, or if feeling unwell after exposure
Suitable Extinguishing Media: Water spray, dry chemical, foam, carbon dioxide
Unsuitable Media: Direct water jet on burning liquid
Fire Hazards: Material does not ignite easily, emits sulfur oxides and nitrogen oxides at high temperatures
Special Protective Equipment: Wear self-contained breathing apparatus, full protective gear
Special Procedures: Contain water runoff, prevent entry to sewers or waterways
Decomposition Products: Sulfur oxides, carbon oxides, nitrogen oxides
Flash Point: Data not available due to ionic liquid properties, may not form flammable vapors under normal conditions
Personal Precautions: Wear gloves, chemical goggles, face shield, lab coat or protective clothing
Environmental Precautions: Do not let product enter drains, water courses, or soil
Containment Methods: Use inert absorbent material (vermiculite, sand), scoop up and place in appropriate chemical waste container
Clean-Up Procedures: Wash spill area with water after material pick-up, ensure adequate ventilation
Emergency Procedures: Evacuate area if large spill, ventilate as much as possible, contact emergency services for uncontrolled releases
Special Risk: Spillage can cause slippery surfaces, increases risk of acid burns
Handling: Use only in well-ventilated areas, avoid contact with skin or eyes, wash hands after handling
Storage Recommendations: Store in closed, leak-proof containers, corrosion-resistant shelving
Storage Temperature: Ambient conditions, away from heat sources or direct sunlight
Storage Location: Locked, labeled chemical cabinet, segregate from strong bases or oxidizers
Hygiene Measures: Do not eat/drink/smoke near chemicals, always label containers clearly
Incompatibilities: Avoid contact with metals, bases, oxidizing agents
Exposure Limits: Not established for this compound, adhere to good laboratory practice
Engineering Controls: Chemical fume hood strongly recommended, eyewash station and safety shower
Personal Protective Equipment (PPE): Chemical splash goggles, gloves (nitrile or neoprene), long-sleeved laboratory coat or apron
Respiratory Protection: Use a NIOSH/MSHA-approved respirator if ventilation is inadequate or exposure risk rises
Environmental Exposure Controls: Do not discharge into drains or environment, collect and dispose according to regulations
Monitoring: Regular checks of workplace air if handling large quantities
Appearance: Colorless to pale yellow viscous liquid
Odor: Faint, slightly sulfurous odor
pH: Acidic (estimated pH 1-2 in water solution)
Melting Point: <25°C
Boiling Point: Decomposes before boiling
Flash Point: Not measurable in standard tests for ionic liquids
Solubility: Completely miscible with water
Vapor Pressure: Negligible
Vapor Density: Data not available
Relative Density: 1.18 – 1.22 g/cm³ (20 °C)
Partition Coefficient (n-octanol/water): Not measured
Viscosity: High compared to water and most organic solvents
Decomposition Temp: Above 150°C, with release of sulfur oxides and nitrogen oxides
Chemical Stability: Stable under standard laboratory conditions
Conditions to Avoid: Excessive heating, contact with strong bases, metals, oxidizing materials
Incompatible Materials: Metals (corrosive), strong oxidizers, strong bases, cyanides
Hazardous Decomposition Products: Sulfur oxides, nitrogen compounds, imidazole derivatives
Polymerization: Not reported to occur
Thermal Decomposition: Can produce toxic gases if overheated
Likely Routes of Exposure: Skin, eyes, inhalation, ingestion
Acute Toxicity: Data sparse, estimated moderate by analogy with similar ionic liquids
Skin Corrosion/Irritation: Definite risk, with development of burns on contact
Eye Damage/Irritation: High risk of severe damage
Respiratory Irritation: Exposure to vapor or mist may cause coughing, shortness of breath
Germ Cell Mutagenicity: Not known, insufficient data
Carcinogenicity: No listings with IARC, ACGIH, NTP, OSHA
Long-Term Effects: Prolonged contact can lead to dermatitis, sensitization rare
Symptoms: Redness, blistering, pain if direct contact, nausea and vomiting if ingested
Eco-Toxicity: No detailed studies, estimated harmful to aquatic life based on related ionic liquids
Mobility in Soil: High water solubility, likely mobile, risk of groundwater contamination
Persistence & Degradability: Not readily biodegradable, may persist in environment
Potential Bioaccumulation: Low expected
Other Adverse Effects: Lower pH of water bodies, harm aquatic organisms and plants
Precaution: Prevent release to soil, surface water, sewer systems
Disposal Methods: Chemical waste contractor, do not pour into drains
Container Disposal: Triple rinse, puncture and send to certified recycler
Contaminated Packaging: As above, handle with gloves and eye protection
Legal Requirements: Follow local, national, and international chemical waste regulations
Burning/Incineration: Only with appropriate air pollution controls, due to release of sulfur oxides
Spill Residues: Collect using inert absorbent, treat as hazardous waste
UN Number: Not assigned for small quantities; treat as corrosive liquid for large containers
Proper Shipping Name: Corrosive liquid, organic, n.o.s. (N-Methylimidazolium hydrogen sulfate)
Hazard Class: 8 (Corrosive Substances)
Packing Group: II or III, depending on concentration
Label Required: Corrosive
Transport Precautions: Seal containers tightly, label clearly, keep apart from foodstuffs
Special Provisions: Local regulations may require special documentation for transport
Environmental Hazards: Marine pollutant in bulk quantities, notify authorities in case of accidental release
EU Regulations: Classified as hazardous under Regulation (EC) No 1272/2008 (CLP/GHS)
US Federal Regulations: SARA 313: Not listed; TSCA: Not routinely listed, check import status
Labeling Requirements: Corrosive pictogram, risk and safety phrases as required
Hazard Statements: H314: Causes severe skin burns and eye damage
Precautionary Statements: P260, P264, P280, P305+P351+P338, P301+P330+P331, P310
Other National Regulations: Subject to local workplace safety, fire, and environmental legislation
Industry Standards: Laboratory, university, and industrial users provide site-specific risk assessments and control measures; safety training, PPE, and emergency plans recommended for frequent users
