What is Methyl Isobutyl Carbinol (MIBC)?
Methyl Isobutyl Carbinol (MIBC), also known as 4-methyl-2-pentanol, is a colorless liquid chemical compound with a mild odor. Its chemical formula is C₆H₁₄O, and it has a molar mass of 102.174 g/mol. It is widely used in industrial applications due to its solvent and frothing properties. CAS number: 108-11-2.
What are the physical properties of MIBC?
MIBC is a clear, colorless liquid with a mild odor and low evaporation rate. It has good solubility in oils, waxes, and natural resins.
What are the main uses of MIBC?
MIBC is primarily used as a frother in mineral flotation processes to separate valuable minerals from waste. It also serves as a solvent in brake fluid production, a precursor for plasticizers, and in manufacturing lubricant oil additives like Zinc dithiophosphate. Additionally, it is used in water-based coatings as a coupling solvent and in organic synthesis.
How is MIBC produced?
MIBC is typically produced by reducing mesityl oxide, which is derived from acetone. This process often uses catalysts like platinum or over-reduced copper on asbestos in an acetic acid solution, making it an efficient method for synthesizing MIBC from acetone derivatives.
Is MIBC flammable?
Yes, MIBC is flammable and is classified as a Class II Combustible Liquid. It has a flash point of 106°F (41°C), meaning it should be kept away from heat, sparks, and open flames and stored in cool, well-ventilated areas to avoid fire risks.
What safety precautions should be taken when handling MIBC?
When handling MIBC, you should:
- Wear protective equipment like gloves and eye protection to avoid skin and eye contact.
- Use it in well-ventilated areas to prevent vapor inhalation.
- Store it away from ignition sources.
- Adhere to exposure limits: a Time-Weighted Average (TWA) of 25 ppm and a Short-Term Exposure Limit (ST) of 40 ppm.
- Follow first aid procedures if exposed, such as rinsing affected areas with water and seeking medical help.
What are the health hazards associated with MIBC?
MIBC can cause health issues through inhalation, skin absorption, ingestion, or eye contact. It may irritate the eyes, skin, and respiratory system, leading to symptoms like headaches, drowsiness, dermatitis, or central nervous system effects. Prolonged exposure should be avoided, and protective gear is recommended.
How should MIBC be stored and transported?
MIBC should be stored in tightly closed containers in a cool, ventilated area, away from heat and flames. For transportation, it is classified under UN number 2053 as a flammable liquid (Class 3, Packing Group III), requiring compliance with hazardous materials regulations.
What is the environmental impact of MIBC?
MIBC has moderate toxicity to aquatic life (LC50 of 150 mg/L for rainbow trout over 96 hours) but is readily biodegradable, reducing its long-term environmental harm. Its low water solubility and tendency to adsorb to soil limit its mobility, decreasing the risk of widespread contamination.
How should MIBC be disposed of?
MIBC must be disposed of according to local, state, and federal hazardous waste regulations. Avoid releasing it into waterways, and use methods like incineration or treatment at a licensed facility to ensure proper disposal.
Are there any compatibility issues with MIBC?
Yes, MIBC is incompatible with strong oxidizers, alkali metals, nitrides, and strong reducing agents, as it can produce flammable or toxic gases. It may also react with oxoacids and carboxylic acids to form esters and water, or with oxidizing agents to form aldehydes or ketones, and can initiate polymerization of isocyanates and epoxides.
What are the regulatory standards for MIBC exposure?
OSHA and NIOSH regulate MIBC exposure with a TWA of 25 ppm (100 mg/m³) and an ST of 40 ppm (165 mg/m³). Skin contact precautions are necessary due to absorption risks, ensuring worker safety through compliance with these limits.
What should I do in case of accidental exposure to MIBC?
Eye contact: Flush eyes with water for at least 15 minutes and seek medical attention.
Skin contact: Wash with soap and water immediately.
Inhalation: Move to fresh air and provide respiratory support if needed.
Ingestion: Do not induce vomiting; get medical help right away.
Is MIBC used in any consumer products?
MIBC is mainly an industrial chemical but may appear in trace amounts in products like brake fluids or coatings. It is not typically present in consumer goods at levels that pose a direct risk to the public.
How does MIBC compare to other frothing agents in mineral flotation?
MIBC is preferred in mineral flotation for its ability to create stable froth and its cost-effectiveness. It excels at separating hydrophobic minerals from hydrophilic waste, offering a strong balance of performance and safety compared to other frothers.
What is an interesting or lesser-known fact about MIBC?
A lesser-known fact is that MIBC’s classification under UN number 2053 as a flammable liquid subjects it to strict transportation and disposal rules, a detail critical for safe handling but not widely recognized outside the chemical industry.
