Butan-2-ol

C4H10O

butan-2-ol

CAS78-92-2
GHS02 Gefahrensymbol: Entzündbar – Flamme
GHS07 Gefahrensymbol: Gesundheitsschädlich/Reizend – Ausrufezeichen
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Identification

CAS Number
78-92-2
EC Number
201-158-5
UN Number
1120
Index Number
603-127-00-5
PubChem CID
6568

Physical-chemical properties

Molecular Formula
C4H10O
Molar Mass
74.12 g/mol
IUPAC Name
butan-2-ol

Chemical Identifiers

InChI
InChI=1S/C4H10O/c1-3-4(2)5/h4-5H,3H2,1-2H3
InChI Key
BTANRVKWQNVYAZ-UHFFFAOYSA-N

Overview

Butan-2-ol (CAS 78-92-2) is a secondary alcohol with moderate flammability and solvent properties used in industrial applications. This branched-chain alcohol, also known as sec-butanol, represents an important industrial solvent and chemical intermediate in various manufacturing processes. With its molecular formula C4H10O and molecular weight of 74.12 g/mol, butan-2-ol exhibits characteristic properties of secondary alcohols while maintaining good solubility characteristics for both polar and moderately nonpolar substances. The compound is classified under GHS as a Category 3 flammable liquid with eye irritation potential and specific target organ toxicity, requiring appropriate handling protocols in industrial environments. Its ADR Class 3 classification reflects its flammable nature, necessitating proper storage and transportation procedures. The warning signal word and associated pictograms GHS02 and GHS07 indicate the need for standard industrial safety measures during handling and use. Butan-2-ol finds primary applications as a solvent in coating formulations, where its moderate evaporation rate and good solvency power make it valuable for paint and lacquer systems. The chemical industry also utilizes it as an intermediate in the synthesis of various esters and ethers. Additionally, it serves in cleaning formulations and degreasing applications, often alongside other solvents like 1,4-xylene in specialized industrial cleaning solutions. Its properties also make it suitable for use in certain adhesive formulations where controlled volatility is required. Similar to other industrial alcohols and solvents such as 4-methoxy-4-methylpentan-2-one, butan-2-ol requires careful handling to ensure workplace safety and environmental compliance. OYSI maintains reliable supplies of technical-grade butan-2-ol to support various industrial applications across European markets.

Safety & Classification

Warning
Classification:

Flam. Liq. 3; STOT SE 3; STOT SE 3; Eye Irrit. 2

HHazard Statements (H-Statements)

Describe the nature and severity of the hazard

H226

Flammable liquid and vapour.

H335

May cause respiratory irritation.

H336

May cause drowsiness or dizziness.

H319

Causes serious eye irritation.

Classification according to CLP Regulation (EC) No 1272/2008. The complete list of hazard and precautionary statements can be found in the Safety Data Sheet (SDS).

First Aid Measures

Inhalation

Irritant

Measures if vapours or dust are inhaled

First Aid Actions

  • +P304IF INHALED:
  • +P340Remove person to fresh air and keep comfortable for breathing.
  • +P311Call a POISON CENTER/doctor.

Related hazard statements:

Eye Contact

Irritant

Measures if substance gets into the eyes

First Aid Actions

  • +P305IF IN EYES:
  • +P351Rinse cautiously with water for several minutes.
  • +P338Remove contact lenses, if present and easy to do. Continue rinsing.
  • +P313Get medical advice/attention.

Related hazard statements:

General Measures

Emergency 112 | Poison Control: +49 30 19240 (DE), +33 1 45 42 59 59 (FR), +31 30 274 88 88 (NL)

First aid measures are based on CLP classification and associated P-statements. They do not replace the Safety Data Sheet (SDS). In case of emergency, always consult the full SDS and a physician.

Transport (ADR)

UN Number1120
ADR Class3
Packing GroupII
Tunnel CodeD/E
Proper Shipping Namesec-Butanol, Flp. < 23 °C, Sdb. > 35 °C
Marine PollutantNo

Frequently Asked Questions

What is butan-2-ol?

Butan-2-ol is a secondary alcohol with the molecular formula C4H10O and CAS number 78-92-2. It is an organic compound with a molecular weight of 74.12 g/mol, also known as sec-butanol or 2-butanol. This colorless liquid belongs to the butanol family and is characterized by its hydroxyl group (-OH) attached to the second carbon atom of the butane chain, distinguishing it from other butanol isomers.

What are the physicochemical properties of butan-2-ol?

Butan-2-ol is a colorless liquid at room temperature with a characteristic alcoholic odor. It has moderate solubility in water due to its hydroxyl group, while being miscible with most organic solvents. The compound has a boiling point around 99°C and a flash point of approximately 24°C, making it classified as a flammable liquid. Its density is lower than water, and it exhibits typical properties of secondary alcohols including hydrogen bonding capabilities.

What is butan-2-ol used for?

Butan-2-ol is primarily used as a solvent in industrial applications, particularly in the production of lacquers, enamels, and synthetic resins. It serves as an intermediate in chemical synthesis for manufacturing other organic compounds and pharmaceuticals. The compound is also utilized in the formulation of cleaning agents, degreasers, and as a coupling agent in various industrial processes. Additionally, it finds application in the production of plasticizers and as a component in some specialty chemical formulations.

How to handle butan-2-ol safely?

Butan-2-ol requires careful handling due to its flammable nature and potential health effects. Always wear appropriate personal protective equipment including chemical-resistant gloves, safety goggles, and protective clothing. Ensure adequate ventilation to prevent vapor accumulation and avoid ignition sources. The compound can cause eye irritation and specific target organ toxicity, so minimize direct contact and inhalation. Work in well-ventilated areas or use local exhaust ventilation to control exposure levels.

How to store butan-2-ol correctly?

Butan-2-ol must be stored in a cool, dry, well-ventilated area away from heat sources, sparks, and open flames due to its flammable properties. Use appropriate containers made of compatible materials and ensure they are tightly sealed to prevent vapor release. Store away from incompatible materials such as strong oxidizing agents and acids. Maintain storage temperatures below the flash point and implement proper fire prevention measures including appropriate fire suppression systems in storage areas.

What to do in case of contact with butan-2-ol?

Immediate action is required following butan-2-ol contact. For skin contact, remove contaminated clothing and wash the affected area thoroughly with soap and water for at least 15 minutes. In case of eye contact, flush immediately with clean water for at least 15 minutes and seek medical attention due to its eye irritant properties. If inhaled, move the person to fresh air immediately. For ingestion, do not induce vomiting and seek immediate medical attention while providing the safety data sheet to medical personnel.

How to dispose of butan-2-ol appropriately?

Butan-2-ol disposal must comply with local and national waste regulations as it is classified as hazardous waste. Never dispose of it down drains or into the environment. Collect waste in appropriate containers for hazardous chemical waste and arrange disposal through licensed waste management companies. Small quantities can be treated through approved solvent recovery programs. Always consult local environmental authorities for specific disposal requirements and maintain proper documentation for waste tracking and regulatory compliance.

How to transport butan-2-ol?

Butan-2-ol is classified as ADR Class 3 (flammable liquids), Packing Group II, requiring specific transport regulations compliance. It must be packaged in UN-approved containers with proper labeling including GHS02 and GHS07 pictograms and 'Warning' signal word. Transport vehicles must carry appropriate emergency equipment and documentation. Drivers require ADR training certification, and transport must follow designated routes with restricted tunnel categories. Proper shipping documentation and emergency response information must accompany all shipments.

Is butan-2-ol subject to specific regulations?

Butan-2-ol is subject to various European regulations including REACH registration requirements and CLP classification as Flam. Liq. 3, STOT SE 3, and Eye Irrit. 2. It is not currently listed as a Substance of Very High Concern (SVHC) under REACH. Companies must comply with safety data sheet requirements, workplace exposure limits, and proper hazard communication. Industrial users must implement appropriate risk management measures and may need to register uses under REACH depending on tonnage and application.

Where to buy butan-2-ol in Europe?

OYSI is a reliable European distributor of butan-2-ol, offering high-quality chemical products to industrial customers across Europe. As an established chemical distributor, OYSI provides comprehensive technical support, regulatory compliance documentation, and reliable supply chain management. European customers can contact OYSI for product availability, technical specifications, and competitive pricing. The company ensures proper packaging, labeling, and transport compliance for safe delivery of butan-2-ol to various industrial applications throughout the European market.

Data Sources

Classification per CLP Regulation (EC) No 1272/2008. Data from ECHA and PubChem.