But-1-ene

C4H8

but-1-ene

CAS106-98-9

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Identification

CAS Number
106-98-9
EC Number
203-449-2
UN Number
1012
Index Number
601-012-00-4
PubChem CID
7844

Physical-chemical properties

Molecular Formula
C4H8
Molar Mass
56.11 g/mol
IUPAC Name
but-1-ene

Chemical Identifiers

InChI
InChI=1S/C4H8/c1-3-4-2/h3H,1,4H2,2H3
InChI Key
VXNZUUAINFGPBY-UHFFFAOYSA-N

Overview

But-1-ene (CAS 106-98-9) is an alkene hydrocarbon with a terminal double bond and gaseous state at room temperature. But-1-ene, also known by its IUPAC name but-1-ene, is a linear alkene belonging to the olefin family of hydrocarbons. With the molecular formula C4H8 and a molecular mass of 56.11 g/mol, this compound features a characteristic terminal double bond between the first and second carbon atoms in its four-carbon chain. This structural arrangement classifies it as an alpha-olefin, distinguishing it from its structural isomers such as but-2-ene and isobutene. As a colorless gas under standard conditions, but-1-ene exhibits typical properties of lower alkenes, including high reactivity due to its unsaturated nature. The compound is classified under ADR Class 2 for transportation purposes, reflecting its gaseous state and associated handling requirements. Unlike more hazardous industrial gases such as nitrous oxide, but-1-ene presents relatively manageable safety considerations when properly handled according to established protocols. The primary industrial applications of but-1-ene center around polymer production, where it serves as a comonomer in the manufacture of linear low-density polyethylene (LLDPE) and other specialized polymers. Additionally, it functions as an important intermediate in the production of various chemicals including butanol, butyraldehyde, and other C4 derivatives through processes such as hydroformylation and oxidation reactions. The petrochemical industry also utilizes but-1-ene in alkylation processes for fuel additive production. The terminal double bond in but-1-ene makes it particularly valuable for polymerization reactions, where it can be incorporated to control polymer properties such as flexibility and crystallinity. This characteristic enables its use in producing high-performance plastics for packaging, automotive, and construction applications. OYSI maintains reliable supply capabilities for but-1-ene to support diverse industrial applications across European markets.

Safety & Classification

No Hazard Classification

This substance is not classified as hazardous according to CLP Regulation (EC) No 1272/2008.

Transport (ADR)

UN Number1012
ADR Class2
Packing Group
Tunnel CodeB/D
Proper Shipping NameBut-1-en, unter Druck verflüssigt
Marine PollutantNo

Frequently Asked Questions

What is but-1-ene?

But-1-ene is an alkene hydrocarbon with the molecular formula C4H8 and CAS number 106-98-9. It belongs to the family of terminal olefins, featuring a double bond at the first carbon position. With a molecular weight of 56.11 g/mol, this organic compound serves as an important building block in petrochemical processes and polymer production.

What are the physicochemical properties of but-1-ene?

But-1-ene is a colorless gas at room temperature with a characteristic sweet odor. It has a boiling point of -6.3°C and a melting point of -185.3°C. This alkene is practically insoluble in water but readily soluble in organic solvents like alcohols and ethers. It exhibits typical alkene reactivity due to its C=C double bond.

What is but-1-ene used for?

But-1-ene serves primarily as a comonomer in the production of linear low-density polyethylene (LLDPE) and high-density polyethylene (HDPE). It is also used in the synthesis of various chemicals including butanol, maleic anhydride, and as a starting material for producing other specialty chemicals in petrochemical and polymer industries.

How to handle but-1-ene safely?

But-1-ene requires careful handling as a flammable gas. Use appropriate personal protective equipment including safety glasses, gloves, and flame-resistant clothing. Ensure adequate ventilation to prevent accumulation of vapors. Keep away from ignition sources, hot surfaces, and oxidizing agents. Use gas-tight equipment and connections to prevent leaks during transfer operations.

How to store but-1-ene correctly?

But-1-ene should be stored in properly designed pressure vessels in cool, well-ventilated areas away from heat sources and direct sunlight. Storage areas must be equipped with gas detection systems and fire suppression equipment. Keep containers upright and secure to prevent tipping. Avoid storage near oxidizing agents and ensure regular inspection of storage equipment.

What to do in case of contact with but-1-ene?

But-1-ene exposure primarily occurs through inhalation since it's a gas at normal conditions. In case of inhalation, immediately move the affected person to fresh air and keep them at rest. If breathing difficulties occur, provide oxygen and seek immediate medical attention. For skin contact with liquid form, remove contaminated clothing and flush with water.

How to dispose of but-1-ene appropriately?

But-1-ene disposal must comply with local environmental regulations and waste management requirements. Small quantities can be carefully vented in well-ventilated areas away from ignition sources, following local air emission standards. Larger quantities should be recovered or disposed of through licensed waste management companies specializing in flammable gas handling and treatment.

How to transport but-1-ene?

But-1-ene is classified under ADR Class 2 as a flammable gas for transportation purposes. It must be transported in approved pressure containers designed for gas transport, properly labeled with appropriate hazard placards. Transport vehicles require proper ventilation, fire extinguishing equipment, and compliance with dangerous goods transportation regulations throughout Europe.

Is but-1-ene subject to specific regulations?

But-1-ene is subject to standard chemical regulations under REACH and CLP frameworks in Europe. It is not classified as a Substance of Very High Concern (SVHC) and currently has no specific GHS classification requiring hazard pictograms or signal words. However, standard industrial chemical handling and environmental protection regulations apply.

Where to buy but-1-ene in Europe?

But-1-ene is available through OYSI, a European distributor of technical chemicals serving industrial customers across the continent. As a specialized chemical distributor, OYSI can provide but-1-ene with appropriate documentation and technical support for industrial applications. Contact OYSI directly for availability, specifications, and delivery options in your region.

Data Sources

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