butene

Description

butene · CAS 25167-67-3 · C4H8. UNII LY001N554L. Boiling Point: 21 °F at 760 mmHg (NTP, 1992); Boiling Point: -6.47 °C at 760 mm Hg; Boiling Point: -6.3 °C @760 [mm Hg].

Identification

CAS Registry Number	25167-67-3
PubChem CID	7844
Molecular formula	C4H8
IUPAC name	but-1-ene
UNII (FDA)	LY001N554L

Computed Descriptors

Molecular Weight	56.11
XLogP3	2.4
Hydrogen Bond Donor Count	0
Hydrogen Bond Acceptor Count	0
Rotatable Bond Count	1
Exact Mass	56.062600255
Monoisotopic Mass	56.062600255
Topological Polar Surface Area	0
Heavy Atom Count	4
Formal Charge	0

Physical & Chemical Properties

Boiling Point	21 °F at 760 mmHg (NTP, 1992)
Boiling Point	-6.47 °C at 760 mm Hg
Boiling Point	-6.3 °C @760 [mm Hg]
Melting Point	-301.5 °F (NTP, 1992)
Melting Point	-185.33 °C
Melting Point	-185.3 °C
Flash Point	-110 °F (NTP, 1992)
Solubility	In water, 221 mg/L at 25 °C
Density	0.588 g/cu cm at 25 °C, 1 atm
Density	0.557 @25 °C

Physical description & handling notes

• 1-butene is a colorless gas. (NTP, 1992)
• Gas Vapor; Liquid; Liquid; Gas Vapor; Other Solid
• Gas Vapor; Liquid
• Colorless gas
• Slightly aromatic odor
• Gassy, slightly aromatic odor

Regulatory Status

Regulatory & Food Contact	FDA Inventory of Food Contact Substances Listed in 21 CFR: FCS
GHS notification summary	0.1% (2 / 1383)

GHS Hazard Classification

GHS notification summary	0.1% (2 / 1383)
Reported hazard statements	H220, H280 (65.7%), H320, H336

Documented Uses

• /1-Butene/ is used for the production of a wide variety of chemicals in the gasoline and rubber processing industries.
• Most high-purity 1-butene is used as a comonomer for linear low-density polyethylene (LLDPE) and for modifying high-density polyethylene (HDPE), which contains up to 4%.
• COMONOMER FOR HIGH DENSITY POLYETHYLENE FOR BLOW-MOLDING RESINS; MONOMER FOR POLYBUTENE USED IN PLASTIC PIPE & FILM; INT FOR 1,2-BUTYLENE OXIDE
• Not Known or Reasonably Ascertainable
• There are two important sources for the commercial production of butylenes: catalytic or thermal cracking, and steam cracking. In these two processes, butylenes are always produced as by-products. /Butylenes/
• In the Institut Francais du Petrole process, ethylene is dimerized into polymer-grade 1-butene (99.5% purity) suitable for the manufacture of linear low density polyethylene. It uses a homogeneous catalyst system that eliminates some of the drawbacks of heterogeneous catalysts. It also inhibits the isomerization of 1-butene to 2-butene, thus eliminating the need for superfractionation of the product. The process also uses low operating temperatures, 50-608 °C, and pressures.

Synonyms

1-BUTENE; But-1-ene; Ethylethylene; 106-98-9; 1-Butylene; alpha-Butylene; Butene-1; alpha-Butene; LY001N554L; DTXSID1026746; CHEBI:48362; RefChem:6715; DTXCID606746; 203-449-2; BUTENE; 1-Butene-1-13C

Frequently Asked Questions

What are the CAS number and molecular formula of butene?

CAS 25167-67-3; molecular formula C4H8; molecular weight — g/mol.

What other names is butene known by?

1-BUTENE, But-1-ene, Ethylethylene, 106-98-9, 1-Butylene, alpha-Butylene.

What is the regulatory status of butene?

Documented regulatory listings: FDA Inventory of Food Contact Substances Listed in 21 CFR: FCS.

Is butene classified as hazardous?

0.1% of GHS notifications report no hazard classification (2 of 1383).

What are the key physical properties of butene?

Boiling Point: 21 °F at 760 mmHg (NTP, 1992); Boiling Point: -6.47 °C at 760 mm Hg; Boiling Point: -6.3 °C @760 [mm Hg]; Melting Point: -301.5 °F (NTP, 1992).

Facts on this page are taken from PubChem (US National Library of Medicine) and Wikidata. Grade-specific data — assay, moisture, particle size, packaging, shelf life — is issued per batch on the COA and is not published here.