1-Butene

1-Butene is a high-purity, colorless and highly flammable olefin with the molecular formula C₄H₈ and CAS No. 106-98-9, commercially supplied as a liquefied gas or under controlled pressure for use as an important petrochemical feedstock and chemical intermediate. It is a linear alpha-olefin characterized by a terminal double bond, good chemical reactivity and consistent performance in polymerization and industrial synthesis processes. Commercial 1-Butene is normally produced as part of the C4 olefin stream generated during steam cracking of hydrocarbons or catalytic cracking and is subsequently recovered and purified through separation processes such as distillation and selective purification to achieve the required commercial grade. Depending on the intended application, manufacturers can supply different purity levels and specifications, making 1-Butene suitable for polymer production, chemical manufacturing and other specialized industrial applications where controlled olefin composition is required.

A major application of 1-Butene is as a comonomer in the production of polyethylene, particularly linear low-density polyethylene (LLDPE) and certain high-density polyethylene (HDPE) grades, where its incorporation helps control polymer density, crystallinity, flexibility, toughness and processing characteristics. It is also used in the production of poly-1-butene and can serve as a feedstock or intermediate for the manufacture of various chemicals and specialty products. Commercially available types may include polymerization-grade 1-Butene, high-purity 1-Butene and industrial-grade material, with the appropriate grade selected according to polymerization requirements, purity specifications and process conditions. High-purity grades are generally preferred for sensitive polymerization applications because controlled levels of impurities such as water, oxygenates, sulfur compounds and other hydrocarbons can be important for catalyst performance and final polymer quality. The principal advantages of 1-Butene include its high chemical reactivity, suitability as an alpha-olefin comonomer, reliable incorporation into polyethylene chains and ability to contribute to balanced mechanical and processing properties.

1-Butene is commonly supplied in pressure-rated cylinders, tube trailers, ISO tanks or other approved pressurized containers according to the transportation method, destination regulations and customer requirements. Packaging and handling must account for its highly flammable nature, vapor pressure and compatibility with the selected container.

Specification	Typical Value / Description
Chemical Name	1-Butene / 1-Butylene
CAS Number	106-98-9
Molecular Formula	C₄H₈
Molecular Weight	56.11 g/mol
Appearance	Colorless liquefied gas
Odor	Characteristic hydrocarbon odor
Purity	Typically ≥ 95–99.5%, depending on grade
Boiling Point	Approximately -6.3°C
Melting Point	Approximately -185°C
Density	Approximately 0.62 g/cm³ at 20°C (liquid)
Main Application	Polyethylene comonomer and chemical feedstock
Packaging	Cylinders, tube trailers, ISO tanks and approved pressure containers

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FAQ 1-Butene

1-Butene is mainly used as a comonomer in the production of LLDPE and selected HDPE grades, while it is also used for poly-1-butene production and as a feedstock or intermediate in chemical manufacturing.

Commercial 1-Butene is primarily recovered from C4 olefin streams generated through steam cracking or catalytic cracking of hydrocarbon feedstocks, followed by separation and purification to achieve the required commercial specification.

Polymerization-grade 1-Butene generally has tighter limits for impurities such as water, oxygenates and sulfur compounds because catalyst performance and polymer quality can be sensitive to feedstock contamination, while industrial grades may be suitable for less demanding applications.

Because 1-Butene is a highly flammable liquefied gas under pressure, it is normally transported in approved pressure-rated cylinders, tube trailers, ISO tanks or other compliant containers according to applicable dangerous-goods regulations.

Buyers should evaluate purity, C4 hydrocarbon composition, moisture, oxygenates, sulfur compounds and other relevant impurities, together with pressure, packaging, certificate of analysis, origin, quantity and batch consistency.

International buyers can contact Irancorps to identify and communicate with suitable Iranian manufacturers, petrochemical suppliers and exporters of 1-Butene according to the required purity, quantity, packaging, application and export destination.