Cis-2-Butene

Cis-2-Butene is a high-purity C4 olefin with the molecular formula C4H8 and CAS No. 590-18-1, characterized by a carbon-carbon double bond in the cis configuration. As an important member of the butene family, cis-2-butene is supplied as a colorless, highly flammable hydrocarbon and is primarily used as an industrial chemical feedstock. Its controlled molecular structure, volatility, and reactivity make it suitable for applications requiring a consistent C4 olefin composition. Commercial cis-2-butene is generally produced and recovered from C4 hydrocarbon streams generated during petroleum refining, steam cracking, and related petrochemical operations. The production process typically includes separation of the C4 fraction, removal of impurities, selective separation or isomerization of butene isomers, and final purification to achieve the required specification. Advanced fractionation and purification technologies can provide grades suitable for chemical manufacturing and other specialized industrial applications.

Cis-2-Butene is commercially used in the production of methyl ethyl ketone (MEK) through controlled oxidation processes and can serve as a feedstock for other downstream C4 chemicals. It is also used in olefin conversion, alkylation, metathesis, polymer-related processes, and specialty chemical manufacturing where a reactive internal olefin is required. Available commercial types may include standard industrial grade cis-2-butene, high-purity grade cis-2-butene, and customized specifications based on hydrocarbon composition, purity, sulfur content, moisture, and other trace impurities. Standard industrial grades are suitable for general petrochemical and chemical processing, while high-purity grades are preferred for applications where feedstock consistency and low impurity levels are critical. Depending on the customer’s process requirements, suppliers can provide cis-2-butene in specified purity ranges and according to agreed technical specifications. Its advantages include good reactivity, predictable chemical behavior, suitability as a C4 feedstock, efficient integration into petrochemical processes, and compatibility with a range of downstream chemical production systems.

For industrial procurement, Cis-2-Butene can be supplied according to required purity, composition, packaging, and transportation conditions. Packaging commonly includes pressurized cylinders, specialized gas containers, ISO tanks, or other approved pressure-rated containers depending on quantity, destination, and supplier specifications. With appropriate quality control, packaging, and logistics, Cis-2-Butene can provide a reliable C4 olefin feedstock for petrochemical manufacturers, chemical processors, and industrial production facilities.

Specification	Typical Value / Description
Product Name	Cis-2-Butene
Chemical Formula	C₄H₈
CAS Number	590-18-1
Molecular Weight	56.11 g/mol
Appearance	Colorless gas/liquid under pressure
Odor	Hydrocarbon-like
Cis Isomer	≥ 95% typical, grade dependent
Boiling Point	Approximately 3.7°C
Melting Point	Approximately -139°C
Hydrocarbon Purity	Grade dependent
Main Application	Petrochemical & chemical feedstock
Packaging	Cylinders, pressure containers, ISO tanks

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FAQ Cis-2-Butene

Cis-2-Butene is mainly used as a C4 olefin feedstock for MEK production, petrochemical processing, olefin conversion, alkylation, metathesis, and specialty chemical manufacturing.

It is commonly recovered from C4 hydrocarbon streams generated during petroleum refining and steam cracking, followed by fractionation, isomer separation, and purification to meet the required commercial specification.

Both have the same molecular formula and carbon skeleton, but their molecular geometries differ around the carbon-carbon double bond, resulting in different physical properties and industrial handling characteristics.

Industrial and high-purity grades are commonly available, with specifications customized according to purity, isomer composition, moisture, sulfur compounds, and other trace impurities.

Because Cis-2-Butene is a highly flammable hydrocarbon, it is normally supplied in approved pressure-rated cylinders, specialized gas containers, or ISO tanks under appropriate hazardous-material transportation requirements.

For sourcing Cis-2-Butene from Iran, international buyers can contact Irancorps to identify suitable Iranian manufacturers or suppliers based on required purity, quantity, specifications, packaging, and destination.