Product Overview
Isobutylene gas 99.50% (2-Methylpropene) is a highly reactive, branched-chain C4 olefin characterized by its unsaturated double bond on a tertiary carbon. This product specification guarantees a minimum purity of 99.50% isobutylene, making it a premium-grade feedstock for demanding chemical synthesis and polymerization processes. High-purity isobutylene is a critical building block in the petrochemical industry, primarily used to manufacture important polymers and fuel additives. The unique reactivity of its molecular structure makes this specific grade of isobutylene indispensable for producing high-value derivatives with consistent quality.
Basic Information
| CAS No. | 115-11-7 |
| UN No. | UN1055 (Isobutylene) or UN1077 (Refrigerant gas, n.o.s.) |
| Molecular Formula | C₄H₈ (CH₂=C(CH₃)₂) |
| Hazard Classification | 2.1 (Flammable gas) |
Key Attributes & Parameters
| Purity | Minimum 99.50% isobutylene by weight (typically 99.50% - 99.90% range). |
| Key Impurities | n-Butenes (<0.30%), butane (<0.15%), isobutane (<0.10%), water (<10 ppm). |
| Physical State | Colorless, flammable gas; easily liquefied under moderate pressure for storage and transport. |
| Boiling Point | -6.9 °C (19.6 °F) at atmospheric pressure. |
| Critical Properties | Critical temperature |
Features & Advantages
High Tertiary Carbon Reactivity
The double bond on the tertiary carbon atom makes isobutylene exceptionally reactive for cationic polymerization and other acid-catalyzed reactions, enabling efficient production of high molecular weight polymers like butyl rubber.
Premium Chemical Feedstock
The guaranteed minimum 99.50% isobutylene purity ensures optimal performance and yield in sensitive processes such as polyisobutylene (PIB) production and alkylation for high-octane fuel components.
Essential for Specialty Elastomers
Serves as the principal monomer for butyl rubber and halobutyl rubber, which are valued for their superior impermeability to gases and chemical resistance.
Versatile Derivative Platform
Acts as a key precursor for a wide range of chemicals, including antioxidants, fragrances, and specialty octane boosters like ETBE.
Functional Characteristics
High-purity isobutylene functions primarily as a reactive monomer and alkylating agent. Its main functional characteristic is its susceptibility to cationic polymerization at low temperatures in the presence of catalysts like aluminum chloride, leading to polymers such as polyisobutylene and butyl rubber. It also readily undergoes reactions like etherification with methanol to produce MTBE or with ethanol to produce ETBE (fuel oxygenates), as well as hydroformylation and hydration. This product is supplied as a liquefied gas under its own vapor pressure in cylinders, tube trailers, or via dedicated pipelines.
Primary Application Fields
Polymer Production
The primary use is as a co-monomer with isoprene to produce butyl rubber and halobutyl rubber (for tire inner liners, pharmaceutical stoppers). Also used to manufacture high- and low-molecular-weight polyisobutylene (PIB) used in adhesives, lubricants, and fuel additives.
Fuel Additives
Feedstock for producing methyl tert-butyl ether (MTBE) and ethyl tert-butyl ether (ETBE), high-octane gasoline blending components (though MTBE use is declining in some regions).
Chemical Intermediates
Used in the synthesis of tertiary-butanol, neopentanoic acid, antioxidants (e.g., BHT), and fragrances.
Specialty Chemicals
Production of alkylphenols and other derivatives for lubricant and fuel additives.
Customer Collaboration Case
A global manufacturer of halobutyl rubber for pharmaceutical stoppers and high-performance tire inner liners faced yield and consistency challenges. Their production of chlorobutyl rubber required extremely high-purity isobutylene to prevent catalyst poisoning and achieve the precise molecular weight and halogenation levels needed for medical-grade applications. We supplied them with a dedicated stream of our 99.50% minimum isobutylene product, implementing enhanced on-site purification and real-time gas chromatography to guarantee consistent impurity levels, particularly for butadiene and sulfur compounds. This high-purity isobutylene feedstock allowed their cationic polymerization process to run with unprecedented stability, resulting in a 12% increase in production yield and a 50% reduction in off-spec batches. The consistent quality of the rubber produced from our isobutylene enabled them to achieve stringent USP Class VI certification for medical applications and secure a long-term supply agreement with a leading tire manufacturer, demonstrating the critical link between feedstock purity and end-product performance in advanced elastomers.
Heze Dongjian Chemical Sales Co., Ltd. relies on its rich product range and professional technical support to provide customers with comprehensive chemical service solutions. The products cover three core categories: specialty gases (such as carbon monoxide, propargene), LNG refrigerants, and bulk materials (such as ethylene, isopentane), as well as various other products such as lubricants and new energy power equipment, meeting the needs of different industries. The company not only provides product sales and transportation services, but also forms a professional technical team to carry out research and development of biological chemical products, technical consultation, and technology transfer services, adhering to the service concept of "learning for application, application-oriented". Through precise product quotations, professional technical guidance, and efficient delivery services, it forms a full-chain service model of "products + services + technology", providing customers with one-stop chemical services, helping them reduce costs, increase efficiency, and enhance competitiveness.
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