2901.23.00.00 - Butene (Butylene) and isomers thereof

This HTS category, 2901.23.00.00, specifically classifies butene (also known as butylene) and its isomers. Butenes are unsaturated acyclic hydrocarbons containing four carbon atoms, characterized by the presence of at least one carbon-carbon double bond. This classification includes all positional and geometric isomers of butene, such as 1-butene, cis-2-butene, and trans-2-butene, regardless of their purity or intended use.

It is important to distinguish this category from its siblings. Ethylene (2901.21.00.00) and propene (2901.22.00.00) are lower molecular weight unsaturated acyclic hydrocarbons with two and three carbon atoms, respectively. Buta-1,3-diene and isoprene (2901.24) are dienes, meaning they contain two double bonds, distinguishing them from the single double bond characteristic of butenes. Other unsaturated acyclic hydrocarbons not specifically listed are found under the "Other" subcategories.

As a leaf node within the HTS structure, 2901.23.00.00 does not have further subdivisions. Therefore, classification within this code is definitive for butene and its isomers. Typical applications for these compounds include their use as monomers in the production of polymers like polybutene, as intermediates in the synthesis of other organic chemicals, or as components in fuel mixtures. Proper identification based on chemical analysis and product documentation is crucial for accurate classification.