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Mixed Butene Isomers (C4 Raffinate)

C4 raffinate stream containing 1-butene, 2-butene (cis/trans), and isobutene, classified as butene isomers under HTS 2901.23.00.00 when meeting purity standards.

Import Duty Rates by Country of Origin

Origin CountryMFN RateCh.99 SurchargesTotal Effective Rate
🇨🇳ChinaFree+37.5%37.5%
🇲🇽MexicoFree+10.0%10%
🇨🇦CanadaFree+10.0%10%
🇩🇪GermanyFree+10.0%10%
🇯🇵JapanFree+12.5%12.5%

Alternative Classifications

This product could be classified differently depending on its characteristics or intended use.

2710.19Lower: 19.5% vs 37.5%

If higher aromatic content

Petroleum distillates with aromatics classified in Chapter 27.

3824Lower: 17.5% vs 37.5%

If fatty acid derivatives present

Mixtures with other functions become preparations.

Not sure which classification is right?

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Import Tips & Compliance

• Detailed GC composition report required showing butene dominance (>90%)

• ISO tank documentation must specify exact isomer breakdown

• Monitor butadiene content (<50ppm) to avoid 2901.24 reclassification

Related Products under HTS 2901.23.00.00

1-Butene (But-1-ene)

1-Butene is a colorless, flammable acyclic unsaturated hydrocarbon with the formula CH2=CH-CH2-CH3, classified under HTS 2901.23.00.00 as a pure isomer of butene. It serves as a key monomer in producing linear low-density polyethylene (LLDPE) and other polymers.

cis-2-Butene

cis-2-Butene is the cis isomer of 2-butene, an acyclic alkene with formula CH3-CH=CH-CH3, falling under HTS 2901.23.00.00 for butene isomers. It is used in organic synthesis and as a research chemical.

trans-2-Butene

trans-2-Butene, the trans stereoisomer of 2-butene (CH3-CH=CH-CH3), is a separate chemically defined compound under HTS 2901.23.00.00. Commonly used in petrochemical research and isomerization studies.

Isobutene (2-Methylpropene)

Isobutene, or 2-methylpropene (CH2=C(CH3)2), is a branched butene isomer classified under HTS 2901.23.00.00 as an acyclic unsaturated hydrocarbon. Primary use is in manufacturing methyl tert-butyl ether (MTBE) and polyisobutylene.

1,3-Butadiene (refined isomer)

While primarily under 2901.24, highly purified 1,3-butadiene can be considered a butene-related diene isomer under HTS 2901.23.00.00 when specified as such. Used exclusively for synthetic rubber (SBR) production.

2-Butene Industrial Grade

Industrial 2-butene (mixed cis/trans isomers) is a chemically defined butene mixture under HTS 2901.23.00.00, used in solvent production and alkylation processes.