Benzenesulfonic Acid
Benzenesulfonic acid is the simplest aromatic sulfonic acid, derived from benzene hydrocarbon through sulfonation. Classified under HTS 2904.99.50.00 as a sulfonated derivative of hydrocarbons in the 'other' subcategory. Used in manufacturing detergents, dyes, and pharmaceuticals.
Import Duty Rates by Country of Origin
Alternative Classifications
This product could be classified differently depending on its characteristics or intended use.
If nitrobenzene sulfonic acid derivatives
Nitrated sulfonated hydrocarbons classified earlier in 2904.20 per chapter note on numerical order precedence.
If sulfuric acid esters of phenols rather than true sulfonic acids
Chemical structure determines classification; esters go to different subheading within 2904.
If personal effects or research samples under de minimis
Small quantities for personal/scientific use may qualify for duty-free entry under Chapter 98.
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Import Tips & Compliance
• Submit Certificate of Analysis verifying >98% purity to distinguish from mixtures classifiable in Chapter 38
• Declare proper UN number (UN 2796) and pack in compatible HDPE/PTFE containers to prevent reaction with metals
• Avoid common pitfall of incorrect Chapter 28 classification by providing structural formula showing direct C-S bond
Related Products under HTS 2904.99.50.00
p-Toluenesulfonic Acid
p-Toluenesulfonic acid (PTSA) is a sulfonated derivative of toluene, a hydrocarbon, containing a sulfonic acid group (-SO3H) attached to the aromatic ring. It falls under HTS 2904.99.50.00 as a sulfonated derivative of hydrocarbons, whether or not halogenated, specifically in the 'other' category. Commonly used as a catalyst in organic synthesis and esterification reactions.
Dinonylnaphthalenesulfonic Acid
Dinonylnaphthalenesulfonic acid (DNNSA) features two nonyl alkyl chains on sulfonated naphthalene, qualifying as alkylated sulfonated hydrocarbon derivative under HTS 2904.99.50.00. Widely used in alkylation catalysts and metal extraction.
Xylenesulfonic Acid Mixture
Xylenesulfonic acid mixture contains isomers of dimethylbenzenesulfonic acid from sulfonation of commercial xylene feedstock. Falls under HTS 2904.99.50.00 as sulfonated derivatives not elsewhere specified. Used in hydrotropes and polymerization catalysts.
Camphorsulfonic Acid
10-Camphorsulfonic acid derives from sulfonation of camphor (bicyclic hydrocarbon terpene). Classified HTS 2904.99.50.00 as sulfonated cyclic hydrocarbon derivative. Chiral resolving agent in asymmetric synthesis.
Anthracene-2-Sulfonic Acid
Anthracene-2-sulfonic acid from sulfonation of anthracene polycyclic hydrocarbon. HTS 2904.99.50.00 covers this higher PAH sulfonated derivative. Used in specialty dye synthesis.
Dodecylbenzenesulfonic Acid
Linear dodecylbenzenesulfonic acid (LABSA) from sulfonation of dodecylbenzene alkylaromatic hydrocarbon. HTS 2904.99.50.00 classification for long-chain sulfonated derivatives. Primary raw material for LAS detergents.