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.
Import Duty Rates by Country of Origin
Alternative Classifications
This product could be classified differently depending on its characteristics or intended use.
If also halogenated (e.g., chlorinated PTSA derivatives)
Halogenated sulfonated derivatives are classified earlier in heading 2904.10, taking precedence over non-halogenated under numerical order rules.
If imported primarily as a sulfonic acid without emphasizing organic hydrocarbon parent structure
Customs may reclassify simple sulfonic acids under inorganic acids of Chapter 28 if organic character not predominant.
If supplied as formulated catalyst mixture with additives exceeding simple compound definition
Mixtures or preparations of chemicals fall under Chapter 38 rather than pure organic compounds of Chapter 29.
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Import Tips & Compliance
• Provide detailed chemical analysis (NMR, IR spectra) confirming sulfonation on hydrocarbon base structure to verify Chapter 29 classification
• Include Material Safety Data Sheets (MSDS) and UN shipping declarations for corrosive properties during customs clearance
• Ensure proper labeling as hazardous material (UN 3261) to avoid delays; verify purity levels as impurities may affect duty rates
Related Products under HTS 2904.99.50.00
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.
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.