p-Toluenesulfonic Acid
p-Toluenesulfonic acid (PTSA) is a strong organic acid with the formula CH3C6H4SO3H, featuring a sulfonated aromatic hydrocarbon structure (toluene derivative). It falls under HTS 2904.99.47.00 as a sulfonated derivative of an aromatic hydrocarbon, used primarily as a catalyst in esterification and dehydration reactions.
Import Duty Rates by Country of Origin
Alternative Classifications
This product could be classified differently depending on its characteristics or intended use.
If derived from benzene without toluene methyl group
Pure benzenesulfonic acid derivatives classify under the specific benzene subheading earlier in 2904.
If imported as formulated catalyst mixture with additives
Mixtures exceeding simple chemical definitions move to Chapter 38 prepared chemical preparations.
If classified by primary catalytic function rather than chemical structure
Certain saturated acyclic monocarboxylic acids used as catalysts fall under oxygen-function headings.
Not sure which classification is right?
The Tariff Assistant works through the GRI rules on your specific product to reach the right HTS code — and can price the duty on it in the same conversation.
Import Tips & Compliance
• Provide detailed chemical composition and purity certificates to verify classification as a sulfonated aromatic derivative
• Ensure proper hazardous material labeling and shipping papers per DOT and IATA regulations for corrosive acids
• Avoid misclassification as a simple sulfonic acid by confirming aromatic hydrocarbon base structure
Related Products under HTS 2904.99.47.00
Benzenesulfonic Acid
Benzenesulfonic acid is a sulfonated derivative of benzene (C6H5SO3H), a key intermediate in dye and detergent production. Classified under HTS 2904.99.47.00 as an 'other' aromatic sulfonated hydrocarbon derivative not specified elsewhere in heading 2904.
Nitrotoluene (Mixture of Isomers)
Nitrotoluene consists of ortho-, meta-, and para-nitrotoluene isomers (CH3C6H4NO2), nitrated derivatives of toluene. Falls under HTS 2904.99.47.00 as aromatic nitrated hydrocarbons, used in explosives, dyes, and pharmaceutical intermediates.
Dodecylbenzenesulfonic Acid
Dodecylbenzenesulfonic acid (DDBSA) is an alkylbenzene sulfonated derivative used as a surfactant in detergents. Classified in HTS 2904.99.47.00 as a sulfonated aromatic hydrocarbon, whether halogenated or not, covering alkyl chain variants.
2,4-Dinitrotoluene
2,4-Dinitrotoluene (2,4-DNT) is a dinitrated toluene derivative used in polyurethane production and as explosive intermediate. It qualifies under HTS 2904.99.47.00 as a nitrated aromatic hydrocarbon derivative.
Dinonylnaphthalenesulfonic Acid
Dinonylnaphthalenesulfonic acid (DNNSA) is a branched alkyl naphthalene sulfonate used in oil additives and extractants. Falls under HTS 2904.99.47.00 as an aromatic sulfonated hydrocarbon derivative.
Nitrobenzene
Nitrobenzene (C6H5NO2) is the simplest nitrated aromatic hydrocarbon, used in aniline production and as solvent. Classified under HTS 2904.99.47.00 as an 'other' nitrated aromatic hydrocarbon.