Phenol-4-Sulfonic Acid
4-Hydroxybenzenesulfonic acid is the direct sulfonated phenol containing only sulfo groups, used in dye and pharmaceutical intermediates. Precisely fits HTS 2908.99.1500 definition.
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Alternative Classifications
This product could be classified differently depending on its characteristics or intended use.
If phenol without sulfonation
Parent monophenols classified in heading 2907 before sulfonated derivatives.
If aniline-4-sulfonic acid isomer
Amino-substituted sulfonic acids classified under nitrogen-function amines in heading 2921.
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Import Tips & Compliance
• pH <1 in 1% solution certification; light protection required
• Avoid 'sulfanilic acid' misnomer causing aniline derivative confusion under heading 2921
Related Products under HTS 2908.99.15.00
Sodium Dodecylbenzene Sulfonate
Sodium dodecylbenzene sulfonate is a chemically defined anionic surfactant derived from alkylated benzene with a sulfo group, classified under HTS 2908.99.1500 as a sulfonated derivative of phenols containing only sulfo groups. It is widely used in detergents and emulsifiers due to its excellent foaming and cleaning properties.
Sodium Xylene Sulfonate
Sodium xylene sulfonate (CAS 1300-72-7) is a hydrotrope and coupling agent derived from sulfonation of xylene (dimethylbenzene), a phenolic hydrocarbon, containing only sulfo groups. It falls under HTS 2908.99.1500 as a salt of a sulfonated phenol derivative used in liquid detergents to enhance solubility.
Diisopropyl Naphthalene Sulfonic Acid Sodium Salt
This sulfonated derivative of diisopropylnaphthalene contains only sulfo groups and is used as a dispersant in dyes and agrochemicals. Classified under HTS 2908.99.1500 as it meets the criteria for halogenated/sulfonated phenol derivatives (naphthalene as phenolic).
Camphor Sulfonic Acid
Camphor-10-sulfonic acid is a chiral resolving agent derived from sulfonation of camphor (bicyclic monoterpene phenol), containing only sulfo groups. It qualifies for HTS 2908.99.1500 as a nitrosated/sulfonated derivative of phenol-alcohols used in pharmaceutical synthesis.
Petroleum Sulfonic Acid Sodium Salt
Mahogany sulfonates from sulfonation of petroleum alkylbenzenes (phenolic), containing only sulfo groups, used as emulsifiers in oil drilling. HTS 2908.99.1500 applies to these chemically defined salts not qualifying as mixtures.
Lignin Sulfonate Sodium Salt
Sodium lignosulfonate from sulfite pulping of wood contains phenolic sulfo groups, classified as a sulfonated phenol derivative under HTS 2908.99.1500 when meeting chemical purity standards. Used as binder in concrete and dispersant.