3-Amino-2,7-naphthalenedisulfonic acid (H-acid)
H-acid, or 3-amino-2,7-naphthalenedisulfonic acid, is a disulfonated naphthylamine derivative critical for reactive dye synthesis. It is specifically listed under HTS 2921.45.20.00 as an aromatic amine derivative with multiple sulfonic groups. The compound is a brownish powder used in high-performance textile dyes.
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Alternative Classifications
This product could be classified differently depending on its characteristics or intended use.
If simpler mono-substituted naphthylamine derivatives
Less complex derivatives without dual sulfonic functions classify under the base naphthylamine subheading.
If diluted to standard strengths for azo dye production
Chapter note 1(h) specifically directs such dilutions to Chapter 32 as dye intermediates.
If cyclized heteroatoms alter ring structure significantly
Note 5 excludes certain cyclic forms from amine headings, shifting to heterocyclic compounds in 2933.
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Import Tips & Compliance
• Submit chromatograms proving disulfonic structure to distinguish from mono-sulfonic analogs in the same HTS
• Package in moisture-proof containers; hygroscopic nature requires specific declaration for stability claims
• Avoid anti-dusting agents that impart color, as per note 1(g), to maintain pure chemical classification
Related Products under HTS 2921.45.20.00
Laurent's Acid (5-Amino-1-naphthalenesulfonic acid)
Laurent's acid is a sulfonated derivative of 1-naphthylamine, specifically 5-amino-1-naphthalenesulfonic acid, used primarily as an intermediate in dye synthesis. It falls under HTS 2921.45.20.00 as an aromatic monoamine derivative with sulfonic acid groups, matching the chapter's provisions for chemically defined organic compounds with nitrogen functions. The product is typically supplied as a white to light yellow powder for industrial chemical applications.
8-Amino-2-naphthalenesulfonic acid (Chicago Acid)
Chicago acid, or 8-amino-2-naphthalenesulfonic acid, is a key naphthalene-based amine-sulfonic acid used in azo dye manufacturing. Classified under HTS 2921.45.20.00 as a derivative salt of 2-naphthylamine with sulfonic functionality, fitting the aromatic monoamine category in Chapter 29. It appears as an off-white crystalline powder essential for textile dye intermediates.
4-Amino-1-naphthalenesulfonic acid, sodium salt (Naphthionic acid sodium salt)
Naphthionic acid sodium salt, chemically 4-amino-1-naphthalenesulfonic acid sodium salt, serves as a diazo component in dye chemistry. It matches HTS 2921.45.20.00 explicitly as a named aromatic monoamine derivative and salt thereof. Supplied as a soluble powder for coupling reactions in pigment production.
8-Anilino-1-naphthalenesulfonic acid (Phenyl Peri acid) and its salts
Phenyl Peri acid, 8-anilino-1-naphthalenesulfonic acid, features an anilino substitution on naphthylamine with sulfonic acid. Explicitly covered by HTS 2921.45.20.00 as a named derivative salt of aromatic monoamines. Used in specialty dyes requiring peri-position reactivity.
7-Amino-1,3,6-naphthalenetrisulfonic acid (R-acid)
R-acid, chemically 7-amino-1,3,6-naphthalenetrisulfonic acid, is a trisulfonated naphthylamine for direct dyes. Listed under HTS 2921.45.20.00 for its aromatic amine-sulfonic structure per Chapter 29 definitions. Typically a soluble salt form for aqueous dye processing.
N-Ethyl-1-naphthylamine
N-Ethyl-1-naphthylamine is an alkylated derivative of 1-naphthylamine explicitly named in HTS 2921.45.20.00. This liquid aromatic monoamine serves as an intermediate in pharmaceutical and dye production without sulfonic groups. It fits Chapter 29 as a chemically defined amine-function compound.