2904.10.15.00 - Mixtures of 1,3,6-naphthalenetrisulfonic acid and 1,3,7-naphthalenetrisulfonic acid

This classification encompasses specific mixtures of sulfonated naphthalenes, namely 1,3,6-naphthalenetrisulfonic acid and 1,3,7-naphthalenetrisulfonic acid. These compounds are characterized by the presence of three sulfo groups (-SO₃H) attached to a naphthalene ring structure. The classification applies to these acids in their free form or as salts thereof. They are typically used as intermediates in the synthesis of dyes and other organic chemicals.

Distinct from sibling categories, this entry specifically addresses a mixture of two trisulfonic acids of naphthalene. For instance, it is differentiated from 2-Anthracenesulfonic acid (2904.10.04.00) by both the core hydrocarbon structure (naphthalene vs. anthracene) and the number of sulfo groups. Similarly, it is distinguished from benzenesulfonic acid derivatives like benzenesulfonyl chloride (2904.10.08.00) and disulfonic acids of naphthalene such as those found under 2904.10.10.00, by the higher degree of sulfonation and the specific naphthalene isomer composition.

As this is a leaf node, there are no further subcategories. Classification under this heading is determined by the precise chemical identity of the mixture, focusing on the presence of both 1,3,6-naphthalenetrisulfonic acid and 1,3,7-naphthalenetrisulfonic acid, often in specific ratios relevant to their industrial applications.