How to Enhance Dye Color Fastness and Yield through Quality Control of Refined Naphthalene

"How to Enhance Dye Color Fastness and Yield through Quality Control of Refined Naphthalene"

Core content

Special requirements for refined naphthalene in the dye industry

• Key purity indicators: ≥99.5% (industrial naphthalene usually cannot meet the requirements of dye synthesis);

• Impurity control: Sulfur content (affecting color), phenols (causing side reactions), ash (reducing product consistency);

• Physical properties: Crystalline form (affecting dissolution rate), melting point range (80.1±0.5℃ is preferred).

2. The correlation between refined naphthalene and dye properties

• Color light stability: Impurities (such as thiophene) can cause dye color deviation (such as yellowish tint);

• Reaction efficiency: High-purity refined naphthalene can enhance the rate of condensation reactions (such as in the synthesis of acid dyes);

• Environmental compliance: Low-sulfur naphthalene (< 50ppm) helps to pass REACH and OEKO-TEX certifications.

3. Selection suggestions

• Disperse dyes: Low-ash (< 0.05%) refined naphthalene is preferred to avoid the impact of particulate impurities on dispersibility.

• Reactive dyes: Moisture content should be controlled (< 0.1%) to prevent hydrolysis side reactions.

Our refined naphthalene, processed through hydrofining, has a sulfur content of less than 10ppm, which can help customers reduce desulfurization costs in dye post-treatment and improve batch consistency.