Description

3,6'-Methylenebisnaphthalene-2-Sulphonic Acid is a specialized organic chemical compound primarily used as a key intermediate in the synthesis of dyes and optical brighteners. Its molecular structure, featuring dual naphthalene sulphonic acid groups linked by a methylene bridge, provides excellent chromophoric properties and solubility characteristics. This product is essential for manufacturers in the dyestuff, textile, paper, and detergent industries seeking to produce high-performance colorants and fluorescent whitening agents.

Application

• Dye Intermediate: A critical building block for the synthesis of acid dyes, direct dyes, and other complex colorants for textiles and leather.
• Optical Brightener Production: Serves as a key precursor in manufacturing stilbene-based fluorescent whitening agents (FWAs) used in detergents, papers, and plastics.
• Chemical Synthesis: Used as an intermediate in organic synthesis for creating more complex sulfonated aromatic compounds.
• Research & Development: Employed in R&D laboratories for developing new specialty chemicals and studying sulfonation chemistry.
• Photographic Chemicals: Potential application in the formulation of certain photographic chemicals and sensitizers.
• Polymer Additives: Can be utilized in the production of polymers where sulfonic acid groups are required for functionality.

Basic Information

Product Name	3,6'-Methylenebisnaphthalene-2-Sulphonic Acid
CAS No.	68959-09-1
Molecular Formula	C23H16O6S2
Molecular Weight	452.50 g/mol
Synonyms	3,6'-Methylenebis(2-naphthalenesulfonic acid); Bis(6-sulfo-2-naphthyl)methane; 4,4'-Methylenebis[3-hydroxy-2-naphthalenesulfonic acid] (tautomer); MBNSA; Dinaphthylmethanedisulfonic Acid; 6,6'-Methylenedi(2-naphthalenesulfonic acid); Dye Intermediate OB-1
EINECS	Contact for details

Quality Control

Our production of 3,6'-Methylenebisnaphthalene-2-Sulphonic Acid adheres to stringent quality management protocols to ensure batch-to-batch consistency and high purity. Each lot is analyzed using advanced techniques including HPLC and titration to verify critical parameters such as assay and impurity profiles. A Certificate of Analysis (COA) documenting all test results is provided with every shipment, ensuring full traceability and compliance with customer specifications and industry standards.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry, and well-ventilated area at room temperature (15-25°C). Due to its hygroscopic (moisture-sensitive) nature, the container must be kept tightly sealed when not in use to prevent absorption of atmospheric moisture, which may affect product quality.

Specification

Item	Specification
Appearance	Light yellow to beige powder
Identification (IR)	Conforms
Assay (HPLC)	≥ 95.0%
Loss on Drying	≤ 2.0%
Sulfated Ash	≤ 0.5%
Heavy Metals (as Pb)	≤ 20 ppm
Related Substances (HPLC)	Individual impurity ≤ 1.0%

Note: Specifications can be tailored. Please contact us for the detailed technical data sheet of a specific grade.