Description

4,4'-Dinitrostilbene-2,2'-Disulfonic Acid Disodium Salt is a high-purity, water-soluble organic intermediate of significant commercial importance. This compound serves as a critical precursor in the synthesis of optical brighteners and fluorescent whitening agents (FWAs), which are essential for enhancing the brightness and whiteness of paper, textiles, and detergents. It is primarily sought after by manufacturers in the specialty chemicals, textile auxiliaries, and detergent industries for its role in producing high-performance additives.

Application

• Primary Intermediate for Optical Brighteners (OBAs): The key starting material for manufacturing stilbene-based fluorescent whitening agents, such as Tinopal® and Blankophor® types.
• Textile Industry: Used in the production of brightening agents applied to cotton, nylon, and other synthetic fibers to improve visual appeal and perceived cleanliness.
• Paper Manufacturing: Essential for creating brightening agents added to pulp or coatings to achieve high-brightness, blue-white paper grades.
• Detergent and Soap Formulation: Incorporated into the synthesis of brighteners for laundry detergents and soaps to compensate for fabric yellowing and enhance whiteness.
• Plastics and Polymers: Serves as a precursor for brighteners used in certain plastics to offset inherent yellowness and improve aesthetic quality.
• Research & Development: Utilized in chemical research for developing new fluorescent dyes, sensors, and advanced organic materials.

Basic Information

Item	Details
Product Name	4,4'-Dinitrostilbene-2,2'-Disulfonic Acid Disodium Salt
CAS No.	3709-43-1
Molecular Formula	C14H8N2Na2O10S2
Molecular Weight	466.32 g/mol
Synonyms	4,4'-Dinitro-2,2'-stilbenedisulfonic Acid Disodium Salt; DNS Acid Disodium Salt; Dinitrostilbenedisulfonic Acid Sodium Salt; 4,4'-Dinitrostilbene-2,2'-disulfonate Disodium; 2,2'-(1,2-Ethenediyl)bis[5-nitrobenzenesulfonic acid] disodium salt; Tinopal Intermediate; Fluorescent Brightener 71 Intermediate; Blankophor Intermediate
EINECS	223-054-8

Quality Control

Our 4,4'-Dinitrostilbene-2,2'-Disulfonic Acid Disodium Salt is manufactured under a strict quality management system. Every batch undergoes rigorous analytical testing, including HPLC for purity and identity confirmation, to ensure it meets the high standards required for sensitive downstream synthesis. A comprehensive Certificate of Analysis (COA) detailing assay, impurity profile, and physical characteristics is provided with each shipment to guarantee batch-to-batch consistency and traceability.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry, and well-ventilated area at ambient temperature (15-25°C). This material is hygroscopic (moisture-sensitive); therefore, the container must be kept tightly sealed after opening to prevent absorption of atmospheric moisture, which can affect product quality and handling properties.

Specification

Item	Specification
Appearance	Yellow to orange-yellow crystalline powder
Identification (IR)	Conforms to structure
Assay (HPLC)	≥ 98.0%
Water Content (KF)	≤ 2.0%
pH (5% Solution)	6.0 - 8.0
Solubility	Freely soluble in water

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