Naphthalenesulfonic Acid CAS 9084-06-4

Naphthalenesulfonic Acid has excellent diffusion characteristics, is not permeabile and does not foam. It is resistant to acid, alkali as well hard water. Dispersion: 90%

Description of Naphthalenesulfonic acids:

Physical property

Appearance: Naphthalene sulfonic acid is a white or slightly yellow crystal with a certain lustre.

Melting point: The melting point of naphthalene sulfonic acid is high, usually around 195 ° C, and the specific melting point may vary depending on the purity and crystallization method.

Solubility: Naphthalene sulfonic acid is soluble in water and organic solvents, such as ethanol, ether, etc.

Stability: Naphthalene sulfonic acid is relatively stable at room temperature but may decompose when heated or exposed to light.

Chemical properties

Reactivity: Naphthalene sulfonic acid is easy to react with alkali to produce naphthol and esterify with alcohols. In addition, it can also undergo nucleophilic substitution reactions with alcohols and phenols.

Oxidizing reducibility: Naphthalene sulfonic acid has certain oxidizing reducibility and can be oxidized to naphthalene sulfonate or sulfone. At the same time, naphthalene sulfonic acid is also reductive and can be reduced to naphthol.

Complexability: Naphthalene sulfonic acid can be complexed with many metal ions to form stable complexes. This complexation has important applications in analytical chemistry and separation techniques.

Technical Parameters of Naphthalenesulfonic acids

Applications of Naphthalenesulfonic acids: 

Preservatives: In industries such as food, medicine and cosmetics, it is essential to prevent the growth of bacteria and fungi to ensure product quality and extend shelf life. Naphthalene sulfonic acid is a natural antibacterial agent often used as a preservative in these industries. 

Cleaning products: Naphthalene sulfonic acid is also commonly used in the manufacture of cleaning products, such as laundry detergent, hand sanitizer, etc. Among these products, naphthalene sulfonic acid can effectively remove stains and odours while being mild and resistant to hard water, showing stable surface activity of varying hardness in water.

Pesticides and fertilizers: In the agricultural field, naphthalene sulfonic acid can be used as an additive to pesticides, which helps to improve the adhesion and penetration of pesticides, enhance the control effect, and reduce the amount of pesticides used. In addition, naphthalene sulfonic acid can also be used as a fertilizer carrier and sustained release agent to improve the utilization rate of fertilizer and reduce the loss of fertilizer.

Paints and coatings: They can effectively prevent the pigment and fillers in the production and storage process of precipitation and accumulation to ensure the uniformity and durability of the paint.

Petroleum industry: In the petroleum industry, naphthalene sulfonic acid can be used as an additive for oil production and drilling fluids. It can improve the rheology and lubricity of drilling fluid and oil recovery and drilling efficiency. In addition, naphthalene sulfonic acid can also be used as an oil-cleaning agent to remove oil and impurities in equipment and pipes.

Analytical chemistry: Naphthalene sulfonic acid is often used for complexometric titration to determine metal ions, such as copper, cobalt, nickel, etc. It can also be used as a stationary phase for chromatographic analysis to separate and detect components in complex mixtures.

Synthetic materials: Naphthalene sulfonic acid can react with other compounds to synthesize various polymer materials and polymers. These polymers can manufacture plastics, rubber, fibres and other materials with various applications.

Production Method of Naphthalenesulfonic acids: 

Raw material preparation

The raw materials required to produce naphthalene sulfonic acid include naphthalene, sulfuric acid and sulfur. 

The reaction process

Mixing: Naphthalene, sulfuric acid and sulfur are mixed in a certain proportion to obtain the reaction liquid.

Heating: The reaction liquid is heated to a certain temperature so that the mixture reacts in the reactor.

Sulfonation: Under heating conditions, sulfuric acid reacts with sulfur to replace hydrogen atoms on the naphthalene ring with sulfonic acid groups. This reaction must continue for several hours or more to obtain a high reaction conversion and selectivity.

Separation: After the reaction, the reaction liquid is cooled to room temperature and separated. The naphthalene sulfonic acid was separated from the reaction solution by centrifugation or filtration.

Washing: The separated naphthalene sulfonic acid is washed with appropriate water or organic solvent to remove sulfate ions and unreacted impurities.

Crushing and screening: The dried naphthalene sulfonic acid is crushed and screened to obtain the final product. The bulk naphthalene sulfonic acid can be broken into small particles by grinding, the fine powder and impurities can be removed by screening, and the product's purity and particle size distribution can be improved.

Packing & Shipping Naphthalenesulfonic acids:
The packaging is dependent on the Naphthalenesulfonic acids quantity.
The packaging of Naphthalenesulfonic acids: 1kg/bottle or 25kg/barrel.
Shipping of Naphthalenesulfonic acids Once payment has been received, goods can be sent by air, sea or express.

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