Phenol sulfonic acid (PSA)is a strong organic acid used as a catalyst in chemical synthesis, a pH adjuster, and an intermediate in producing dyes, pharmaceuticals, and surfactants.
α-Naphtholsulfonic acid polyoxyethylene ether functions in tin plating baths by broadening the optimal current density range for electroplated tin, while rendering tin deposits level, bright and compact.
α-Naphthol polyoxyethylene ether serves in tin plating baths to broaden the optimal current density window for tin electroplating and improve the throwing power of the plating solution, yielding level, bright and compact tin deposits. In addition, EN-10 acts as a dispersant to disperse anodic oxidation degradation products of PSA and its salts, preventing their polymerization and adhesion to the surface of tin-plated sheets.
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p-Toluenesulfonic acid monohydrate (PTSA monohydrate, CAS: 6192-52-3) is the most widely used commercial crystalline form of p-toluenesulfonic acid. It has a molecular formula of CHOS and a molar mass of 190.22 g/mol, containing one stably bonded crystal water molecule. Compared with anhydrous PTSA, it exhibits lower deliquescence and better storage stability, making it the preferred form for laboratory and industrial applications.
PTSA monohydrate is a colorless or white crystalline powder with no odor. It dissolves readily in polar solvents such as water, ethanol and methanol, is slightly soluble in ether, and insoluble in non-polar solvents like benzene and alkanes. Featuring low volatility and stable room-temperature properties, it is easy to weigh, store and transport, overcoming the high moisture sensitivity of anhydrous PTSA.
It is a non-oxidizing strong organic acid with acidity similar to sulfuric acid. Different from inorganic strong acids, it rarely causes oxidation, carbonization or other side reactions. Its structurally bound crystal water does not interfere with conventional organic reactions. It can effectively catalyze esterification, condensation, hydrolysis, alkylation and acetylation with stable catalytic activity.
PTSA monohydrate is extensively applied in fine chemistry and scientific research. It serves as an efficient mild catalyst for organic synthesis and resin polymerization, as well as a curing agent for phenolic, amino and acrylic resins to improve curing efficiency and material performance. It is also commonly used in pharmaceutical intermediate synthesis, dye production, metal descaling and electroplating additives.
