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Product Introduction
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.
This compound is low-toxic but irritates the skin, eyes and respiratory tract. Protective equipment is required during operation. It should be hermetically stored in a dry, cool and ventilated place, kept away from moisture, alkalis and strong oxidants. Relevant safety standards should be followed during use and transportation.
In conclusion, p-Toluenesulfonic acid monohydrate is a high-performance and practical organic acid catalyst. Thanks to its stable structure, mild reactivity and reliable catalytic effect, it is more suitable for routine use than anhydrous PTSA and has broad applications in fine chemical, material and pharmaceutical industries.
