P-toluene sulfonic acid (chemical formula: p-CH3C6H4SO3H, also written TsOH) is a non-oxidizing organic acid that is one million times more acidic than benzoic acid. White needle or powder crystal, easily deliquescent, soluble in water, alcohol and other polar solvents. Will make paper, wood and other dehydration occurs carbonization. The most common is p-toluenesulfonic acid monohydrate TsOH·H2O.

Appearance and properties: white crystal

Density: 1.07

Boiling point: 116 °C

Melting point: 106~107℃

Flash point: 41 °C

Refractive index: 1.3825-1.3845

Water solubility: soluble

Normally stable; unstable at high temperature and pressure.

Storage conditions: the warehouse is ventilated and dry at low temperature, and stored separately from the alkali

Usage:P-methylbenzenesulfonic acid is used as an intermediate in medicine (e.g. Doxycycline), pesticides (e.g. Dicofol), dyes, etc. Also used in detergents, plastics, coatings and other aspects.