Xylene sulfonic acid
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Properties
Appearance    (1), solid.
Solubility    soluble in water.
Stability    stable.
Risk    Solid form: corrosion; flammable material; irritation, moderate irritation to skin, eye. Harmful products of combustion are CO, CO2 and so on. Contact with strong oxidants, can cause to burn.
GHS (Rev.6) label:   
Ecology    may be hazardous to environment. Water body should be given special attention.
Biodegradability    biodegradable.
Characteristics    excellent hydrotropic, viscosity reducing, pour point depressing, anti-caking, dispersing, emulsifying, wetting, cleansing abilities.
Synthesis
Currently, sulfonation reaction through continuous reactor (such as: falling film reactor) is the most widely used method for preparing sulfonates.