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Paratoluenesulfonic acid

(solid and liquid)


Formula: C7H8O3S

Chemical name: p-Toluenesulfonic acid CAS-No. 6192-52-5 (monohydrate) - EINECS-No. 203-180-0

Strong organic acid, white to light pink crystals, soluble in water and polar organic solvents. Contains small amounts of sulfuric acid and, hence, acts irritant. In contrast to strong mineral acids (like sulfuric acid) p-Toluenesulfonic acid is no-oxidizing.

Other trade names: PTSA, Tosylic acid


Chemical production: In organic synthesis as an "organic soluble" acid catalyst. Acetalization of aldehydes, esterification of carboxylic acids, transesterification of esters. Examples of uses: Resins (Melamine and epoxides), hardener for mortar, chipboards, coatings, varnish in furniture manufacture.

Hazards identification / Labelling:


H315 - 319 - 335: Causes skin irritation. Causes serious eye irritation. May cause respiratory irritation.