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Acrylic Acid is an unsaturated carboxylic acid, with the formula CH2=CHCO2H. Acrylic acid is clear and colourless liquid has a characteristic acrid odour. As it contains a polar carboxylic acid functional group, it is able to dissolve in water and is miscible with relatively polar organic compounds such as alcohols, ethers, and chloroform. Acrylic Acid is air and water sensitive as it reacts readily with free radicals and electrophilic or nucleophilic agents.Acrylic acid may polymerise in the presence of acids, alkalis, amines, peroxides, and iron salts. Prolonged exposure to heat or exposure of light acrylic acid also cause polymerisation. If confined, the polymerisation of acrylic acid can lead to explosion even at room temperature.Acrylic acid is corrosive to metals and tissues.
Acrylic acid can be used in the form of free acids, ammonium and alkali salts in many different applications such as thickeners, dispersing agents, flocculants, wetting agents, coatings, textile finishes protective colloids for stabilizing emulsions and polymer dispersions. Acrylic Acid readily undergoes additional reactions with a wide variety of organic and inorganic compounds, which makes acrylic acid a very useful feedstock for the production of many low molecular compounds. For instance, acrylic acid can be used to produce derivatives of propionic acid with water, alcohols, amines, halogens and chlorinated hydrocarbons. Acrylic Acid can also react with other substances to produce unsaturated fatty acids, heterocyclic compounds and Diels-Alder addition products.
As acrylic acid polymerizes with explosive violence, it can only be shipped after being stabilized by an inhibitor such as Hydroquinone. The removal of the stabilizer is not usually necessary, since its action can be compensated for by adding an excessive initiator.