Maleic anhydride is white crystals, its chemical formula is C4H2O3, with a relatively strong pungent odor. The melting point and boiling point are 52.8℃ and 202.2℃ respectively, and the flash point is 110℃. Under low temperature, it is easy to vaporization, it can soluble in alcohol and acetone, and maleic acid can be generated when it meets water. Maleic anhydride is mainly used for the synthesis of unsaturated polyester resin, and can also be used as an intermediate in the production of lubricating oil and food additives. When maleic anhydride is in direct contact with high heat, open flame or oxidant, it is very likely to burn, and maleic anhydride also has a certain harm to human health, it can invade the human body through three ways-inhalation, ingestion and skin absorption. Maleic anhydride dust and steam have strong irritants, not only cause chemical burns to the human body, but also stimulate the skin, mucosa and eyes, if the human body inhales excessive maleic anhydride, it will lead to breathing difficulties, and easy to cause bronchitis, pharyngitis and other diseases, accompanied by abdominal pain; Maleic anhydride also has a certain sensitization, long-term exposure to the human body will cause rash and asthma; The chronic effects of maleic anhydride include nasal mucosa ulcer and chronic colitis.
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