3, 4-dihydroxybenzoic acid is naturally found in flue-cured tobacco, Burley tobacco, aromatic tobacco and flue gas. It is an organic compound with white to light brown needle-like crystals that can be dissolved in hot water, ethanol and ether, but cannot be dissolved in benzene, and can only be slightly dissolved in cold water. In boiling water, 3,4-dihydroxybenzoic acid breaks down and releases carbon dioxide.
3, 4-dihydroxybenzoic acid is widely used in medicine, chemical industry, dye, biology and other fields, mainly used as dye intermediates, pharmaceutical intermediates and analytical reagents.
During storage, 3, 4-dihydroxybenzoic acid should be avoided from contacting with strong oxidant and alkali, not to mention mixing with oxidant and strong alkali for storage or transportation. It is recommended to store 3, 4-dihydroxybenzoic acid in a cool, dry and ventilated special explosive warehouse, away from fire and heat sources, and equipped with appropriate leakage containers, explosion-proof lighting and ventilation facilities.