The types of organic solvents are more, according to its chemical structure can be divided into 10 categories: ① aromatic hydrocarbons Category: benzene, toluene, xylene and so on; ② aliphatic hydrocarbons: pentane, hexane, octane, etc. ③ lipid ring hydrocarbon: cyclohexane, cyclohexanone, toluene cyclohexanone, etc. ④ halogenated hydrocarbon: Chlorobenzene, two Chlorobenzene, two. ⑤ alcohols: Methanol, ethanol, isopropyl alcohol, etc. ⑥ ether: ether, propylene oxide, etc. ⑦ ester Category: Methyl acetate, ethyl acetate, propyl acetate, etc. ⑧ ketone: acetone, methyl butanone, methyl isobutyl ketone, etc. ⑨ diol derivative: glycol monomethyl ether, ethylene glycol monoethyl ether, glycol monobutyl ether, etc. ⑩ other: acetonitrile, pyridine, phenol, etc.