The invention discloses a preparation method of
anhydrous system o-nitroanisole, which comprises the following steps: mixing and stirring o-nitro
benzene chloride,
methanol, and an alkalization deacidification agent, heating the mixture with a heating speed of 30 DEG C / h for
reflux reaction, controlling the temperature at 40-80 DEG C, performing the
reflux reaction for 2-10 h, filtering, recovering
methanol, performing reduced-pressure
distillation to obtain the product of o-nitroanisole. The invention obtains the product by directly heating o-nitro
benzene chloride,
methanol, and an alkali; after the reaction, the reaction solution is directly pressed into a storage groove for
precipitation; methanol is recovered (by direct recycle); the obtained product and unreacted o-nitro
benzene chloride (for recycle) are treated by rectification; the
utilization rate of o-nitro benzene chloride reaches above 98%, and the yield of o-nitroanisole reaches 93%-95%; the
utilization rate of methanol is greatly increased; the process steps are reduced; the
distillation is reduced; the
energy consumption is saved; and waste water generated during a traditional process is converted into
solid wastes. Compared with the traditional processes, the invention has the advantages of short process, low
energy consumption, high
utilization rate of o-nitro benzene chloride, and less
pollution.