The invention relates to a preparation method of an alkaline nano
sieve for reducing oil-soluble acidity of
jatropha curcas insulating oil. The method comprises the following specific steps: S1, pretreatment: pretreating a
molecular sieve with strong acid to enhance the adsorption capacity of the
molecular sieve; and S2, preparing a modified
molecular sieve: carrying out alkalization modification on the molecular
sieve to prepare an alkaline nano molecular
sieve for a
jatropha curcas deacidification process. The step S1 specifically comprises the following steps: S11, adding a proper amount of 6mol / L
hydrochloric acid into the molecular sieve, and dipping for 2 hours; and S12,
roasting the molecular sieve modified by
hydrochloric acid at a high temperature of 400 DEG C for 1 hour to obtain the high-activity molecular sieve. The alkaline nano molecular sieve prepared by the method has strong adsorption capacity, can be used for removing acid through a physical process and a
chemical process, can also be used for effectively removing impurities with small molecular weight of which the molecular
radius is less than 10, and meanwhile, the molecular sieve has a large specific surface area and is in full contact with
jatropha curcas oil, so that the reaction time is shortened, and the deacidification effect is good.