The invention provides a preparation method of chloroepoxy
propane by chloropropene epoxidation. Chloropropene, a
solvent and
titanium silicalite
molecular sieve catalyst fine particles are put in a reaction kettle for reaction at the temperature of 10-80 DEG C. The method is characterized in that the reaction kettle is a single kettle or multistage
slurry bed reaction kettles with same or different volumes which are connected in series; the reaction solution needs not to be homogeneous phase,
slurry particles of the chloropropene, the
solvent and the
titanium silicalite
molecular sieve catalyst are added to a first stage reaction kettle by a
metering pump,
hydrogen peroxide is dropwise added to the first stage reaction kettle or each stage of the reaction kettles, the reaction occurs in a weakly acidic condition, materials are subject to oil-water
delamination after the reaction to be divided into oil-phase
slurry and water-phase slurry; the catalyst is suspended in the water phase, and the
oil phase is sent to a rectification
tower to separate the chloropropene, the
epichlorohydrin and trace
methanol; the water phase slurry is filtered, a catalyst
filter cake or concentrated slurry is directly beaten by the
solvent, and pumped to a first stage epoxidation reaction kettle, the water phase slurry contains the
methanol, trace
epichlorohydrin and the water which is generated by the reaction and the water which is taken by the
hydrogen peroxide, the trace
methanol and the
epichlorohydrin are separated out by negative pressure rectification, and the recovered methanol is used for preparation of the catalyst slurry. The method has the advantages of simple process, little solvent consumption and high product separation yield, and is available for industrialized production.