The invention discloses a preparation method of 4,4-dichlorodiphenyl
sulfone. The preparation method of the 4,4-dichlorodiphenyl
sulfone comprises the following steps of adopting
dimethyl sulfoxide as a catalyst, adopting liquid
sulfur trioxide and
dimethyl sulfate as reaction raw materials, and carrying out
esterification reaction for 2 to 3h at the temperature of 10 to 50 DEG C to obtain an esterification material; dropwise adding the esterification material into
chlorobenzene, stirring and reacting for 3 to 6h at the temperature of 20 to 50 DEG C to obtain a condensation material; warming the condensation material to be 50 to 70 DEG C, dropwise adding the warmed condensation material into alkali solution to hydrolyze, warming to be 70 to 100 DEG C, stirring, backflowing for 1 to 1.5h, cooling to be 10 to 60 DEG C, centrifuging, washing a
filter cake to be neutral, and obtaining the 4,4-dichlorodiphenyl
sulfone. The technological method provided by the invention has the comprehensive advantages of smaller
raw material unit consumption, high yield, stable
production quality, simple preparation process, moderate reaction condition, easiness in operation and control, less three industrial wastes,
energy conservation and
environmental protection and the like compared with the prior art, and is very suitable for popularization and application of the current industrial production.