Separation and recovery method of polyarlene sulfide

A preparation method of a polyarylene sulfide, comprising:

• dehydrating a hydrosulfide of an alkali metal and a hydroxide of an alkali metal in a mixed solvent of water and an amide-based compound to prepare a sulfur source comprising a sulfide of an alkali metal and the mixed solvent;
• adding a dihalogenated aromatic compound and an amide-based compound to a reactor containing the sulfur source, and performing a polymerization reaction, thus forming a mixed slurry comprising polyarylene sulfide particles, alkali metal halide particles, and the amide-based compound;
• introducing the mixed slurry into a decanter centrifugal separator, and
• operating the decanter centrifugal separator at a speed of 1000 rpm to 2500 rpm, such that the polyarylene sulfide particles are first settled and separated from the mixed slurry, and then the alkali metal particles are settled and removed from the mixed slurry, wherein the polyarylene sulfide particles in the mixed slurry have a particle size of 100 micrometers to 2000 micrometers, and wherein the alkali metal halide particles in the mixed slurry have a particle size of 5 micrometers to 30 micrometers.