Provided is a PAS production method and a PAS production apparatus wherein, in a gas-liquid system including a gas phase containing water, a dihalo aromatic compound, and hydrogen sulfide and a liquid phase containing a polar organic solvent and PAS, the dihalo aromatic compound and the hydrogen sulfide that can be volatilized at the time of dehydration from the gas phase can be recovered. The PAS production method according to the present invention includes: a condensation step of obtaining a first intermediate gas phase containing a dihalo aromatic compound and hydrogen sulfide and a first intermediate liquid phase containing water, a dihalo aromatic compound, and a sulfur source by condensation from the gas phase in the gas-liquid; a first recovery step of bringing the first intermediate gas phase into contact with a polar organic solvent to obtain a first recovered gas phase containing hydrogen sulfide and a first recovered liquid phase containing a polar organic solvent, a dihalo aromatic compound, and a sulfur source; and a second recovery step of bringing the first recovered gas phase into contact with an alkali metal hydroxide aqueous solution to obtain a second recovered liquid phase containing water, a sulfur source, and an alkali metal hydroxide.

The present disclosure relates to a preparation method of a polyarylene sulfide, and this method may produce a polyarylene sulfide having properties equal to or higher than those of the conventional method at a high yield by adding an acidic compound in addition to existing materials for dehydration.

To provide a method of manufacturing polyarylene sulfide (PAS) while efficiently recovering an organic amide solvent at a low energy cost, without using an organic solvent, from washing wastewater produced by washing a raw material mixture containing PAS and an organic amide solvent using a solvent containing water; a method of manufacturing PAS by reducing the amount of water supplied when washing the raw material mixture using a solvent containing water; and PAS manufactured by these methods. A method according to the present invention includes: a step of mixing a solvent containing water and a raw material mixture that contains PAS and an organic amide solvent, and then washing the PAS; a step of obtaining a separated liquid by solid-liquid separation; and a step of separating the separated liquid into distilled vapor having a smaller amount of the organic amide solvent and a recovered liquid having a larger amount of the organic amide solvent by heating, where the heating is performed utilizing an increase in temperature based on compressing the distilled vapor and/or compressing a heat medium heat-exchanged with the distilled vapor.

To provide a method of manufacturing polyarylene sulfide (PAS) while efficiently recovering an organic amide solvent at a low energy cost, without using an organic solvent, from washing wastewater produced by washing a raw material mixture containing PAS and an organic amide solvent using a solvent containing water; a method of manufacturing PAS by reducing the amount of water supplied when washing the raw material mixture using a solvent containing water; and PAS manufactured by these methods. A method according to the present invention includes: a step of mixing a solvent containing water and a raw material mixture that contains PAS and an organic amide solvent, and then washing the PAS; a step of obtaining a separated liquid by solid-liquid separation; and a step of separating the separated liquid into distilled vapor having a smaller amount of the organic amide solvent and a recovered liquid having a larger amount of the organic amide solvent by heating, where the heating is performed utilizing an increase in temperature based on compressing the distilled vapor and/or compressing a heat medium heat-exchanged with the distilled vapor.

A polyarylene sulfide resin composition which yields a molded article with excellent toughness, as well as a molded article and an optical ferrule, which are produced using the polyarylene sulfide resin composition. In a polyarylene sulfide resin composition containing a polyarylene sulfide resin and silica particles, a specific amount of a polyarylene sulfide resin having a melt viscosity of 35 to 80 Pa.Math.s, and a specific amount of silica particles having a lower content of coarse powders with a particle size of 45 ?m or more are employed.

A polyarylene sulfide resin composition which yields a molded article with excellent toughness, as well as a molded article and an optical ferrule, which are produced using the polyarylene sulfide resin composition. In a polyarylene sulfide resin composition containing a polyarylene sulfide resin and silica particles, a specific amount of a polyarylene sulfide resin having a melt viscosity of 35 to 80 Pa.Math.s, and a specific amount of silica particles having a lower content of coarse powders with a particle size of 45 ?m or more are employed.

A method for producing a crosslinked polyarylene sulfide resin (PAS resin) that reduces a difference in melt viscosity among lots and has excellent quality stability is provided. Further specifically, the method includes steps of compression-molding an uncrosslinked PAS resin in a powder form to obtain a compression-molded material, measuring a true specific gravity of the compression-molded material, grinding the compression-molded product having a specific range of true specific gravity to obtain a pulverized material, granulating the pulverized material to obtain a granulated material, and oxidatively crosslinking the granulated material obtained in the above step. Also provided are a method for producing a composition containing the crosslinked PAS, and a method for producing a molded article by melt-molding the composition.

Provided are a polyarylene sulfide resin composition which yields a molded article with excellent toughness, as well as a molded article and an optical ferrule, which are produced using the polyarylene sulfide resin composition. In a polyarylene sulfide resin composition containing a polyarylene sulfide resin (A) and silica particles (B), a specific amount of a polyarylene sulfide resin (A) having a melt viscosity of 35 to 80 Pa.Math.s, and a specific amount of silica particles (B) having a lower content of coarse powders with a particle size of 45 ?m or more are employed.

Provided are a polyarylene sulfide resin composition which yields a molded article with excellent toughness, as well as a molded article and an optical ferrule, which are produced using the polyarylene sulfide resin composition. In a polyarylene sulfide resin composition containing a polyarylene sulfide resin (A) and silica particles (B), a specific amount of a polyarylene sulfide resin (A) having a melt viscosity of 35 to 80 Pa.Math.s, and a specific amount of silica particles (B) having a lower content of coarse powders with a particle size of 45 ?m or more are employed.

Provided is a PAS production method and a PAS production apparatus wherein, in a gas-liquid system including a gas phase containing water, a dihalo aromatic compound, and hydrogen sulfide and a liquid phase containing a polar organic solvent and PAS, the dihalo aromatic compound and the hydrogen sulfide that can be volatilized at the time of dehydration from the gas phase can be recovered. The PAS production method according to the present invention includes: a condensation step of obtaining a first intermediate gas phase containing a dihalo aromatic compound and hydrogen sulfide and a first intermediate liquid phase containing water, a dihalo aromatic compound, and a sulfur source by condensation from the gas phase in the gas-liquid; a first recovery step of bringing the first intermediate gas phase into contact with a polar organic solvent to obtain a first recovered gas phase containing hydrogen sulfide and a first recovered liquid phase containing a polar organic solvent, a dihalo aromatic compound, and a sulfur source; and a second recovery step of bringing the first recovered gas phase into contact with an alkali metal hydroxide aqueous solution to obtain a second recovered liquid phase containing water, a sulfur source, and an alkali metal hydroxide.