POLYARYLENE SULFIDE PRODUCTION METHOD AND POLYARYLENE SULFIDE PRODUCTION APPARATUS

摘要

The present invention provides a production method and a production apparatus for a polyarylene sulfide (PAS), thus the formation of a floating polymer and the leakage of the floating polymer to the outside of the vessel in a washing step are prevented, to achieve steady production of the polymer with high quality, to improve the yield of the polymer and to reduce environmental load, wherein the floating polymer refers to a particles of the polymer which are floating on the surface of a washing solution, in the upper part of the inside of a washing vessel, as a result of the adhesion of a gas onto the surface of the particles of the polymer.;The present invention provides a production method for a PAS comprising step (I), performing polymerization, step (II), separating and collecting a polymer, step (III), washing a slurry, and step (IV), collecting the polymer after washing, wherein an aqueous medium is sprayed onto a PAS floating on the surface of the aqueous washing solution in the upper part of the inside of the washing vessel in step (III) (step (IIIa), washing a slurry using a counter current, and/or step (IIIb), treating a slurry with acid using a counter current, or the like); and a production apparatus for a PAS comprising a washing device (counter current washing device and/or a counter current contact/acid treatment device or the like) having an aqueous medium spray means.

主权项

1. A production method for a polyarylene sulfide comprising the steps of:
(I) performing polymerization to produce a polymer via polymerization reaction on: at least one type of a sulfur source selected from the group consisting of an alkali metal sulfide and an alkali metal hydrosulfide; and a dihalo aromatic compound in an organic amide solvent; (II) separating and collecting a polymer from a reaction solution containing the polymer produced by the polymerization reaction; (III) washing a slurry of the collected polymer by bringing the slurry into contact with at least one type of a washing solution selected from the group consisting of water, an organic solvent, and a mixed solution of water and an organic solvent, in a washing vessel; and (IV) collecting the polymer after washing; an aqueous medium being sprayed onto the polyarylene sulfide floating on a surface of the washing solution in an upper part of the inside of the washing vessel in step (III).