Production process of poly(arylene sulfide) and production apparatus thereof
US8981041B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jul 6, 2011 |
| Grant date | Mar 17, 2015 |
| Priority date | — |
| Expiry date | Jul 6, 2031 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08G75/14
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
A production process of a poly(arylene sulfide) (PAS), including a polymerization step of forming a PAS from a sulfur source that is an alkali metal (hydro)sulfides and a dihalo-aromatic compound in an organic amide solvent; a separation step of PAS particles; a countercurrent washing step that is a step of washing the PAS particles with water and/or an organic solvent, wherein a downward current of a PAS particle-containing aqueous slurry is continuously brought into countercurrent contact with an upward current of a washing liquid; a PAS particle re-separation step of capturing a washing waste liquid by a PAS particle re-separating unit, in which a micro-slit filter has been installed, and then re-separating the PAS particles from the micro-slit filter, preferably using a backwashing unit, to discharge them; and a collecting step of the PAS particles discharged, and a production apparatus of a poly(arylene sulfide).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.