公开(公告)号：US20240269897A1

公开(公告)日：2024-08-15

申请号：US18568684

申请日：2022-06-09

申请人： PRPS B.V.

发明人： Martinus Andrija Vossebeld ,  Rudolf Wilhelmus Johannes Morssinkhof

IPC分类号： B29B17/02 ,  B29B17/04 ,  B29K25/00 ,  C07C7/08 ,  C08J11/18

CPC分类号： B29B17/02 ,  C07C7/08 ,  B29B2017/0293 ,  B29B2017/0496 ,  B29K2025/04 ,  B29K2995/0016 ,  C08J11/18

摘要： The invention relates to a method and installation for recycling a polystyrene based material containing organohalogen flame retardant, comprising the steps of: (i) dissolving the polystyrene based material in a high-boiling, apolar, organic reaction solvent: (ii) heating the polystyrene contained in the reaction solvent to a temperature so as to release halogen from the flame retardant; (iii) contacting released halogen with a base so as to form a halogen residue; (iv) removing the halogen residue; (v) pyrolyzing polystyrene contained in the reaction solvent at a temperature so as to depolymerize polystyrene; and (vi) distilling the depolymerized mixture into at least a styrene fraction. For recycling expanded polystyrene the method and installation additionally comprises a step of compacting expanded polystyrene in an compaction solvent, whereafter preferably the compaction solvent is at least partly replaced by the reaction solvent.