Patent ID: 6342580
Filing Date: 2002-01-29
Classification: C08F,C08G,D21H,G03C

Abstract:
A process for lowering epichlorohydrin (EPC), 1,3-dichloro-2-propanol (DCP) and 3-monochloro-1,2-propanediol (MCPD) content of polyamide-polyamine-epichlorohydrin (PAE) resin comprising:(a) passing said PAE resin in the form of an aqueous solution with a dry extract between 2 and 60% through a first column having a first activated carbon bed therein to produce an EPC and DCP-diminished PAE resin; (b) stopping step (a) when DCP first appears in the PAE resin issuing from the first column; (c) passing the EPC and DCP-diminished PAE resin through a second column having a second activated carbon bed therein to produce an EPC, DCP and MCPD-diminished PAE resin, said second activated carbon bed being formed of carbon having an iodine number greater than 500 mg/g, and (d) stopping step (c) when MCPD first appears in the PAE resin issuing from the second column.