This specific carbonate concentration improves the settling characteristics of {HEAD ~ the catalyst} and reduces catalyst carryover into {TAIL ~ the crude hexamethylene diamine} during decantation 
This specific carbonate concentration improves the settling characteristics of { HEAD ~ the catalyst } and reduces catalyst carryover into { TAIL ~ the crude hexamethylene diamine } during decantation
OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH