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