Back to results
US 5,962,681 AGranted
Recovery of caprolactam monomer and oligomer from aqueous polycaprolactam extracts
AssigneeBASF SE
InventorsHorst Egly, Hans-Harald Hunger, Thomas Sauer
Life of this patent
Estimating the term…
Abstract
The disclosure is a process for recovering caprolactam monomer and oligomer from aqueous polycaprolactam extracts by removing the inorganic contaminants present therein.
Claims6
A process for recovering caprolactam monomer and oligomer by removing inorganic contaminants from aqueous polycaprolactam extracts, which comprises passing the aqueous extracts continuously through an evaporator in such a way that the inorganic contaminants become deposited on the heat exchanger surfaces of the evaporator and the caprolactam monomer and oligomer is obtained in the evaporator effluent.
Dependencies are inferred from the claim text.