Process to separate ε-caprolactam from 6-aminocaproamide and 6-aminocaproamide oligomers
AssigneeDsm N.V.
InventorRudolf P. M. Guit
Life of this patent
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Abstract
Process to separate ε-caprolactam from 6-aminocaproamide and 6-aminocaproamide oligomers, wherein ε-caprolactam, 6-aminocaproamide and 6 aminocaproamide oligomers are present in a first aqueous starting mixture, which mixture is contacted with an alcohol extraction solvent, resulting in a first aqueous raffinate phase which is poor in ε-caprolactam and an alcohol phase which is rich in ε-caprolactam and which alcohol phase contains 6-aminocaproamide and/or 6-aminocaproamide oligomers, wherein the latter alcohol phase is subsequently contacted with water (backwash water) resulting in an alcohol extract phase poor in 6-aminocaproamide and/or 6-aminocaproamide oligomers and a second aqueous raffinate phase rich in 6-aminocaproamide and/or 6-aminocaproamide oligomers.
Claims9
Process to separate ε-caprolactam from 6-aminocaproamide and 6-aminocaproamide oligomers, characterized in that ε-caprolactam, 6-aminocaproamide and 6-aminocaproamide oligomers are present in a first aqueous starting mixture, which mixture is contacted with an alcohol extraction solvent, resulting in a first aqueous raffinate phase which is poor in ε-caprolactam and an alcohol phase which is rich in ε-caprolactam and which alcohol phase contains 6-aminocaproamide and/or 6-aminocaproamide oligomers, wherein the latter alcohol phase is subsequently contacted with water (backwash water) resulting in an alcohol extract phase poor in 6-aminocaproamide and/or 6-aminocaproamide oligomers and a second aqueous raffinate phase rich in 6-aminocaproamide and/or 6-aminocaproamide oligomers.
Dependencies are inferred from the claim text.