Intellectual Property India Publishes Patent Application for Process For Separating High Boilers From Polyamide 6 Depolymerization Mixtures

MUMBAI, India, Sept. 7 -- Intellectual Property India has published a patent application (202617085808 A) filed by Basf Se on July 13, 2026, for Process For Separating High Boilers From Polyamide 6 Depolymerization Mixtures.

Inventors include Blei, Stefan; El-Toufaili, Faissal-Ali; Ravikumar, Vikram; Kotanjac, Zeljko; Laryea, Esther Matyka; Felden, Marc; Gauer, Jochen; Gassmann, Michel; Hetz-Hunsinger, Alexander; and Dienes, Christian.

The application for the patent was published on September 04, 2026, under issue no. 36/2026.

Abstract: A process for separating one or more organic compounds X from an aqueous liquid stream SL0 comprising monomeric e-caprolactam and said one or more compounds X, the process comprising (i) providing the stream SL0 having a temperature TL0 and exhibiting a total concentration cL0(X) of the one or more compounds X and a concentration cL0(C) of monomeric e-caprolactam; (ii) producing in an evaporation unit UE1 from the stream SL0 an aqueous at least partially vaporous stream SV1 and a liquid stream SL1, the stream SV1 having a temperature TV1 with TV1 = TE1 and exhibiting a total concentration cV1(X) of one or more compounds X and a concentration cV1(C) of monomeric e-caprolactam with cV1(C) cL0(C) and cV1(X) cL0(X), and the stream SL1 having a temperature TL1 with TL1 = TE1 and exhibiting a total concentration cL1(X) of one or more compounds X and a concentration cL1(C) of monomeric e-caprolactam with cL1(C) cE1(C) and cL1(X) cL0(X); (iii) producing in a separation unit US1 from the stream SV1 an aqueous vapor stream SV2 and a liquid stream SL2, the stream SV2 having a temperature TV2 with TL0 TV2 = TV1 and exhibiting a total concentration cV2(X) of one or more compounds X and a concentration cV2(C) of monomeric e-caprolactam, and the stream SL2 having a temperature TL2 with TL2 = TV2 and exhibiting a total concentration cL2(X) of one or more compounds X and a concentration cL2(C) of monomeric e- caprolactam with cL2(X) cV2(X) and cL2(C) cV2(C); (iv) passing the aqueous stream SV2 to a water separation unit UWS2.

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