MUMBAI, India, July 30 -- Intellectual Property India has published a patent application (202631083798 A) filed by Kamalesh Roy on July 07, 2026, for A Process For Recycling Polyethylene Terephthalate Waste Into Bis(2-Hydroxyethyl) Terephthalate Using Magnetically Recoverable Catalyst.
Inventors include Kamalesh Roy; and Dr. Chandan Kumar Ghosh.
The application for the patent was published on July 24, 2026, under issue no. 30/2026.
Abstract: The present invention provides an integrated process for recycling polyethylene terephthalate (PET) waste into bis(2-hydroxyethyl) terephthalate (BHET) using a magnetically recoverable heterogeneous nano-catalyst. The process comprises reacting PET feedstock with ethylene glycol at 190-220°C in the presence of a magnetically separable layered double hydroxide (LDH) catalyst, preferably cerium-doped nickel-iron LDH (1mol% Ce). Upon completion, the catalyst is efficiently recovered from the hot reaction mixture using a high-gradient magnetic separator and reused for four to six cycles without significant loss of activity. The product stream is purified by hot water addition to remove oligomers, treatment with amine-functionalized activated carbon for decolorization of colored feedstocks, and cooling crystallization to obtain high-purity BHET. Excess ethylene glycol is recovered by distillation and recycled. The process achieves BHET yields up to 98.4% from bottle flakes and 77.8% from textile waste, providing a sustainable and industrially applicable solution for PET waste recycling.
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