Patent ID: 8961744
Filing Date: 2015-02-24
Classification: B01D,G03F

Abstract:
1. A method of recycling a high-boiling-point waste photoresist stripper, the method comprising: pretreating the high-boiling-point waste photoresist stripper to remove a solid, an insoluble denatured photoresist component and an organic acid component therefrom; subjecting the pretreated high-boiling-point waste photoresist stripper to first stripper recycling including: performing second stripper recycling so that a high-boiling-point stripper solvent is additionally recovered from a high-boiling-point residue including the high-boiling-point impurities removed by the second removal step of the first stripper recycling; and performing third stripper recycling so that the stripper solvent composition recovered by the second removal step of the first stripper recycling and the high-boiling-point stripper solvent additionally recovered through the second stripper recycling are separately recovered as individual high-purity recycled strippers, wherein, through the first removal step and the second removal step of the first stripper recycling, individual high-purity electronic grade recycled stripper solvents are sequentially and separately recovered, depending on a boiling point of each stripper solvent of the stripper solvent composition.