Determination of optimal conditions for extracting terephthalic acid (H2BDC) derived from PET waste using Response Surface Methodology (RSM

Abstract

    This study aimed to develop a practically viable method for extracting terephthalic acid (H₂BDC) from polyethylene terephthalate (PET) waste. Response surface methodology (RSM) was employed to examine the influence and interaction of extractant (NaOH) concentration, hydrolysis time, and size of PET waste on the optimal H₂BDC yield. Experimental results demonstrated that NaOH concentration significantly impacted both H₂BDC yield, following the effects of hydrolysis time and size of PET waste. Under optimal conditions involving a temperature of 160 °C and a 12 h reaction time with 15% NaOH, the yield model predicted an 81.58% yield, which closely matched the experimental results of 84.56%. The findings highlight the high PET-derived H₂BDC quality, meeting commercial product criteria with evidence of high purity. This method presents a promising solution for extracting H₂BDC from PET waste, with potential implications for the recycling industry and a positive environmental impact.