廢PET分解再生製程的經濟評估

Economic Evaluation for the Processes of Waste PET Hydrolysis

高志宇 ； 戴煜暐 ； 萬本儒

《化工》 49卷2期 (2002/04) Pp. 1-9

https://doi.org/10.29803/CE.200204.0001

摘要

本研究是有關將PET 廢棄物轉化為有用的化學品，以避免污染物的產生及資源的浪費。研究中設計及評估了三種水解廢PET的化學程序，這些程序可將廢PET轉化為對苯二甲酸和乙二醇化學品，可做重新生產PET或其他聚酯原料之用。在每年8640公噸廢PET處理量的評量基準下，進行建廠的程序設計與成本做算。研究結果發現，以硫酸催化的製程設備因為使用抗腐蝕的材料，造成建廠總投資費用高出其他兩種製桯很多。此外，以氫氧化銨或以硫酸催化程序中必須消耗多量硫酸，及產生石膏或硫酸銨廢棄物，因而所需的操作費用較高。所以三種水解製程中，以高溫水解PET的再生製程最具競爭力，其建廠投資費用約為美金二百十萬元，生產成本每年約需美金一百七十萬元。經濟效益分析的結果顯示，當產物的價格在$400/ton 、進料廢PET的價和在$200/ton時，此再生工廠稅前的年投資報酬率約為28%。

關鍵字

廢PET ； 綠色化學 ； 永續經營 ； 化工程序經濟評估 ； PET 水分解程序

並列摘要

The process design and economic evaluation for the depolymerization of polyethylene terephthalate (PET) waste was studied. The reaction of hydrolytic depolymerization was used for the generation of useful chemicals of ethylene glycol (EG) and terephthalic acid (TPA). Based on the economic scale of reclaiming 8640 tons of PET waste per year, the plant design and cost estimation were made for three kinds of processes of PET hydrolysis. It was found that high reclaiming cost was required for the process catalyzed by sulfuric acid or ammonium hydroxide, and the process of PET hydrolysis at high temperature showed profitable. The capital investment of the high temperature process is about $2.3 million, and the annual cost of operating is $1.7 million. The economic evaluation of this process showed that the pretax annual return of this reclaiming plant is 28 % when the average products price of TPA and EG is $400/ton and the cost of PET waste feed is $200/ton.