以活性碳吸附水中之苯甲酸及對苯二甲酸

ADSORPTION OF BENZOIC ACID AND TEREPHTHALIC ACID FROM AQUEOUS SOLUTION BY ACTIVATED CARBON

陳宏展(Hung-Chan Chen)

指導教授 ： 陳嘉明

大同大學/工程學院/化學工程學系所/碩士(2011年)

摘要

對苯二甲酸是一種常用於化學工業之塑膠原料，在對苯二甲酸製程過程中所排
放的廢水中包含大量的對苯二甲酸與其他有機酸，所以如何回收有經濟價值的對苯
二甲酸極具實際意義。本研究之目的是使用活性碳進行吸附分離廢水中的苯甲酸及
對苯二甲酸，在實驗部分，單成分與雙成分吸附實驗在批式及固定床中進行，其中
溫度對活性碳吸附的影響將被探討。批式實驗結果顯示，苯甲酸的吸附量高於對苯
二甲酸，而吸附量會隨著溫度越高而下降，對苯二甲酸的活化能高於苯甲酸的活化
能。在固定床實驗方面，對苯二甲酸會比苯甲酸提早貫穿，因此在苯甲酸還沒貫穿
之前，只含有對苯二甲酸的出流水，可以進而有效的回收。氫氧化鈉無法有效地再
生活性碳，因此未來應探討其他有效的再生方法。

關鍵字

對苯二甲酸 ； 苯甲酸 ； 活性碳 ； 吸附

並列摘要

Terephthalic acid (TPA) is commonly used as a plastic raw material in chemical
industry. The wastewater discharged from terephthalic acid manufacturing process contains a large quantity of terephthalic acid and other organic acids, so how to recover the contained terephthalic acid is of practical interest. This study aimed at investigating the adsorptive separation of benzoic acid and terephthalic acid by activated carbon from simulated TPA wastewater. Experimentally, single component and binary component wastewaters were adsorbed by activated carbon in batch tests and fixed bed operations.
The effects of wastewater temperature for activated carbon adsorption were studied. The batch results showed that the adsorption capacity for benzoic acid was higher than that for terephthalic acid and all the adsorption capacity decreased with increasing temperature. The activated energy of terephthalic acid adsorption was higher than that of benzoic acid. In the fixed bed test, terephthalic acid was found to breakthrough earlier than benzoic acid, so that terephthalic acid could be recovered from the effluent before benzoic acid breakthroughed. Sodium hydroxide could not effectively regenerate the activated carbon. Therefore, other effective regeneration method should be further studied in the future.

並列關鍵字

Terephthalic acid ； Benzoic acid ； Activated carbon ； Adsorption

參考文獻

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