本文選題：煤化工 + 酚氨回收��； 參考：《華南理工大學》2015年碩士論文

【摘要】：劣質煤在400-1000°C處理過程中會產生高濃含酚廢水,工業(yè)上可行的方法是采用酚氨回收技術對廢水中有價值物質回收利用,而后將其送入后續(xù)生化處理階段進一步處理。其中溶劑萃取是酚氨回收的關鍵環(huán)節(jié)。本論文針對高濃含酚廢水的特點,選擇甲基正丁基甲酮(Methyl butyl ketone,MBK)作為萃取脫酚溶劑,并對MBK萃取性能進行了研究。實驗結果表明,MBK是一種優(yōu)異的脫酚萃取劑,對揮發(fā)酚和非揮發(fā)酚都具有很好的萃取效果。在此基礎上,本文探究了MBK最佳萃取脫酚條件,研究了溫度、p H值、相比等對脫酚效果的影響,并結合實際工業(yè)煤氣化廢水的特點,確定比較理想的萃取工藝條件:萃取溫度T=40-50℃,p H=7.0-8.0,三級錯流萃取時,適宜的相比(體積比)是R=1:4-1:5。液液相平衡關系是萃取過程模擬和設計的基礎。本論文測定MBK-苯酚-水、MBK-(鄰/間/對)甲酚-水、MBK-對苯二酚-水三元體系及MBK-水-苯酚-對苯二酚四元體系的多組液液相平衡數(shù)據(jù),并分別用UNIQUAC模型和NRTL模型進行關聯(lián),回歸得到了各體系的UNIQUAC模型和NRTL模型二元交互作用參數(shù)。結果顯示兩個活度系數(shù)模型均能對實驗數(shù)據(jù)進行較好的預測。在液液相平衡研究的基礎上,利用實驗回歸得到的活度系數(shù)模型中的二元交互作用參數(shù),結合化工過程模擬技術對MBK萃取處理工業(yè)含酚廢水過程進行了模擬計算,并對萃取塔、溶劑回收塔和溶劑汽提塔的操作條件進行了模擬優(yōu)化。結果發(fā)現(xiàn),溫度為40℃,相比(質量比)R=1:7.77時,四級逆流萃取可將廢水中總酚含量從12700 mg·L-1降低到300 mg·L-1。公用工程計算結果表明,廢水處理量為100 t·hr-1時,用MBK萃取比用甲基異丁基甲酮節(jié)省冷卻水93 t·hr-1,節(jié)省中壓蒸汽682 kg·hr-1,節(jié)省低壓蒸汽309 kg·hr-1。模擬計算數(shù)據(jù)可為MBK萃取脫酚的工業(yè)化提供參考。
[Abstract]:The low-quality coal will produce high concentration phenol wastewater during the treatment of 400-1000 擄C. the feasible method in industry is to recycle the valuable substance in the wastewater by using phenol ammonia recovery technology, and then send it to the stage of subsequent biochemical treatment for further treatment. Solvent extraction is the key link of phenol ammonia recovery. In this paper, according to the characteristics of high concentration phenol containing wastewater, methyl butyl ketonebutanone (MBK) was selected as the solvent for extraction of phenol, and the extraction performance of MBK was studied. The experimental results show that MBK is an excellent extractant for both volatile phenol and nonvolatile phenol. On this basis, the optimum extraction conditions of MBK were studied, and the effects of temperature and ratio on the removal of phenol were studied, and the characteristics of industrial coal gasification wastewater were also discussed. The optimum extraction process conditions were determined as follows: extraction temperature Tn40 ~ 50 鈩，

本文編號：2116397