化学沉淀法回收兰炭废水中酚类物质的研究  

Study on recycle of phenolic substances from semi-coke wastewater by chemical precipitation method

作　　者：白妮[1,2] 王爱民 王金玺[1,2] 孙志勇 陈锦中[1,2] Bai Ni;Wang Aimin;Wang Jinxi;Sun Zhiyong;Chen Jinzhong(School of Chemistry and Chemical Engineering,Yulin University,Yulin Shaanxi 719000,China;Shaanxi Key Laboratory of Low Metamorphic Coal Clean Utilization,Yulin Shaanxi 719000,China;School of Energy Engineering,Yulin University,Yulin Shaanxi 719000,China)

机构地区：[1]榆林学院化学与化工学院,陕西榆林719000 [2]陕西省低变质煤洁净利用重点实验室,陕西榆林719000 [3]榆林学院能源工程学院,陕西榆林719000

出　　处：《煤化工》2022年第2期34-37,共4页Coal Chemical Industry

基　　金：陕西省科技厅项目(2020SF-414);榆林市科技局项目(CXY-2020-005)。

摘　　要：采用化学沉淀法,通过加入甲醛生成沉淀来回收兰炭废水中的酚类物质,研究了甲醛加入量、反应温度和反应时间对兰炭废水上清液挥发酚浓度的影响,并利用红外光谱和扫描电镜对下层沉淀物的结构和形貌进行表征。结果表明,当挥发酚与甲醛的质量比约为0.22∶1、反应温度为70℃和反应时间为120 min时,废水上清液中挥发酚质量浓度降低到635 mg/L,酚类物质回收率达45.7%;废水下层沉淀物的主要红外吸收峰位置和微观形貌与酚醛树脂基本一致,说明了甲醛与兰炭废水反应主要产物应为酚醛树脂。Phenolic substances were recycled by adding formaldehyde to generate precipitation by the chemical precipitation method.The impacts of formaldehyde addition amount,reaction temperature and reaction time on the concentration of volatile phenol in supernatant of semi-coke wastewater were studied.The structure and morphology of subsediment in semi-coke wastewater were characterized by Fourier transform infrared spectrometer and scanning electron microscopy.The results showed that the concentration of volatile phenols in the supernatant was reduced to 635 mg/L when the mass ratio of volatile phenols to formaldehyde was about 0.22∶1,reaction temperature was 70℃and reaction time was 120 minutes,and the recovery of phenols was up to 45.7%.The positions of the main infrared absorption peaks and microstructure of subsediment were basically consistent with those of phenolic resin,indicating that phenolic resin was the main product of the reaction between formaldehyde and semi-coke wastewater.

关 键 词：兰炭废水 酚类物质 化学沉淀法 甲醛加入量 反应温度 反应时间 回收 酚醛树脂 

分 类 号：X784[环境科学与工程—环境工程]