乙醇还原萘醌含铬废液及其制备氧化铬绿  

Reduction of naphthoquinone waste liquid containing chromiumwith ethanol and preparation of chromium oxide green

作　　者：曾奎 姜启彬 全学军[1] 李纲 邱发成 ZENG Kui;JIANG Qi-bin;QUAN Xue-jun;LI Gang;QIU Fa-cheng(Institute of Chemistry and Chemical Engineering,Chongqing University of Technology,Chongqing 400054,China)

机构地区：[1]重庆理工大学化学化工学院,重庆400045

出　　处：《化学工程》2021年第12期1-6,共6页Chemical Engineering(China)

基　　金：重庆市高校优秀成果转化项目(KJZH17128);重庆市社会民生保障科技创新项目(cstc2017shmsA100009);重庆理工大学研究生创新项目(clgycx 20202055)。

摘　　要：以萘醌含铬废液为原料,乙醇为还原剂,采用合理的实验设计和响应面法优化获得乙醇还原萘醌含铬废液的最佳工艺条件,并从还原溶液中回收三价铬制备氧化铬绿。研究了不同单因素对还原萘醌含铬废液的影响,通过中心合成实验设计及响应曲面分析法对还原过程进行优化,对最佳还原条件下的溶液进行了氧化铬绿的制备,并对所得产品进行了X射线衍射(XRD)和粒度分析。实验结果表明:温度对乙醇用量低于5时的影响比乙醇用量高于5时更明显。在转速100 r/min,反应温度82℃,反应时间33 min,乙醇用量(摩尔比)为理论用量的10.5倍最佳优化工艺条件下,铬还原率可达99.36%。XRD分析结果证实了制备的产品为氧化铬绿。粒度分析显示了制备的氧化铬绿粒径集中在0.1—5μm,更利于颜料应用。Using naphthoquinone chromium-containing waste liquid as raw material,ethanol as reducing agent,reasonable experimental design and response surface method were adopted to optimize the best process conditions for ethanol reduction of naphthoquinone chromium-containing waste liquid,and Cr(Ⅲ)was recovered from the reducing solution to prepare chromium oxide green.The effect of different factors on the reduction of naphthoquinone chromium-containing waste liquid was studied.The reduction process was optimized through the central synthesis experiment design and response surface analysis method.The solution under the optimal reduction conditions was prepared for chromium oxide green.The product was subjected to X-ray diffraction(XRD)and particle size analysis.The results show that the temperature has more effect on the amount of ethanol below 5 than that above 5.Under the optimal process conditions of 100 r/min,reaction temperature 82℃,reaction time 33 min,and 10.5 times of the theoretical molar ratio of ethanol dosage(ethanol consumption),the reduction rate of chromium can reach 99.36%.XRD analysis results confirm that the prepared product is chromium oxide green.The particle size analysis shows that the particle size of the prepared chromium oxide green is concentrated in 0.1-5μm,which is more conductive to the application of pigments.

关 键 词：含铬废液 氧化铬绿 乙醇还原 响应曲面法 

分 类 号：TQ136.1[化学工程—无机化工]