摘要
苯胺氧化法生产对苯二酚的二氧化锰废水经熟石灰除杂,用氨水调pH至碱性,用双氧水氧化,硫酸精制得到二氧化锰固体粉末。最佳回收条件为:双氧水用量为64%(占废液体积),反应液pH为10.0,反应温度为25℃,反应时间为1 h,二氧化锰的回收率可达到80%,采用回收的二氧化锰氧化苯胺可使对苯醌的收率从72.48%提高到83.90%。
The recycling of manganese dioxide in wastewater generated in the process of hydroquinone pro- duction by aniline oxidation was studied by using orthogonal experiments. The optimum conditions were obtained as follows ： volume ratio of hydrogen peroxide to waste water 0.64 ： 1 ; pH 10.0 ; reaction time 1 h;reaction temperature 25℃. Under the optimum conditions, the recovery rate of manganese dioxide can be as high as 80%. Moreover, the comparison experiments showed that the yield of p-benzoquinone increased from 72.84% to 83.90% by using recycled manganese dioxide.
出处
《应用化工》
CAS
CSCD
2009年第10期1542-1544,共3页
Applied Chemical Industry
关键词
苯胺氧化
二氧化锰
回收利用
对苯二酚
oxidating aniline
manganese dioxide
recycling
hydroquinone
