摘要
为实现紫苏醛生产过程中二氧化锰(氧化剂)的循环利用,采用一种新型的氧化-活化工艺再生得到活性二氧化锰,即以紫苏醇合成紫苏醛过程中产生的含锰废渣为原料,首先采用氯酸钠氧化含锰废渣得到初级二氧化锰,然后使用高锰酸钾对初级二氧化锰进一步活化得到活性二氧化锰。实验表明,制取初级二氧化锰的最佳工艺条件为:反应时间为4h,反应温度为90～95℃,硫酸摩尔浓度为1.5 mol/L,氯酸钠加量为理论量的130%。制取活性二氧化锰的合适条件为:反应温度在60℃时,反应时间为1.5 h;反应温度在50℃时,反应时间为2.5 h。采用氧化-活化法再生的活性二氧化锰氧化紫苏醇,紫苏醛的产率可达52.8%,与使用电解二氧化锰氧化得到的紫苏醛的产率53.1%相当,而使用初级二氧化锰,紫苏醛的产率仅为14.9%。
To recycle the MnO2（oxidizer） used in producing perillaldehyde,a new technology of regenerating activated MnO2 by oxidizing and activating method was used.The waste residue containing manganese,produced in the synthesis of perillaldehyde,was used as original material.Initial MnO2 was obtained when the waste residue was firstly oxidized by NaClO3,then activated MnO2 was obtained after that initial MnO2 was activated by KMnO4.Experiments show that,when the reaction carried out 4 h at 90~95℃,besides the concentration of H2SO4 was 1.5 mol/L and the dosage of NaClO3 was 130% of theoretical dosage,we obtained the optimum primary MnO2.The optimum conditions for preparing activated MnO2 were the reaction processed 1.5 h under 60℃ or 2.5 h under 50℃.When perilly alcohol is oxidized by activated MnO2 regenerated by oxidizing and activating method,the productivity of perillaldehyde can reach 52.8%,which is nearly equal to that of electrolytic manganese dioxide,while the productivity of perillaldehyde is only 14.9%,when initial MnO2 is used.
出处
《环境工程学报》
CAS
CSCD
北大核心
2012年第11期4203-4208,共6页
Chinese Journal of Environmental Engineering
基金
国家自然科学基金资助项目(51278464)
关键词
含锰废渣
氯酸钠
高锰酸钾
活性二氧化锰
紫苏醛合成
waste solid containing manganese oxides
NaClO3
KMnO4
activated MnO2
synthesis of perillaldehyde
