论文摘要
A non-phosgene route for the synthesis of hexamethylene-1,6-diisocyanate（HDI） was developed via catalytic decomposition of hexamethylene-1,6-dicarbamate（HDC） over Zn–Co bi-metallic supported ZSM-5 catalyst.The catalyst was characterized by FTIR and XRD analyses. Three solvents dioctyl sebacate（DOS）, dibutyl sebacate（DBS） and 1-butyl-3-methylimidazolium tetrafluoroborate（BMIMBF4） were investigated and compared; DOS gave better performance. The catalytic performances for thermal decomposition of HDC to HDI using DOS as solvent were then investigated, and the results showed that, under the optimized reaction conditions, i.e.,10 wt%concentration of HDC in DOS, 250 °C temperature, 60 min reaction time, 83.8% yield of HDI had been achieved over Zn–Co/ZSM-5. Decomposition of the intermediate hexamethylene-1-carbamate-6-isocyanate（HMI） over Zn–Co/ZSM-5 in DOS solvent was further studied and the results indicated that yield of HDI from HMI reached to 69.6%（98.6% HDI selectively） at 270 °C, which further increased the yield of the total HDI(HDItol) to as high as 95.0%. Recycling of catalyst showed that HDI and HMI yield slightly decreased, and by-product yield increased after the catalyst was reused for 4 times. At last possible reaction mechanism was proposed.
论文目录
文章来源
类型: 期刊论文
作者: Yan Cao,Yafang Chi,Ammar Muhammad,Peng He,liguo Wang,Huiquan Li
来源: Chinese Journal of Chemical Engineering 2019年03期
年度: 2019
分类: 工程科技Ⅰ辑
专业: 化学
单位: CAS Key Laboratory of Green Process and Engineering, Institute of Process Engineering, Chinese Academy of Sciences,National Engineering Laboratory for Hydrometallurgical Cleaner Production Technology, Institute of Process Engineering, Chinese Academy of Sciences,University of Chinese Academy of Sciences
基金: Supported by the National Natural Science Foundation of China(21476244,21406245),Transformational Technologies for Clean Energy and Demonstration,Strategic Priority Research Program of the Chinese Academy of Sciences,(XDA 21030600),the Youth Innovation Promotion Association CAS(2016046)
分类号: O623.7
页码: 549-555
总页数: 7
文件大小: 1066K
下载量: 12