Study On Pd-Ni@N-MPC And Its Catalytic C-C Coupling Reaction

The traditional mode of economic development is constantly polluting the space for us to live.When we were young,the common green mountains and green water had already disappeared.A series of pollution sources,such as water pollution,solid waste pollution,air pollution and so on,were accompanied by us.With the development of the economy and society,the productivity and output of the basic organic chemicals in China are increasing rapidly,and the production of these organic chemicals is accompanied by a large amount of organic waste.Styrene is an important chemical raw material.In recent years,with the increase of the consumption capacity of styrene in China,the production capacity of styrene has gradually increased,followed by a large number of styrene waste(hereinafter referred to as styrene tar).The traditional way is to sell styrene tar to some qualified fuel companies,because the styrene tar contains the inhibitor 4,6-two nitro-2-secondary butyl phenol(DNBP),and the untreated direct combustion will not only cause environmental pollution but also cause great waste of resources,which does not conform to the environmental protection policy of China.Based on the analysis of the composition of styrene tar,the research on resource utilization of styrene tar has been carried out.1.the aromatic components in styrene tar were separated by vacuum distillation.The aromatic components were separated and identified by GC-MS.The results showed that the aromatic components obtained by vacuum distillation were mainly some simple styrene alkyl compounds,aromatic alkyl groups and DNBP.The components of high boiling point were analyzed by elemental analyzer and infrared spectrometer.The main components of high boiling point components were complex styrene polymers.2.on the basis of the analysis of the main components of styrene tar,the separation and analysis of DNBP in styrene tar by thin layer chromatography and preparation thin layer chromatography was carried out.The separation of DNBP in styrene tar was studied by different thin layer chromatography separation conditions.Finally,the separation effect of other components in DNBP and styrene tar was obtained when the mixed solvent of petroleum ether and dichloromethane was used as unfolding agent.The structure of the isolated DNBP was identified by GC-MS.3.on the basis of the previous separation and analysis of the composition of styrene tar,the separation of DNBP from styrene tar by extraction was studied,including the factors such as the types of alkali,the amount of alkali and so on.The results show that the separation of DNBP from styrene tar can be made by the extraction method.The structure of the separated DNBP is identified by nuclear magnetic resonance,infrared spectrometer and GC-MS.The results show that the substance is DNBP with high content and purity,which lays a good foundation for the further recovery and reuse of DNBP.4.the effects of different sulfonation temperature,time of sulfonation and reaction material ratio on sulfonated reaction were investigated by the sulfonation test of styrene tar after DNBP.The conversion of calcium from styrene tar to styrene tar sulfonic acid is realized.The latter has a certain water reducing performance and can be applied to concrete water reducing agent,which provides a certain basis for the utilization of styrene tar.