Research On The Synthesis And Application Of New Ionic Liquids

With the increasingly serious problem of environmental pollution and energy shortage,the development of a green renewable energy has become a key research area for scientific researchers.Biomass resources have attracted wide attention because of their low cost,easy access,green environmental protection and other characteristics.As the second largest renewable biomass resource and the first nitrogen-containing organic compound in nature,chitin biomass resource is rich in storage and natural renewable.However,the research of chitin biomass is still in the initial stage,and the efficient utilization of chitin biomass has not been found.As a result,a large number of chitin biomass resources are directly abandoned every year,which not only causes serious waste of resources,but also causes serious environmental problems.Therefore,it is imperative to develop a method for efficient utilization of chitin biomass resources.The conversion of chitin biomass into a high value-added nitrogen-containing platform compound molecule 3-acetamido-5-acetylfuran is an effective way to utilize chitin biomass comprehensively.The prepared platform compound 3-acetamido5-acetylfuran,which can be used to prepare many downstream nitrogen-containing fine chemicals,is a bridge between chitin biomass and fine chemicals.What’s more,it also has good industrial application prospects.At the same time,with the vigorous development of the chemical industry,the related environmental pollution problems are also increasing day by day,especially the environmental pollution caused by pyrogallol widely used in pharmaceutical,plastic,cosmetics and other industries.Due to the shortcomings of time-consuming,high cost,low sensitivity and complex operation,traditional detection methods such as high performance liquid chromatography,chemiluminescence,electrochemical methods have been unable to meet people’s needs.Therefore,it is particularly important to develop a new and efficient analysis and detection method.Fluorescence detection technology has attracted wide attention because of its low cost,simple operation,high sensitivity and high analysis efficiency.Unfortunately,fluorescence detection technology is rarely used in pyrogallol analysis and detection.According to the structural designability of ionic liquids,a series of Bronsted-Lewis acidic ionic liquids based on 1-carboxymethyl-3-methylimidazole chloride and metal chloride were synthesized and characterized.In addition,they were applied in the catalytic conversion of chitin biomass to prepare 3-acetylamino-5-acetylfuran.The effect of reaction conditions on the yield of 3-acetylamino-5-acetylfuran were explored and optimized.What’s more,two novel thiazole poly(ionic liquids)were synthesized and characterized.The fluorescence properties of the two ionic liquids,which were used as fluorescence probe to determine pyrogallol,were detected by fluorescence spectrophotometry.The fluorescence quenching degree of the two ionic liquids was used to analyze the sensitivity of the two ionic liquids for pyrogallol determination.The experimental results suggest that:Firstly,Bronsted-Lewis acidic ionic liquid 1-carboxymethyl-3-methylimidazolium chloromagnesinate(x=0.6)have a good catalytic effect on chitin biomass N-acetylglucosamine.In addition,under the optimum conditions,the yield of 3-acetylamino-5-acetylfuran can reach 66.3%,which is the highest yield of 3-acetylamino-5-acetylfuran so far.Secondly,the two novel thiazole poly(ionic liquids)have good fluorescence properties,and they can be used as fluorescent probes to determine pyrogallol directly.What’s more,the novel thiazole poly(ionic liquids)synthesized by 4-vinylbenzyl chloride and 4-methyl-5-hydroxyethyl thiazole have better fluorescence properties and higher detection sensitivity of pyrogallol under the identical conditions.