Preparation Of 2,5-dihydroxymethyltetrahydrofuran By One-pot Method Of Biomass Sugars

Today,many developed countries are committed to research and development and research of new and efficient and low pollution and even pollution-free biomass utilization technology to achieve the alternative or mitigate the use of fossil nonrenewable energy purposes,and then to achieve economic Sustainable development to provide fundamental protection.Furan derivatives are a bridge between biomass and chemicals that can replace part of the fossil energy.In this paper,the conversion of biomass fructose to 2,5-dihydroxymethyltetrahydrofuran has been studied:(1)Preparation of 2,5-dihydroxymethyltetrahydrofuran(DHMTHF)by hydrogenation of the bridge between 5-hydroxymethylfurfural(5-HMF)between chemicals of biomass and alternative fossil fuels Were studied.In this chapter,a conventional hydrogenation reaction was carried out using a conventional impregnation method to obtain a complete hydrogenation reaction of 5-hydroxymethylfurfural to 2,5-dihydroxymethyltetrahydrofuran to obtain 100 % 5-HMF conversion and 98 % DHMTHF selectivity,the method has the advantages of simple operation and high efficiency.The catalyst yielded a high yield at relatively mild reaction conditions compared to the ruthenium catalyst reported in the literature.(2)In this chapter,we used heterogeneous solid acid catalyst to prepare 5-hydroxymethylfurfural reaction system in fructose,and we prepared 2,5-dihydroxymethyl tetrahydrofuran(DHMTHF)for 5-HMF downstream hydrogenation.In the aqueous phase and biphasic system,2,5-dihydroxymethyltetrahydrofuran was prepared from fructose by using the commercially available solid acid catalyst Amberlyst-15 and the metal catalyst Ru / NH2 & CH3-MSNs.On the basis of the first part of the work,we proposed the use of amine-based double-modified mesoporous silica beads as NH2 & CH3-MSNs carrier,impregnated with metal ruthenium,under the conditions of optimal hydrogenation activity,Solid acid catalyst Amberlyst-15 mechanical mixture for fructose one-pot preparation of 2,5-dihydroxymethyl tetrahydrofuran reaction,in pure water phase and two-phase system to try to get 20 % and 39.8 % 2,5-dihydroxymethyltetrahydrofuran.(3)(Ru / CH3 & NH2-MNSs @ SiO2-SO3H)with yolk-shell structure for the preparation of 2,5-dihydroxymethyltetrahydrofuran(DHMTHF)by fructose in one step.Preparation of DHMTHF by one-pot fructose dehydration and hydrogenation with the catalyst.The material of the shell grafted sulfonic acid for fructose dehydration preparation of 5-hydroxymethylfurfural,and then the core of the material loaded with metal ruthenium for 5-hydroxymethylfurfural hydrogenation reaction.We used YolkShell bifunctional catalyst for fructose one-step preparation of 2,5-dihydroxymethyltetrahydrofuran reaction,and tried to obtain a relatively high HMF yield in pure aqueous phase,but the high yield of the target we expected has a gap in DHMTHF.