Solid acid catalyst for 5-hydroxymethyl furfural synthesis and preparation method thereof

Abstract

The invention provides a solid acid catalyst for 5-hydroxymethyl furfural synthesis and a preparation method thereof and relates to a solid acid catalyst. The invention aims to provide the preparation method of the solid acid catalyst for 5-hydroxymethyl furfural synthesis, which has the advantage that a raw material is cheap, easy to obtain, simple in preparation process, and environmentally-friendly, and can be used for synthesizing 5-HMF (Hydroxymethyl Furfural) through carbohydrate dehydration. The solid acid catalyst for 5-hydroxymethyl furfural synthesis is an oxide load sulfate ion or an oxide load chromium ion. The method comprises the following steps: dissolving oxide into deionized water; then completely precipitating the oxide by using a precipitant, aging, washing, filtering and drying; and finally, soaking the precipitant in sulfuric acid solution or chromium solution, dipping, filtering, drying and roasting to obtain the solid acid catalyst for 5-hydroxymethyl furfural synthesis. The 5-hydroxymethyl furfural does not corrode equipment, is easy to separate and can be recycled. The yield of the 5-hydroxymethyl furfural is high. The solid acid catalyst and the preparation method also have the advantages of environmental friendliness, low cost, simple preparation process, easiness in operation, and safe and reliable manufacturing process.

Description

technical field [0001] The invention relates to a preparation method of a solid catalyst, in particular to a solid acid catalyst used for synthesizing 5-hydroxymethylfurfural and a preparation method thereof. Background technique [0002] 5-Hydroxymethylfurfural (5-HMF) is an acid-catalyzed reaction product of carbohydrates (such as fructose, glucose, sucrose, etc.), and acid is the core catalyst that catalyzes the conversion of carbohydrates to produce 5-HMF. Most of the traditional acid catalysts are some liquid inorganic acids such as HCl, H2SO4, HNO3 and H3PO4, etc. These inorganic acids not only have low catalytic activity, but also have the disadvantages of corroding equipment, difficult to recycle, and polluting the environment ([1]Watanabe M, Aizawa Y,Iida T,Aida T M,Levy C,K Sue,Inomata H.Glucose reactions with acid and base catalysts in hot compressed water at 473K.Carbohydrate Research,2005,340(12):1925-1930.[2]Cheda J N , Roman-Leshkov Y, Dumesic J A. Production...

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Problems solved by technology

Most of the traditional acid catalysts are some liquid inorganic acids such as HCl, H2SO4, HNO3 and H3PO4, etc. These inorganic acids not only have low catalytic activity, but also have the disadvantages of corroding equipment, difficult to recycle, and polluting the environment ([1]Watanabe M, Aizawa Y,Iida T,Aida T M,Levy C,K Sue,Inomata H.Glucose reactions with acid and base catalysts in hot compressed water at 473K.Carbohydrate Research,2005,340(12):1925-1930.[2]Cheda J N , Roman-Leshkov Y, Dumesic J A. Production of 5-hydroxymethylfurfural and furfural by dehydration of biomass-derived mono-and poly-saccharides. Green Chemistry, 2007, 9(4): 342-350.)

[0003] In recent years, there have been many reports on the use of metal chlorides, especially CrCl2 and CrCl3, as Lewis acid catalysts for the preparation of 5HMF. Although CrCl2 and CrCl3 can effectively convert carbohydrates to 5HMF, they have strong toxicity and high cost. Limiting its large-scale application ([3] Zhao H B, Holladay J E, Brown H, Zhang Z C. Metal chlorides ionic l liquid solvents convert sugars to 5hydroxymethylfurfural. Science, 2007, 316 (5831): 1597-1600. [4] Qi X H, Watanabe M, Aida T M, Smith R L. Fast transformation of glucose and di- / polysaccharides into 5hydroxymethylfurfural by microwave heating in an ionicliquid / catalyst system. ChemSusChem,2010,3(9):1071-1077.)

[0004] In 2010, Chareonlimkun et al. synthesized solid acid catalysts TiO2, ZrO2 and TiO2-ZrO2 for the preparation of 5-HMF, but the yield of 5-HMF was only about 10% ([5]Chareonlimkun A, Champreda V, Shotipruk A, Laosiripojana N. Catalytic conversion of sugarcane bagasse, rice husk and corncob in the presence of TiO2, ZrO2 and mixed-oxide TiO2-ZrO2 under hot compressed water (HCW) condition. Bioresource Technology, 2010, 101(11): 4179-4186.), far did not meet the requirements for mass production

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