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Acidic solid catalyst used for catalyzing conversion of fructose into 2,5-dimethylfuran in one step

A solid catalyst, dimethylfuran technology, applied in the direction of organic compound/hydride/coordination complex catalyst, physical/chemical process catalyst, catalytic reaction, etc., can solve problems such as high separation cost, high boiling point, etc. The effect of excellent stability, avoiding high energy consumption and inefficiency

Active Publication Date: 2019-07-09
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] However, since HMF needs to be separated and purified after the dehydration reaction of sugar compounds, its extremely high boiling point leads to high separation costs, which has become an important factor limiting this process route

Method used

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  • Acidic solid catalyst used for catalyzing conversion of fructose into 2,5-dimethylfuran in one step
  • Acidic solid catalyst used for catalyzing conversion of fructose into 2,5-dimethylfuran in one step
  • Acidic solid catalyst used for catalyzing conversion of fructose into 2,5-dimethylfuran in one step

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Experimental program
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Embodiment approach

[0063] As mentioned earlier, the current production of 2,5-dimethylfuran on biomass is mainly prepared from 5-hydroxymethylfurfural (HMF) by hydrogenolysis. However, since HMF needs to be separated and purified after the dehydration reaction of sugar compounds, its extremely high boiling point leads to high separation costs, which has become an important factor limiting this process route. For this reason, the present inventors conducted extensive research on the process of producing 2,5-dimethylfuran based on biomass.

[0064] The reaction process of converting fructose into 2,5-dimethylfuran in one step is as follows: figure 1 shown. From Figure 1 It can be seen that fructose undergoes dehydration reaction under acidic conditions to first obtain HMF, and then HMF and hydrogen source obtain 2,5-dimethylfuran under the action of the hydrogenation reaction center, so the requirements for the catalyst are 1) acidity; 2) It has hydrogenation sites.

[0065] Such as figure 1...

Embodiment 1

[0130] (1) Add divinylbenzene (2.0g) and azobisisobutyronitrile (0.05g) into a mixed solution of THF (20mL) and water (2mL), and then add sodium p-styrenesulfonate (0.16 g) and 1-vinyl-2-pyrrolidine (0.23 g), after stirring at room temperature for 3 hours, a mixed solution of the precursor of the porous polymer carrier was obtained.

[0131] (2) The mixed solution of the precursor of the porous polymer carrier was transferred to an autoclave and crystallized at 373 K for 24 hours. After evaporating the solvent at room temperature, the precursor of the multifunctional porous polymer was obtained.

[0132] (3) Take 1 g of the porous polymer carrier and disperse it in a mixed solution (1 mol / L) of sulfuric acid and ethanol, and perform acid exchange treatment for 24 hours; after drying at room temperature, an acidic porous polymer material is obtained.

[0133] (4) Take 1 g of the acidic porous polymer material synthesized above and immerse it in degassed ethylene glycol / glycerol...

Embodiment 2

[0137] This embodiment is different from embodiment 1 in that:

[0138] Add 0.16g of N,N'-methylenebisacrylamide in step (1).

[0139] It is measured that the contact angle between the material and water is 131°, and the acid content is 0.21mmol / g.

[0140] All the other reaction conditions are the same as in Example 1.

[0141] According to the test and calculation based on the formulas (I) and (II), the conversion rate of fructose is >99%, and the yield of 2,5-dimethylfuran reaches 83%.

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Abstract

The invention relates to an acidic solid catalyst used for catalyzing conversion of fructose into 2,5-dimethylfuran in one step as well as a preparation method and application of the catalyst. The catalyst is composed of an acidic porous polymer loaded with metal nanoparticles, wherein the porous polymer is a multifunctional polymer, has different wettability and acidity, and can anchor metal ruthenium, platinum, rhodium, palladium, nickel and cobalt under milder conditions. The catalyst provided by the invention is used for catalyzing conversion of the fructose into the 2,5-dimethylfuran in one step, has excellent catalytic activity, high selectivity and strong stability, and provides a novel idea and method for conversion of bio-based materials into high-value-added chemicals.

Description

technical field [0001] The invention belongs to the field of bio-based chemicals, and relates to an acidic solid catalyst for one-step catalyzing the conversion of fructose into 2,5-dimethylfuran, a preparation method and application thereof. Background technique [0002] 2,5-Dimethylfuran, the English name is Dimethylfuran. The US Energy Center plans to produce 36 billion gallons of second-generation biofuels annually in 2022, of which 16 billion gallons will be obtained from cellulose, and ethanol obtained from lignin is undoubtedly one of the more reliable options to meet this requirement. Compared with 2,5-dimethylfuran, ethanol has a higher O / C ratio, a lower energy density, and is completely miscible with water; in addition, ethanol obtained from biomass needs to undergo energy-intensive separation and distillation Purity and higher ethanol can only be obtained, which greatly increases the cost of using ethanol as a gasoline additive, thus severely limiting ethanol as...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J31/06B01J35/10C07D307/36
CPCB01J31/06C07D307/36B01J2231/641B01J35/61B01J35/647
Inventor 谭天伟申春蔡的纪凯悦冯心强尹佳滨
Owner BEIJING UNIV OF CHEM TECH
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