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Method for preparing polyalcohol

A polyol and polysaccharide technology, applied in chemical instruments and methods, physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, etc., can solve high reaction temperature, poor selectivity, high energy consumption, etc. problems, to achieve the effect of simple process, easy operation, high conversion rate and selectivity

Inactive Publication Date: 2009-06-10
PEKING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the use of acid will pollute the environment and the conditions are harsh, and the energy consumption is high
There is also a small amount of one-step method of starch hydrolysis and hydrogenation (1] Sharkov, V.I.Angew.Chem.Int.Ed., 1963, 2, 4052] Robinson, J.M.; Burgess, C.E.; Bently, M.A.; Brasher, C.D.; Home, B.O.; Lillard, D.M.; Macias, J.M.; Mandal, H.D.; Mills, S.C.; O'Hara, K.D.; Pon, J.T.; Raigoza, A.F.; Sanchez, E.H.; Villarreal, J.S. Biomass and Bioenergy, 2004, 26, 473. , but the process not only has a high reaction temperature (usually greater than 200 ° C), but also has poor selectivity
Cellulose can be converted simply by applying existing industrial technologies, but there are still many problems in these methods in terms of efficiency, energy consumption, scale, greenness, etc.

Method used

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  • Method for preparing polyalcohol
  • Method for preparing polyalcohol
  • Method for preparing polyalcohol

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Embodiment 1, the catalytic hydrogenation of cellobiose

[0023] 1) Preparation of nanocatalysts

[0024] The preparation process of the catalyst can be carried out according to the literature method. Specifically, the preparation process of the Ru nanoparticle catalyst is as follows: RuCl 3 Formulated as 5 x 10 -3 mol / L aqueous solution 100ml, add an equal volume of ethanol, and then add polyvinylpyrrolidone (hereinafter referred to as PVP), so that the amount of PVP monomer is equivalent to ten times that of Ru ions, heat and reflux for 2 hours, spin evaporate the solution, and then Water was added so that the concentration of Ru nanoparticles became 1.67 x 10 -3 mol / L, the measured solution pH=2.5.

[0025] The catalyst was analyzed by X-ray diffraction (XRD) and high power transmission electron microscope (TEM).

[0026] XRD shows that 2θ=42-44 degrees Ru simple substance characteristic absorption peak is very diffuse or disappears, which proves the small nanome...

Embodiment 2

[0036] Embodiment 2, the catalytic hydrogenation of other polysaccharides or disaccharides

[0037] According to the method of Example 1, using cellulose, starch, cellobiose, maltose and lactose as raw materials respectively, with Ru nanoparticle catalyst, 1%Ru / C catalyst, Pt nanoparticle catalyst, Pd nanoparticle catalyst, Rh nanoparticle catalyst Catalysts and Raney Ni etc. were used as catalysts for catalyzing the hydrogenation reaction, and the reaction was carried out at different reaction temperatures and pH values. The reaction results are listed in Table 2.

[0038] Table 2 Catalytic hydrogenation reaction results of different polysaccharides or disaccharides (reaction pressure is 4MPa)

[0039]

[0040]

[0041] In the table, other alcohols include cellobiitol, hexacarbon tetraol, and the like.

[0042] The above results show that various disaccharide and polysaccharide raw materials can be prepared by the method of the present invention to obtain different pol...

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Abstract

This invention discloses a method for preparing polyol. The method comprises hydrogenating polysaccharide or disaccharide in the presence of nanoscale metal catalyst to obtain polyol. The nanoscale metal catalyst is water-soluble metal nanoparticles or loaded metal nanoparticles. The metal is selected from Ru, Rh, Pd, Pt, Ag, Au, Fe, Co and Ni. The particle diameters are 1-100 nm. The method adopts polysaccharide or disaccharide as the raw material to realize one-step synthesis of polyol by catalytic hydrogenation under mild conditions. The method has such advantages as simple process, easy operation, high conversion rate and high selectivity.

Description

technical field [0001] The present invention relates to a method for preparing polyols. Background technique [0002] Polyols generally refer to alcohols with a hydroxyl number of not less than 2. Common polyols include sorbitol, xylitol, mannitol, maltitol, glycerin, and ethylene glycol. Polyols are traditionally used in industries such as food and medicine. From a practical point of view, the production of polyols from cellulosic biomass is the most promising approach. Generally, polyols are produced by acid hydrolysis coupled hydrogenation process (1] Balandin A A. Izvestiya Akademii Nauk SSSR, 1957, 3922] Vasynina, Gidrirovanie Zhiroy N A. Sakharoy Eurfurola, 1967, 1903] Sharkov V I. ChemieIngemieur Technik, 1963, 35 (7): 494), the reason why acidic conditions must be used for hydrolysis in the process is because cellulose cannot be dissolved in water and general solvents. However, the use of acid will pollute the environment and the conditions are harsh, and the ener...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C31/18B01J23/38B01J23/74
Inventor 寇元颜宁赵晨
Owner PEKING UNIV