Method for catalytic conversion preparation of hexahydric alcohol from jerusalem artichoke as raw material

A technology for catalytic conversion and hexavalent alcohol, applied in chemical instruments and methods, preparation of oxygen-containing functional groups reduction, catalysts for physical/chemical processes, etc., can solve the problems of increased operating costs, difficult product separation, poor product selectivity, etc. Low cost, good selectivity and high conversion efficiency

Active Publication Date: 2015-02-04
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, for the reaction of cellulose, in order to improve the conversion rate of cellulose, the required reaction temperature is higher, and the selectivity of the product is also poor.
In addition, in many reactions, cellulose needs to be pretreated to increase the conversion rate of cellulose and the yield of hexahydric alcohols, which invisibly increases the operating cost and also brings environmental pollution problems
[0006] At present, the research on the preparation of hexahydric alcohols from Jerusalem artichoke is mainly concentrated on the biological method (CN101736058A), but this method has disadvantages such as long reaction time, difficult product separation, and relatively low yield.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Catalyst preparation:

[0019] (1) Preparation of solid acid catalyst: Nafion and Amberlyst resins are commercial catalyst products purchased directly.

[0020] The gac used in the present invention carries out pretreatment earlier before use, and method is to adopt mass concentration 20-50% nitric acid to water bath 24h under the condition of 80oC in the air, after repeatedly washing to neutrality, drying overnight at 60oC. Activated carbon, lignin-derived carbon, cellulose-derived carbon, acetylene black, carbon nanotubes, carbon fiber, mesoporous carbon with ordered pore structure CMK-3, OMC, mesoporous carbon with disordered pore structure MC, silicon oxide, Silicon carbide, zirconia, titanium dioxide and concentrated sulfuric acid (95%) are mixed at a mass ratio of 1:15, heated to 250oC under nitrogen protection, kept for 24h, filtered, washed with 80oC hot water for several times, and then washed with deionized water To neutral, dry overnight at 60oC.

[0021] (...

Embodiment 2

[0025] Catalytic conversion experiment: Add 0.5g of Jerusalem artichoke, 0.3g of catalyst and 50ml of water into a 100ml reaction kettle, and then pass through hydrogen to replace the gas three times, fill with hydrogen to 6MPa, raise the temperature to 80oC, and react for 12h. After the reaction, it was lowered to room temperature. The liquid product and the catalyst are separated by filtration, the liquid product is analyzed and detected on a high-performance liquid chromatography calcium-type ion exchange column, and the gas product is analyzed and detected on a gas chromatography TDX-01Packed Column. In the product yield, mannitol and sorbitol were calculated, and gas products (CO2 , CH 4 , C 2 h 6 etc.) to calculate. The yield is calculated according to the percentage of the C content in the product to the C content in the carbohydrates in the raw material, wherein the content of carbohydrates (inulin, fructose, glucose) in the raw material is determined by the 3,5-din...

Embodiment 3

[0027] See Table 1 and Table 2 for the results of catalytic conversion of Jerusalem artichoke to hexahydric alcohols under the action of metal hydrogenation bifunctional catalysts supported by different acid carriers, and the reaction conditions are the same as in Example 2.

[0028] Table 1 Catalysis by Jerusalem artichoke under the action of ruthenium / nickel metal-acidic bifunctional catalysts loaded on different carriers

[0029] Conversion to hexahydric alcohol (catalyst 0.3g, Jerusalem artichoke aqueous solution concentration 1%)

[0030] catalyst

[0031] Ni / AC

[0032] As shown in Table 1, under the reaction conditions, Jerusalem artichoke can produce hexahydric alcohols such as mannitol and sorbitol with high selectivity under the action of ruthenium catalysts loaded on different carriers without concentrated sulfuric acid sulfonation treatment. Under the action of low-cost, simple and easy-to-obtain Ru / AC catalyst, the yield of hexahydric alcohols ...

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Abstract

The invention relates to a method for catalytic conversion preparation of a hexahydric alcohol from jerusalem artichoke as a raw material. The method is characterized in that a raw material of natural biomass jerusalem artichoke (mainly comprising fructose-based polysaccharide carbohydrates) undergoes a reaction at a temperature above 20 DEG C under hydrogen pressure of 1 to 13MPa in the presence of water as a solvent and a catalyst or a mixed catalyst for at least 5 minutes, wherein the catalyst comprises acidic carriers and one or more of transition metals of iron, cobalt, nickel, copper, ruthenium, rhodium, palladium, iridium and platinum loaded on the acidic carriers; and the mixed catalyst comprises solid acids and a metal hydrogenation catalyst comprising carriers and one or more of transition metals of iron, cobalt, nickel, copper, ruthenium, rhodium, palladium, iridium and platinum loaded on the carriers. Through one-step catalytic conversion, high-efficiency, high-selectivity and high-yield preparation of a hexahydric alcohol such as mannitol and sorbitol from jerusalem artichoke as a raw material is realized.

Description

technical field [0001] The invention relates to a method for preparing hexahydric alcohols (mannitol and sorbitol) by using natural biomass Jerusalem artichoke (mainly composed of fructosyl polysaccharide carbohydrates) as raw material through chemical catalytic transformation, specifically, Jerusalem artichoke in hydrothermal The reaction process of preparing hexahydric alcohol through one-step catalytic hydrogenation degradation under the conditions. Background technique [0002] With the depletion of fossil energy and the serious impact on the environment caused by the use of fossil energy, the utilization of renewable resources has attracted more and more attention. As an important part of renewable resources, biomass resources have the advantages of wide distribution, abundant output and low carbon emissions, and are effective carriers of solar energy resources. [0003] Inulin, also known as inulin, is an important part of biomass resources. Usually, inulin is a polys...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C31/26C07C29/132B01J27/053B01J27/224B01J31/06
CPCY02P20/582
Inventor 张涛周立坤王爱琴庞纪峰李昌志郑明远
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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