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A method for promoting the hydrolysis of polysaccharides containing glycosidic bonds under photothermal conditions

A technology of glycosidic bonds and conditions, which is applied in the production of sugar, chemical instruments and methods, organic chemistry, etc., can solve the problems of high production cost, high equipment requirements, low catalyst activity, etc., achieve weak corrosion of equipment, improve efficiency, Ease of recycling

Active Publication Date: 2021-10-15
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

The reaction speed of liquid acid hydrolysis is fast, but the separation of catalyst and product is difficult, and the equipment requirements are high, causing a lot of environmental pollution
Enzymatic hydrolysis has the characteristics of mild conditions, high reaction selectivity, and environmental friendliness. However, cellulolytic enzymes act for a long time and have low efficiency, resulting in high production costs.
Solid acid hydrolysis of cellulose has the advantages of easy separation of reaction products and easy recycling of catalysts, but the activity of this type of catalyst is low

Method used

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  • A method for promoting the hydrolysis of polysaccharides containing glycosidic bonds under photothermal conditions
  • A method for promoting the hydrolysis of polysaccharides containing glycosidic bonds under photothermal conditions
  • A method for promoting the hydrolysis of polysaccharides containing glycosidic bonds under photothermal conditions

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Preparation of 3%Ir / HY Catalyst

[0020] 1g carrier added carrier weight ratio 3%H 2 IrCl 6 The ethanol solution was stirred and evaporated to dryness at 80°C, then placed in an oven at 80°C for 12 hours, and then lowered to room temperature. Then in air atmosphere at 5°C·min -1 The rate was raised to 500°C, fired for 2h, and then lowered to room temperature. Then, under hydrogen atmosphere, at 5°C·min -1 Heating rate to 500 ℃, keep 2h.

Embodiment 2

[0022] The selectivity and conversion rate of the reaction using the Ir / HY catalyst base prepared in Example 1 to convert cellobiose under light and dark conditions are as follows:

[0023] Add 50mg of cellobiose to 4.5g of 1-ethyl-3-methylimidazolium chloride, heat at 100°C for 1h to dissolve all the cellobiose in 1-ethyl-3-methylimidazolium chloride, then add 50mg of catalyst and 0.45 mL of water. Use xenon light to illuminate and heat at 100°C for 8h, and the wavelength of illumination is 420-700nm. Finally, the material composition and content of the liquid phase were analyzed by liquid chromatography. In the dark condition, except that no light is given, the other operation steps are the same as the light condition. The evaluation of selectivity and conversion rate is shown in Table 1.

Embodiment 3

[0025] Preparation of 3%Au / HY Catalyst

[0026] 1g carrier added carrier weight ratio 3% HAuCl 4 The aqueous solution was stirred and evaporated to dryness at 80°C, then placed in an oven at 80°C for 12 hours, and then lowered to room temperature. Under air atmosphere at 5°C·min -1 The rate was raised to 500°C, fired for 2h, and then lowered to room temperature. Then, under hydrogen atmosphere, at 5°C·min -1 Heating rate to 500 ℃, keep 2h.

[0027] The selectivity and conversion rate of the conversion reaction of cellobiose using Au / HY catalyst under light and dark conditions were operated as follows:

[0028] Add 50mg of cellobiose to 4.5g of 1-ethyl-3-methylimidazolium chloride, heat at 100°C for 1h to dissolve all the cellobiose in 1-ethyl-3-methylimidazolium chloride, then add 50mg of catalyst and 0.45 mL of water. Use xenon light to illuminate and heat at 100°C for 8h, and the wavelength of illumination is 420-700nm. Finally, the material composition and content of...

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Abstract

The invention provides a catalyst for promoting the hydrolysis of polysaccharides containing glycosidic bonds under photothermal conditions and its preparation and application. Specifically, the method uses an acidic carrier loaded with metals as a catalyst. In an ionic liquid, under heating and light conditions, Converts polysaccharides containing glycosidic bonds to glucose and 5-hydroxymethylfurfural. Compared with the traditional liquid acid hydrolysis method, the raw material of the invention does not need pretreatment, the catalyst is easy to recover, and the corrosion to equipment is weak. Compared with the direct heating process, under the same conditions, the photothermal process can reduce the onset temperature of the cellobiose hydrolysis reaction by 20 °C. This method provides a new way to solve the problem of fully utilizing cellulose.

Description

technical field [0001] The invention provides a catalyst for promoting the hydrolysis of polysaccharides containing glycosidic bonds under photothermal conditions and its preparation and application. Specifically, the method uses an acidic carrier loaded with metals as a catalyst. In an ionic liquid, under heating and light conditions, Converts polysaccharides containing glycosidic bonds into glucose and 5-hydroxymethylfurfural. This method provides a new way to transform cellulose under mild conditions. Background technique [0002] The emergence of the oil crisis and the serious environmental pollution caused by fossil energy have made people pay attention to the development and utilization of clean energy. Biomass is the fourth largest energy in the world after coal, oil, and natural gas, and it is the only carbon resource that can replace fossil energy to produce fuels and chemicals. It is estimated that the organic carbon fixed by plant photosynthesis in the world rea...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07D307/46
CPCB01J29/126B01J29/146B01J29/22B01J29/7415B01J31/10B01J2229/18C07D307/46C13K1/00C13K1/02C13K1/06
Inventor 李灿张宝李军郭琳
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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