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Method for producing reducing sugar with agricultural wastes hydrothermal degradation

A technology for agricultural waste and hydrothermal degradation, applied in the field of organic waste recycling and hydrothermal reaction, can solve the problems of low production rate of reducing sugar, production of reducing sugar, unstable decomposition, etc., and achieve easy construction, high product yield, responsive effect

Inactive Publication Date: 2009-07-29
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In the prior art, there are examples of hydrothermal technology to decompose agricultural waste, and the reaction conditions are also near the critical point of water, and reducing sugars are also detected in the liquid phase products, but the generation rate of reducing sugars is very low and is extremely unstable and easy to further develop. Decompose into small molecules such as acetic acid, acetic acid, etc.
Therefore, there are technologies such as hydrothermal technology to produce acid and ethanol at present, but there is currently no background technology for the production of reducing sugar by hydrothermal method

Method used

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  • Method for producing reducing sugar with agricultural wastes hydrothermal degradation

Examples

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Embodiment 1

[0031] Example 1: Hydrothermal degradation of corn stalks to produce reducing sugars

[0032] (1) Use corn stalks with a particle size of 60-200 mesh as the reactant, deionized water as the solvent, and the mass ratio of corn stalks to water is 0.01 to 0.2, and place them in a high-pressure and corrosion-resistant reactor, and the volume of water is the reaction 50-80% of the container volume.

[0033] (2) Place the reactor containing the mixture of corn stalk and water in step (1) in a temperature-controlled salt bath furnace, and control the reaction temperature to 250°C, 300°C and 400°C, at 4.0Mpa and 9.0MPa respectively , 25.0Mpa pressure, and under constant temperature heating at this temperature for 10 minutes, 3 minutes and 1 minute respectively, take out the reactor, and quickly cool it down to room temperature within 20 seconds;

[0034] (3) After the obtained product is filtered through a 0.22-0.45 μm filter membrane, the liquid phase product is a product containing...

Embodiment 2

[0036] Example 2: Production of reducing sugars by hydrothermal degradation of rice husks

[0037] Take rice husks with a particle size of 60-200 mesh as the reactant, use deionized water as the solvent, and the mass ratio of the two is 0.01-0.2. The mixture is placed in a high-pressure reactor, and the volume of water is 50-80% of the reactor volume. Operation process is identical with embodiment 1. The method can realize hydrothermal conversion of rice husks into reducing sugar products, and the yield of reducing sugar (ratio of the mass of reducing sugar produced to the mass of rice husks) can reach more than 30.26%.

Embodiment 3

[0038] Example 3: Hydrothermal degradation of wheat bran to produce reducing sugars

[0039] Take wheat bran with a particle size of 60-200 mesh as the reactant, use deionized water as the solvent, and the mass ratio of the two is 0.01-0.2. The mixture is placed in a high-pressure reactor, and the volume of water is 50-80% of the reactor volume. Operation process is identical with embodiment 1. The reaction product is divided into three parts: liquid phase product, solid phase residue and gas. The liquid phase part mainly contains reducing sugars such as glucose and fructose and small molecular acids. Analysis of the obtained liquid phase product shows that the yield of reducing sugar in the product (the ratio of the mass of reducing sugar produced to the mass of wheat bran) can reach more than 37.60%.

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Abstract

The invention pertains to the technical field of transforming organic wastes into resources and hydro-thermal reaction, in particular to a method of hydro-thermally degrading agricultural wastes to produce reducing sugar. The invention directly utilizes eco-agricultural wastes as the raw materials and de-ionized water as the solvent and hydro-thermally degrades the agricultural wastes to produce reducing sugar within the temperature range from 250 to 400 DEG C and under the condition of certain reaction time in a special hydro-thermal reaction system. In addition, the invention achieves the control of reducing sugar yield by changing the temperature and the time and adding the additives.

Description

technical field [0001] The invention belongs to the technical field of organic waste recycling and hydrothermal reaction, and specifically relates to an efficient and environment-friendly method for producing reducing sugar. Background technique [0002] my country's agricultural waste resources are very rich, and the annual output of crop straw and husk alone reaches more than 700 million tons, of which corn straw (35%), wheat straw (21%) and rice straw (19%) are the largest in my country. Three stalks. In the past, the treatment of agricultural wastes generally took the form of returning to the field, fermenting biogas, and direct burning as fuel. The utilization efficiency was very low, and at the same time, it brought a lot of environmental pollution problems. How to realize the recycling of agricultural waste and obtain high value-added products is of great significance. [0003] Reducing sugar refers to monomolecular sugar with a five-membered or six-membered ring. Th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07H3/02C07H3/04C13K1/02C13K3/00
Inventor 李光明凌芳孔令照王华
Owner TONGJI UNIV
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