Method for passing hemicellulose through continuous flow microchannel reactor to prepare xylose

A technology of microchannel reactor and channel reactor, which is applied in the direction of sugar production, xylose production, application, etc., to achieve the effects of avoiding side reactions, improving reaction efficiency, and reducing dosage

Pending Publication Date: 2017-06-27
SICHUAN GOLDEN ELEPHANT SINCERITY CHEM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Production of xylose from hemicellulose recovered from viscose fiber production waste liquid, using a continuous flow microchannel reactor to prepare xylose, has not been reported yet

Method used

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  • Method for passing hemicellulose through continuous flow microchannel reactor to prepare xylose
  • Method for passing hemicellulose through continuous flow microchannel reactor to prepare xylose
  • Method for passing hemicellulose through continuous flow microchannel reactor to prepare xylose

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] For the continuous flow microchannel reactor (straight channel functional module + "heart-shaped" structural functional module), the connection mode of the microchannel reactor is determined, and the number of mixed reaction modules is determined according to the flow rate and reaction residence time; the heating medium is heat transfer oil. Specific process reference figure 1 .

[0030] Firstly, the aqueous solution or 70-80% solid matter recovered from chemical fiber waste liquid with a hemicellulose content of 15-25% is made into the 12% mass concentration required for the reaction; then the configured hemicellulose aqueous solution and sulfuric acid are passed through After mixing in the mixing module, it is passed into the straight channel of the microchannel reactor for preheating. The set temperature is controlled by an external heat exchanger, and the heat exchange medium is heat transfer oil, and then the flow rate of the hemicellulose aqueous solution is chang...

Embodiment 2

[0037]First, the hemicellulose solution recovered from chemical fiber waste liquid with a content of 15-25wt% is configured to the mass concentration of 12wt% required for the reaction; the hemicellulose aqueous solution and hydrochloric acid required for the reaction are first passed into the mixing module for mixing After that, it is passed into the straight channel of the microchannel reactor for preheating. The set temperature is controlled by an external heat exchanger. The heat exchange medium is heat transfer oil, and then the flow rate of the hemicellulose aqueous solution is controlled by the flow rate of 20ml / min; the flow rate of the catalyst sulfuric acid is 0.3 mL / min;

[0038] After entering the mixing module synchronously through the respective metering pumps for mixing, the preheating module then enters the enhanced mass transfer module for mixing reaction, and the reaction temperature is controlled by an external heat exchanger. After mixing and hydrolysis rea...

Embodiment 3

[0041] The steps and parameters of this example are consistent with those of Example 1, only the concentration of the hemicellulose solution when the raw materials are prepared is changed. In order to ensure that the reaction is carried out normally in the continuous flow microreactor, we did a precipitation test after mixing different hemicellulose concentrations with sulfuric acid, and the results are shown in the following table:

[0042]

[0043]

[0044] It is suitable to select hemicellulose concentration of 12wt% from the table above, and no solid matter will be precipitated during the reaction process, which can ensure the smooth progress of the reaction.

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Abstract

The invention belongs to the field of xylose production and particularly relates to a method for passing hemicellulose through a continuous flow microchannel reactor to prepare xylose; the method comprises the steps of introducing the materials required in reaction, hemicellulose solution and a catalyst, into a mixing module first, introducing into the microchannel reactor for preheating, and controlling the flowing speed of the hemicellulose solution and catalyst through flow control; passing the hemicellulose solution and catalyst through their respective metering pumps, synchronously charging into the mixing module, after passing through a preheating module, charging into an enhanced mass transfer module to carry out mixing reaction, after mixing and hydrolysis in this module, continuously passing through a series of enhanced mass transfer microchannel modules and direct flow microchannel modules, and after the reaction is over, refining the obtained reaction liquid to obtain xylose. The method has the advantages that hemicellulose recycled from chemical fiber industry alkaline wastewater can be used as a raw material, the hemicellulose is directly hydrolyzed into xylose through the continuous flow microchannel reactor, and all the aspects, such as yield, economic benefit, pollution reduction and ecological environment improvement, can be improved greatly.

Description

technical field [0001] The invention belongs to the field of xylose production, and relates to a method for producing xylose by using waste liquid from chemical fibers as a raw material, in particular to a method for preparing xylose by passing hemicellulose through a continuous flow microchannel reactor. Background technique [0002] Xylose is a naturally occurring pentose sugar that exists in plants in a polycondensed state. The finished xylose is white crystal or crystalline powder, easily soluble in water. Xylose is not digested and absorbed, and has no energy value; it activates bifidobacteria in the human intestinal tract and promotes their growth; it is not used by microorganisms in the oral cavity, and has some physiological functions of dietary fiber, which can reduce serum cholesterol and prevent intestinal cancer, etc. ; Simultaneous intake of xylose and calcium can improve the absorption rate and retention rate of calcium in the human body; it can prevent consti...

Claims

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Application Information

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IPC IPC(8): C13K13/00
CPCC13K13/002
Inventor 武长安雷林唐印刘朝慧李旭初郭志刚王明权李刚张帮成
Owner SICHUAN GOLDEN ELEPHANT SINCERITY CHEM CO LTD
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