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Method for producing furfural from hemicellulose

A technology of hemicellulose and furfural, which is applied in the field of chemical synthesis, can solve the problems of high reuse cost, complicated preparation process, and increased production cost, and achieve the effect of reducing solid residue and increasing the yield of furfural

Pending Publication Date: 2022-02-11
SHANGHAI CHANGFA NEW MATERIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The process is: crushing corncobs, hydrolyzing in an acid mixer, steaming, neutralizing, and refining. The preparation process is relatively complicated. A large amount of acid is consumed in the process of acidolysis and hydrolysis. A large amount of liquid waste is generated in the
In addition, due to the addition of acid in the preparation process, the acidity of the solid waste is too high, the cost of reuse is high, and it becomes useless waste residue, causing environmental pollution and increasing production costs.

Method used

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  • Method for producing furfural from hemicellulose

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Present embodiment provides a kind of device that produces furfural by hemicellulose, as figure 1 As shown, the device comprises: reactor 1, liquid separator 2, rectifying tower 3 and finished product tank 4;

[0032] The top of the reactor is provided with a solid feed port for adding hemicellulose, a liquid feed port for adding papermaking wastewater and sulfuric acid, and a high-pressure steam inlet for feeding high-pressure steam; the reactor 1 The bottom of the tank is communicated with the top of the separatory kettle 2;

[0033] The bottom of the liquid separator 2 is communicated with the rectification tower 3;

[0034] The rectification tower 3 communicates with the product tank 4 .

[0035] The separatory tank can also be connected to the waste water recovery tank 5 as required. The rectification tower 3 can also communicate with a residue recovery tank 6 .

[0036] The above-mentioned reactor is provided with a pressure gauge; the rectifying tower is prov...

Embodiment 2

[0038] The present embodiment provides a kind of method that is produced furfural by hemicellulose, uses the device of embodiment 1 to produce, as figure 1 shown, including the following steps:

[0039] Hemicellulose, papermaking wastewater (the main components are water, cellulose, hemicellulose, lignin, soluble salt, xylooligosaccharides and xylose, etc., with a solid content of 5-7%), sulfuric acid (mass fraction of 50 %) into the reaction kettle 1 according to the mass ratio of 1:0.05:0.5, feed high-pressure steam to react, the reaction temperature is 175°C, the reaction pressure is 0.7MPa, and the reaction time is 3h; after the reaction, open the aldehyde valve , obtain gross aldehyde through condensation;

[0040] The gross aldehyde is passed into the separatory kettle 2 containing toluene solution, and the amount of toluene is 50% of the weight of papermaking wastewater. Separation, take the toluene phase of the upper layer; the waste water phase of the lower layer is...

Embodiment 3

[0043] The present embodiment provides a kind of method that is produced furfural by hemicellulose, uses the device of embodiment 1 to produce, as figure 1 shown, including the following steps:

[0044] Hemicellulose, papermaking wastewater (the main components are water, cellulose, hemicellulose, lignin, soluble salt, xylooligosaccharides and xylose, etc., with a solid content of 5-7%), sulfuric acid (mass fraction of 50 %) into the reactor 1 according to the mass ratio of 1:0.1:1, feed high-pressure steam to react, the reaction temperature is 180°C, the reaction pressure is 0.9MPa, and the reaction time is 3h; after the reaction, open the aldehyde valve , obtain gross aldehyde through condensation;

[0045] The gross aldehyde is passed into the separatory kettle 2 containing toluene solution, and the amount of toluene is 100% of the weight of papermaking wastewater. Separation, take the toluene phase of the upper layer; the waste water phase of the lower layer is passed in...

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Abstract

The invention provides a method for producing furfural from hemicellulose. The method comprises the following steps: adding hemicellulose, papermaking wastewater and sulfuric acid into a reaction kettle, and introducing high-pressure steam for reaction to obtain crude aldehyde; introducing the crude aldehyde into a liquid separation kettle containing a toluene solution, carrying out liquid separation, and taking an upper-layer toluene phase; and introducing the upper-layer toluene phase into a rectifying tower for reduced-pressure rectification to obtain furfural. The invention further provides a device used by the method. Papermaking wastewater is used as a solvent, so that the yield of furfural can be increased, and the furfural can be prevented from being directly discharged into surrounding water to pollute the environment.

Description

technical field [0001] The invention belongs to the technical field of chemical synthesis, in particular to a method for producing furfural from hemicellulose. Background technique [0002] Furfural, also known as 2-furyl formaldehyde, is a colorless almond-flavored oily liquid, soluble in many organic solvents and partially miscible with water. The melting point is -38.7°C, the boiling point is 161.7°C, the freezing point is -36.5°C, and the relative density is 1.1594 (20 / 4°C). Furfural is one of the important chemical raw materials derived from biomass. It is produced by hydrolysis of hemicellulose to generate five-carbon sugars and further dehydration. As an important biomass platform compound, it can be produced by oxidation, hydrogenation, condensation and other reactions. Various derivatives It is widely used in synthetic rubber, resin, medicine, pesticide and other chemical fields. [0003] In the prior art, corncobs are mostly used to produce furfural at present. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07D307/48C07D307/50
CPCC07D307/48C07D307/50
Inventor 施晓旦李明龙金霞朝
Owner SHANGHAI CHANGFA NEW MATERIAL CO LTD
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