Furfural preparation process

A preparation process and furfural technology are applied in the field of furfural preparation technology to achieve the effects of reducing waste water discharge, inhibiting side reactions and enhancing dehydration selectivity

Pending Publication Date: 2020-10-30
QINGDAO UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Aiming at a series of problems existing in the existing furfural production process, the technical problem mainly solved by the present invention

Method used

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  • Furfural preparation process

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Experimental program
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Effect test

Embodiment 1

[0031] combine figure 1

[0032] A furfural preparation process device, comprising a hydrolysis reaction kettle 1, the bottom of the hydrolysis reaction kettle 1 is connected to the bottom of the filter 2 through a pipe a, the upper part of the filter 2 is connected to the top of the dehydration reaction kettle 3 through a pipeline b, and the dehydration reaction kettle 3 The top is connected to the inlet of the aldehyde vapor condenser 4 through the pipe c, the outlet of the aldehyde vapor condenser 4 is connected to the stratified tank 5 through the pipe g, and the bottom of the stratified tank 5 is connected to the extraction centrifuge 7 through the pipe d, and the extraction centrifuge 7 The top of the furfural rectification tower is connected to each other by the 8 inlets of the pipeline e, and the upper part of the extraction centrifuge 7 is connected to the lye tank 6 by a pipeline, and the pipeline h is arranged between the top and the bottom of the furfural rectifica...

Embodiment 2

[0041] Adopt the preparation process device of furfural described in embodiment 1, carry out the technique that furfural is prepared, concrete steps are as follows:

[0042] 1) Combine corn cob, SO 4 2- / Fe 2 o 3 -α-Al 2 o 3 The loaded solid acid catalyst is added to the hydrolysis reactor 1 through the solid feed port 11, and the deionized water is passed through the deionized water feed port 12 to hydrolyze the reactor 1, and the temperature and pressure are controlled to start the reaction. After 2 hours of reaction, the reaction solution is Pipeline a enters the catalyst / aldehyde residue filter 2 for filtration, uses nitrogen to dry the filter cake through the first nitrogen inlet 21, and obtains corncob hydrolyzate;

[0043] 2) Add the corn cob hydrolyzate and catalyst obtained in step 1) into the dehydration reactor 3, control the temperature at 160°C and pressure to start the reaction, nitrogen enters the dehydration reactor 3 through the second nitrogen inlet 31, ...

Embodiment 3

[0057] Adopt the preparation process device of furfural described in embodiment 1, carry out the technique that furfural is prepared, concrete steps are as follows:

[0058] 1) Combine corn cob, SO 4 2- / Fe 2 o 3 -α-Al 2 o 3 The supported solid acid catalyst is added to the hydrolysis reactor 1 through the solid feed port 11, and the deionized water is passed through the deionized water feed port 12 to hydrolyze the reactor 1, and the temperature and pressure are controlled to start the reaction. After 2.5 hours of reaction, the reaction The liquid enters the catalyst / aldehyde residue filter 2 from the pipeline a to filter, and uses nitrogen to dry the filter cake through the first nitrogen inlet 21 to obtain the corncob hydrolyzate;

[0059] 2) Add the corncob hydrolyzate and catalyst obtained in step 1) into the dehydration reactor 3, control the temperature at 165°C and pressure to start the reaction, nitrogen enters the dehydration reactor 3 through the second nitroge...

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Abstract

The invention discloses a furfural preparation process. The furfural preparation method adopts a two-step method. The method comprises the following specific steps: firstly, catalyzing hydrolysis of hemicellulose in corncobs by adopting an SO4 < 2->/Fe2O3-alpha-Al2O3 supported solid acid catalyst; then catalyzing corncob hydrolysis reaction liquid to prepare furfural by using a novel catalyst instead of sulfuric acid, stripping crude aldehyde in the reaction system by using nitrogen instead of water vapor, performing alkali washing and refining on the stripped crude aldehyde by using a continuous centrifugal extraction refining method, introducing the crude aldehyde into a rectifying tower, and rectifying to obtain furfural with the purity of over 99%. According to the method, the furfuralis prepared through the two-step method, lignin and cellulose in the corncob residues can be reserved for reuse, the concentration of the crude aldehyde is increased through nitrogen steam stripping,the furfural production yield is increased, and the wastewater yield is reduced.

Description

technical field [0001] The invention relates to the field of chemical production, in particular to a preparation process of furfural. Background technique [0002] Furfural is also called furfural (α-furan formaldehyde), molecular formula: C5H4O2; English name: furfural. Pure furfural is a colorless liquid with special almond-like aroma, melting point -38.7°C, boiling point 161.7°C, relative density 1.1594 (20 / 4°C), slightly soluble in cold water, soluble in hot water, ethanol, ether, benzene, acetone and other organic solvents. Volatile, its vapor forms explosive mixtures with air. The industrial product is a brown liquid, which quickly turns brownish black under the action of light, heat, air and inorganic acids. Furfural is a renewable biomass-based platform compound that plays an important role in industrial production. Thousands of chemicals can be directly or indirectly synthesized from furfural. Therefore, furfural is widely used in chemical industry, synthetic re...

Claims

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Application Information

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IPC IPC(8): C07D307/50B01J27/053B01J31/04B01J31/26B01J31/30
CPCC07D307/50B01J27/053B01J31/04B01J31/26B01J31/30
Inventor 王达彤王灏张晓霞杨旭岳涛
Owner QINGDAO UNIV OF SCI & TECH
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