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Method for preparing aromatic aldehyde from lignocellulose hydrolysis residue by two-step process

A technology for lignocellulose and aromatic aldehyde, which is applied in the field of preparing aromatic aldehyde by a two-step method of lignocellulose hydrolysis residue, can solve the problems of difficult direct modification and utilization, low chemical reaction activity, etc., and achieves increased reaction activity points and simple operation process. , the effect of reducing steric hindrance

Inactive Publication Date: 2013-04-24
HUAIYIN TEACHERS COLLEGE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As a natural high molecular polymer, the molecular weight of lignin is polydisperse, the chemical reactivity is low, and it is difficult to directly modify and utilize

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Embodiment 1: prepare aromatic aldehyde according to the following steps

[0022] (1) Hydrolysis residue: the corn cob is hydrolyzed by acid method to remove most of the hemicellulose, and then the cellulose and residual hemicellulose are removed by enzymatic hydrolysis to obtain the corn cob hydrolysis residue;

[0023] (2) Lignin activation reaction: Add in stainless steel reaction kettle

[0024] Solid corn cob hydrolysis residue, add water, H 2 o 2 , FeSO 4 and ethylenediaminetetraacetic acid (EDTA), so that the concentration of lignin is 20%, H 2 o 2 Concentration is 10%, FeSO 4 The concentration is 5.0%, the concentration of ethylenediaminetetraacetic acid (EDTA) is 1.0%, adjust the pH of the system to 4.0, start stirring, the rotation speed is 500rpm, and react at 100°C for 10min;

[0025] (3) Lignin catalyzed oxidative degradation reaction: add NaOH and CuSO to the reactor 4 , so that the concentration of NaOH is 20%, the catalyst CuSO 4 The concentratio...

Embodiment 2

[0027] Embodiment 2: prepare aromatic aldehyde according to the following steps

[0028] (1) Hydrolysis residue: corn stalks are hydrolyzed by sulfuric acid or hydrochloric acid to prepare furfural, and the furfural residue is the hydrolysis residue;

[0029] (2) Lignin activation reaction: add furfural slag to the stainless steel reaction kettle, add water, H 2 o 2 , FeSO 4 and ethylenediaminetetraacetic acid (EDTA), so that the concentration of lignin is 1.0%, H 2 o 2 Concentration is 1.0%, FeSO 4 The concentration is 0.1%, the concentration of ethylenediaminetetraacetic acid (EDTA) is 0.01%, adjust the pH of the system to 7.0, start stirring, the rotation speed is 100rpm, and react at 40°C for 60min;

[0030] (3) Lignin catalyzed oxidative degradation reaction: add NaOH and CuSO to the reactor 4 , so that the concentration of NaOH is 1.0%, the catalyst CuSO 4 The concentration is 0.1%, start heating, after the temperature rises to 200°C, 0.5MPa of oxygen is introduce...

Embodiment 3

[0032] Embodiment 3: prepare aromatic aldehyde according to the following steps

[0033] (1) Hydrolysis residue: the bagasse obtained by enzymatic hydrolysis to remove most of the cellulose and hemicellulose is the hydrolysis residue;

[0034] (2) Lignin activation reaction: add bagasse to a stainless steel reaction kettle, add water, H 2 o 2 , FeSO 4 and ethylenediaminetetraacetic acid (EDTA), so that the concentration of lignin is 10%, H 2 o 2 Concentration is 5.0%, FeSO 4 The concentration is 2.0%, the concentration of ethylenediaminetetraacetic acid (EDTA) is 0.2%, adjust the pH of the system to 3.0, start stirring, the rotation speed is 200rpm, and react at 80°C for 50min;

[0035] (3) Lignin catalyzed oxidative degradation reaction: add NaOH and CuSO to the reactor 4 , so that the concentration of NaOH is 8%, the catalyst CuSO 4The concentration is 1.0%, start heating, after the temperature rises to 180°C, 0.8MPa of oxygen is introduced to maintain the total press...

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Abstract

The invention discloses a method for preparing aromatic aldehyde from lignocellulose hydrolysis residue by a two-step process. The method comprises the following steps of: based on the lignocellulose hydrolysis residue as a raw material, degrading lignin by two-step reaction in a reaction kettle to produce an aromatic aldehyde compound, wherein the first reaction step is activating the lignin by utilizing strong oxidability of a fenton reagent in a proper pH range, and the second reaction step is catalytically oxidizing the lignin by using a copper sulfate catalyst and filling an oxidative gas under an alkaline condition to degrade to produce the aromatic aldehyde compound. By adopting the two-step reaction of the activation and the catalytic oxidization, the method has the characteristics that the lignin in the hydrolysis residue is efficiently degraded into the aromatic aldehyde compound, and the addition value of the hydrolysis residue used as the industrial waste is improved.

Description

technical field [0001] The invention belongs to the technical field of biomass chemical industry, and in particular relates to a two-step method for preparing aromatic aldehydes from lignocellulose hydrolysis residues. Background technique [0002] While using the cellulose component in lignocellulose in industrial production, a large amount of lignin will be produced as waste. One is the lignin produced by the paper industry, which is large in amount and seriously polluted; the other is produced by the hydrolysis (sugar) industry. The amount and pollution of lignin are relatively small. [0003] The basic chemical structure of lignin is composed of phenylpropane structural units, and contains a variety of active functional groups, mainly including methoxy (-OCH 3 ), ether bond (-O-), carboxyl group (-COOH), carbon-carbon double bond (C=C), benzyl alcohol hydroxyl group (Ph-CH 2 OH), phenolic hydroxyl group (Ph-OH), carbonyl group (C=O) and benzene ring, etc. If lignin ca...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07G1/00C07C47/58C07C47/565C07C47/575C07C45/51
Inventor 徐继明吴真徐宁胡梅吕金顺戴本林熊鹏
Owner HUAIYIN TEACHERS COLLEGE
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