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Lignocellulose pulping method based on acidic eutectic solvent

A technology of low eutectic solvent and lignocellulose, which is applied in cellulose raw material pulping, natural cellulose pulp/paper, fiber raw material processing, etc., can solve the problems of strict equipment requirements, large chemical consumption and high energy consumption, Achieving the effect of lower temperature, lower cost and reduced energy consumption requirements

Pending Publication Date: 2022-02-25
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a clean pulping method using an acidic deep eutectic solvent at normal pressure and low temperature to solve the problems of high energy consumption, strict equipment requirements, large amount of chemicals and subsequent pollution treatment costs in the current pulping process high problem

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] A lignocellulose pulping method based on an acidic deep eutectic solvent, comprising the following steps:

[0025] Benzyltriethylammonium chloride and formic acid were mixed at a molar ratio of 1:5, and stirred by magnetic force at 25°C to form a uniform transparent liquid deep eutectic solvent. Cut the eucalyptus veneer into 2-3cm long, 1-2cm wide, and 0.5cm thick wood chips, and wash the sediment on the surface with clean water. After air-drying for 3 days in an indoor environment, measure its moisture and place it in a sealed bag for later use.

[0026] Weigh 10.00g of eucalyptus veneer wood chips (dry) and 100g of deep eutectic solvent respectively, and mix them into an atmospheric pressure reactor for cooking reaction. The cooking time is 1.5h, and the cooking temperature is 130°C. After the cooking is completed, add 100ml of water to dilute the solid-liquid mixture, then use a 200-mesh slurry bag to filter the mixture to obtain the deep eutectic solvent and coarse...

Embodiment 2

[0028] A lignocellulose pulping method based on an acidic deep eutectic solvent, comprising the following steps:

[0029] Benzyltriethylammonium chloride and formic acid were mixed at a molar ratio of 1:5, and stirred by magnetic force at 25°C to form a uniform transparent liquid deep eutectic solvent. Cut the eucalyptus veneer into 2-3cm long, 1-2cm wide, and 0.5cm thick wood chips, and wash the sediment on the surface with clean water. After air-drying for 3 days in an indoor environment, measure its moisture and place it in a sealed bag for later use.

[0030] Weigh 10.00g of eucalyptus veneer wood chips (dry) and 100g of deep eutectic solvent respectively, and mix them into an atmospheric pressure reactor for cooking reaction. The cooking time is 2.0h, and the cooking temperature is 130°C. After cooking, add 200ml ethanol to dilute the solid-liquid mixture, then use a 200-mesh slurry bag to filter the mixture to obtain the deep eutectic solvent and coarse pulp, and wash th...

Embodiment 3

[0032] A lignocellulose pulping method based on an acidic deep eutectic solvent, comprising the following steps:

[0033] Benzyltriethylammonium chloride and formic acid were mixed at a molar ratio of 1:5, and stirred by magnetic force at 25°C to form a uniform transparent liquid deep eutectic solvent. Cut the eucalyptus veneer into 2-3cm long, 1-2cm wide, and 0.5cm thick wood chips, and wash the sediment on the surface with clean water. After air-drying for 3 days in an indoor environment, measure its moisture and place it in a sealed bag for later use.

[0034] Weigh 10.00g of eucalyptus veneer wood chips (dry) and 100g of deep eutectic solvent respectively, mix them and add them to the normal pressure reactor for cooking reaction, the cooking time is 2.5h, the cooking temperature is 130°C, and the stirring speed is 200r / min. After the cooking is completed, add 200ml of acetone to dilute the solid-liquid mixture, then use a 200-mesh slurry bag to filter the mixture to obta...

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Abstract

The invention belongs to the technical field of pulping processes, and discloses a lignocellulose pulping method based on an acidic eutectic solvent. The pulping method mainly comprises the following steps: slicing and dedusting lignocellulose; mixing lignocellulose and a deep eutectic solvent, adding the obtained mixture into a normal-pressure reaction kettle, and performing cooking reaction; after the cooking is finished, adding a washing solution to dilute the mixture, carrying out solid-liquid separation to obtain crude pulp, and washing the crude pulp by using the washing solution again; and finally, screening by using a pulp screening machine to obtain fine pulp. The fibers are effectively separated under the conditions of normal pressure and low temperature by utilizing the excellent lignin and hemicellulose removal effect of the benzyltriethylammonium chloride / formic acid, so that the energy consumption and the acid consumption required by cooking are obviously reduced, and the requirements on reaction equipment are reduced; in addition, the eutectic solvent and the washing liquid in the method can be recycled, so that the burden of subsequent pollution treatment is reduced; therefore, the method has both economic and environmental feasibility.

Description

technical field [0001] The invention belongs to the technical field of pulping technology, and in particular relates to a clean pulping method with an acidic deep eutectic solvent under normal pressure and low temperature conditions. Background technique [0002] With the rapid development of my country's social economy, the demand for paper is growing steadily. But at the same time, my country's pulping industry still has the problems of high energy consumption and high cost of subsequent pollution treatment. The development of low energy consumption, green and environmentally friendly pulping methods is the only way for the pulp and paper industry to take sustainable development. [0003] Organosolvent pulping has been extensively studied due to its excellent chemical recycling performance, among which formic acid pulping is one of the more mature methods. According to the method for producing pulp using formic acid as the main cooking chemical agent disclosed in patent ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D21C3/00D21C9/02D21D5/02D21H11/12D21H11/00
CPCD21C3/003D21C9/02D21D5/02D21H11/12D21H11/00
Inventor 徐峻张兆辉李军王斌陈克复
Owner SOUTH CHINA UNIV OF TECH
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