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Pulping method by catalysis of low boiling point solvent with diluted acid generated from xylose residue and furfural residue

A low-boiling-point solvent and furfural slag technology, applied in the field of papermaking, can solve the problems of high-boiling alcohol with high boiling point and high recovery energy consumption, and achieve the effects of reducing waste liquid discharge, simple pulping method, and easy industrial scale-up production

Active Publication Date: 2015-03-18
GUANGZHOU INST OF ENERGY CONVERSION - CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] High-boiling alcohol solvent pulping uses high-boiling point alcohols as organic solvents to cook and dissolve lignin to obtain fibers and lignin for papermaking. At present, the main high-boiling alcohols used are butanediol, propylene glycol, ethylene glycol, Glycol and tetrahydrofurfuryl alcohol, polyethylene glycol, polypropylene glycol, etc., but high-boiling alcohols have high recovery energy consumption due to their relatively high boiling points

Method used

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  • Pulping method by catalysis of low boiling point solvent with diluted acid generated from xylose residue and furfural residue
  • Pulping method by catalysis of low boiling point solvent with diluted acid generated from xylose residue and furfural residue
  • Pulping method by catalysis of low boiling point solvent with diluted acid generated from xylose residue and furfural residue

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Experimental program
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Embodiment 1

[0024] Embodiment 1: Xylose residue pulping

[0025] According to the process parameters shown in Table 1, the xylose residue after producing xylose will be put into 5 liters of reactors equipped with cooling coils by using corncobs as raw materials, adding ethanol aqueous solution, and desorbing under certain temperature and pressure. Lignin cooking reaction. After reacting for a certain period of time, pass cooling water into it to cool rapidly to 40-90°C, and filter the reaction product. After filtering, wash the filter residue twice with ethanol aqueous solution according to the solid-to-liquid ratio of 2-10, and filter. The filter residue is prepared from xylose residue. Cellulose coarse slurry; after the filtrate and washing liquid are mixed, the ethanol is distilled off, and the remaining raffinate is filtered, and the filter residue is purified lignin, which can be used as a raw material for other products. The test results are shown in Table 1.

[0026] Table 1 Expe...

Embodiment 2

[0028] Embodiment 2: pulping of furfural slag

[0029] According to the process parameters shown in Table 2, the furfural slag produced from furfural by using corncobs as raw material is put into a 5 liter reaction kettle equipped with a cooling coil, and the solvent aqueous solution is added to carry out delignification at a certain temperature and pressure. Vegetarian cooking reaction. After reacting for a certain period of time, pour cooling water into it to cool rapidly to 40-90°C, and filter the reaction product. After filtering, wash the filter residue with an aqueous solvent solution according to the solid-to-liquid ratio of 2-10, and filter. The filter residue is cellulose crude prepared from furfural slag. Slurry; After the filtrate and washing liquid are mixed, the solvent is distilled off, and the remaining raffinate is filtered, and the filter residue is purified lignin, which can be used as a raw material for other products.

[0030] Table 2 Experimental process ...

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Abstract

The present invention provides a pulping method by catalysis of a low boiling point solvent with a diluted acid generated from xylose residue and furfural residue. According to the method, acid solid wastes generated from xylose production and furfural production are adopted as raw materials, the residual acid in the xylose residue and the furfural residue is adopted as a catalyst, a solvent is adopted as a pulping solvent, a low temperature and a short reaction time are adopted to carry out pulping, and steps of steaming boiling, filtering, washing, distilling, filtering, and the like are performed to achieve pulping by catalysis of the low boiling point solvent with the diluted acid generated from the xylose residue and the furfural residue, wherein the boiling point of the solvent is less than 100 DEG, or the solvent and water can form an azeotrope with the boiling point less than 100 DEG C. The solvent used for pulping can be recovered by distillation, and the extracted lignin can be used as a substitute of a phenol formaldehyde adhesive in plywood. The method of the present invention has advantages of reasonable and practicable process, easy operation, low pollution, low pulping cost, high pulping yield, and the like.

Description

technical field [0001] The invention relates to the technical field of papermaking, in particular to a dilute acid-catalyzed low-boiling-point solvent pulping method for xylose residue and furfural residue. technical background [0002] Xylose residue and furfural residue are acidic solid wastes after producing xylose and furfural using corncobs as raw materials, and their main components are cellulose and lignin. Xylose residue and furfural residue are high-quality lignocellulose resources with a cellulose content of more than 50%. Lignocellulose is the most potential renewable energy accumulated on the earth. How to rationally utilize and develop this resource has received great attention internationally, and many countries in the world have invested a lot of money in research on its utilization. In recent years, research on biomass utilization has mostly focused on materials such as corn straw, rice straw, and pine wood chips, while less research has been done on lignoc...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D21C5/00
Inventor 陈新德熊莲陈雪芳张海荣黄超郭海军罗彩容
Owner GUANGZHOU INST OF ENERGY CONVERSION - CHINESE ACAD OF SCI
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