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Pulping method of reed organic solvent slurry by pre-extracting hemicellulose and product thereof

A technology of hemicellulose and organic solvent is applied in the field of reed organic solvent pulping method and its products, which can solve the problems of poor economic benefit and single target product, and achieve the effect of improving pulping efficiency.

Inactive Publication Date: 2015-10-21
CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The target products of these two production methods are single, and the economic benefits are poor
At present, there is no technical plan for the comprehensive utilization of reeds that fully considers the extraction of hemicellulose and the preparation of organic solvent pulp

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] (1) The reeds are prepared by dry and wet methods. The reeds are evenly cut off, and the light dust is removed by a winnowing machine, and then fine impurities such as sediment and reed pith are screened out by a round sieve, and finally the reed leaves and reed film are removed by a dust collector. Reed pieces with a length of 20-40mm and a pass rate of more than 85% are washed with water to further remove impurities, and the dryness of the reed after dehydration is not less than 35%.

[0032] (2) Pre-hydrolysis: carried out in a cooking pot, the process conditions are: for the absolute dry reed raw material, the solid-to-liquid ratio is 1:4, the hydrolysis temperature is 160°C, the pressure is the saturated steam pressure at the corresponding temperature, and the holding time is 180°C. Minutes, the final pH of hydrolysis was 4.3.

[0033] (3) Liquid-solid separation and washing, the filtrate was collected to obtain an extract, and the extraction rate of reed pentose w...

Embodiment 2

[0037] (1) dry and wet method of reed is prepared, with embodiment 1.

[0038] (2) Pre-hydrolysis: carried out in a cooking pot, the process conditions are: for the absolute dry reed raw material, the solid-liquid ratio is 1:5, the hydrolysis temperature is 170°C, the pressure is the saturated steam pressure at the corresponding temperature, and the holding time is 60°C. Minutes, the final pH of hydrolysis was 4.1.

[0039] (3) Liquid-solid separation and washing, collecting the filtrate to obtain an extract: the extraction rate of reed pentose is 36.5%, and the operation method is the same as that in Example 1.

[0040](4) Cooking and pulping of reed residue: for the absolute dry reed residue, the amount of butanediol used is butanediol: water=60% (volume percentage), and the liquid ratio is reed raw material: liquid=1: 5 (kg / l ), rapid heating, cooking temperature of 180°C, and holding time of 80 minutes, so that the reeds are fully dissolved to obtain pulp.

[0041] (5) W...

Embodiment 3

[0043] (1) dry and wet method of reed is prepared, with embodiment 1.

[0044] (2) Pre-hydrolysis: carried out in a cooking pot, the process conditions are: for the absolute dry reed raw material, the solid-liquid ratio is 1:6, the hydrolysis temperature is 180°C, the pressure is the saturated steam pressure at the corresponding temperature, and the holding time is 40°C. Minutes, the final pH of hydrolysis was 3.8.

[0045] (3) Liquid-solid separation and washing, collecting the filtrate to obtain an extract, the extraction rate of reed pentose is 37.3%, and the specific operation method is the same as that in Example 1.

[0046] (4) Cooking and pulping of reed residue: for the absolute dry reed residue, the amount of butanediol used is butanediol: water=50% (volume percentage), and the liquid ratio is reed raw material: liquid=1: 5 (kg / l ), rapid heating, cooking temperature 180 ° C, holding time 60 min, so that reeds are fully dissolved to obtain pulp.

[0047] (5) Washing...

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Abstract

The invention relates to a pulping method of a reed organic solvent slurry by pre-extracting hemicellulose and a product thereof. The method includes: reed preparation, prehydrolysis, solid-liquid separation and washing, and pulp preparation by a high boiling alcohol solvent method from residues. The method can obtain a reed pulp and a reed extracting liquid which can be used for preparation of saccharide compounds or ethanol. Compared with the reed raw material which is not subjected to hemicellulose extraction by hydrolysis, the Kappa number of the slurry obtained under the same pulping conditions is reduced by 5-8 units after the reed is subjected to prehydrolysis. By prehydrolysis to extract hemicellulose before pulping, the problem of high sugar content in a high boiling alcohol solvent recovery system can be solved, and effective utilization of all components of wood biomass raw materials also can be realizes, so that the added value of a byproduct is improved, and the economic costs of high boiling solvent alcohol pulping are balanced.

Description

technical field [0001] The invention relates to the fields of chemical engineering and reed pulping technology, in particular to a reed organic solvent pulping method and a product thereof by pre-extracting hemicellulose. Background technique [0002] my country's timber resources are very scarce, and the bottleneck of papermaking raw materials is prominent. Reed is an important non-wood papermaking raw material with high cost performance. Therefore, the scientific and rational use of non-timber raw materials such as reeds can solve the problem of insufficient raw materials for papermaking in my country. [0003] Organic solvent pulping is a pollution-free and clean pulping method, and high-boiling alcohol solvent pulping belongs to the category of organic solvent pulping methods. Document 1 Preliminary Study on Bagasse Pulping with High Boiling Alcohol Solvent Method -- "China Papermaking", Issue 06, 2008, Document 2 Preparation of Straw Pulp and Lignin by High Boiling Al...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D21C5/00D21C3/22
CPCC08B37/00C08B37/0057D21C1/02D21C3/20D21C9/02
Inventor 刘艳兰林本平马乐凡邓思任薛治宝
Owner CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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