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Method for efficiently separating water-insoluble xylan from wood fiber material

A wood fiber material, water-insoluble technology, applied in the chemical industry, can solve the problems of high energy consumption, deep color, low production efficiency, etc., and achieve the effect of high impurity removal rate, low separation cost and cost saving

Active Publication Date: 2021-12-03
桂林古膳食品科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above-mentioned patent application publication number is CN111019015A The technical scheme disclosed in the patent literature is the research result of the inventor in the early stage of the present application, but this method first needs to go through secondary drying, which consumes a lot of energy, and secondly in the process of preparing xylan xerogel. There are high-temperature side reactions in the process, and the color is dark, which limits commercial value; finally, the xylan xerogel particles obtained by this method are hard, and it is slow to achieve full washing, and the production efficiency is not high
[0007] Theoretically, water-insoluble xylan gel particles can also be separated and recovered by sedimentation centrifugation. For example, in the invention patent CN202011041408.5 disclosed by the inventor of the present application, a method for efficiently separating lignocellulosic materials to obtain high-purity components is Water-insoluble xylan is recovered by sedimentation centrifugation separation method, but this process has strict requirements on the current industrial sedimentation centrifugation equipment and xylan extraction process, which greatly increases the separation cost, because xylan is affected by the extraction process. The influence of extraction conditions is easy to degrade, so that the extracted xylan forms a heterogeneous polysaccharide, which is in a continuous distribution state from completely insoluble to soluble, especially in pure water, which is bounded by soluble-insoluble xylan in a stable state. Milky balls or gel state exist, so this process has strict requirements on the current industrial sedimentation centrifuge equipment and xylan extraction process, which greatly increases the separation cost and weakens the role of centrifugal separation process in the purification of insoluble xylan Value

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  • Method for efficiently separating water-insoluble xylan from wood fiber material
  • Method for efficiently separating water-insoluble xylan from wood fiber material

Examples

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Effect test

Embodiment 1

[0030] A method for efficiently separating water-insoluble xylan in lignocellulosic materials, comprising the following steps:

[0031] (1) Extraction: Take 100 parts by weight of dry and mildew-free corn stalks, properly crush the corn stalks, and soak them in a sodium hydroxide solution with 8 times its weight and a mass fraction of 12% for 2 hours. The temperature is 80°C; after the leaching, solid-liquid separation is carried out by centrifugal precipitation to obtain the centrifugal heavy phase and the extract; the centrifugal heavy phase is washed twice with a sodium hydroxide solution with a mass concentration of 6%, and the solid-liquid Separating and recovering the liquid phase to obtain the lye for extracting xylan;

[0032] (2) Merge three extractions of lye, use alkali-resistant electrodialysis membrane for dealkalization treatment, recover the alkali in the xylan leaching lye, and realize the regeneration and recycling of lye; the dealkalization extract is neutral...

Embodiment 2

[0036] A method for efficiently separating water-insoluble xylan in lignocellulosic materials, comprising the following steps:

[0037] (1) Extraction: Take 100 parts by weight of dry bagasse without mildew, properly crush the bagasse, put it into 12 times its weight and soak it in a sodium hydroxide solution with a mass fraction of 8% for 4 hours, The temperature is 80-120°C; after the leaching, centrifuge and precipitate for solid-liquid separation to obtain the centrifuge heavy phase and extract; the centrifuge heavy phase is washed twice with a sodium hydroxide solution with a mass concentration of 6%, each time Separation of solid and liquid, recovery of the liquid phase, to obtain lye for xylan extraction;

[0038] (2) Merge three extractions of lye, use nanofiltration technology to recover the alkali in the xylan leaching lye, and realize the regeneration and recycling of lye; the dealkalized extract is neutralized with hydrochloric acid to a pH value of 10, this pH Th...

Embodiment 3

[0042] A method for efficiently separating water-insoluble xylan in lignocellulosic materials, comprising the following steps:

[0043] (1) Extraction: Take 100 parts by weight of the corncob raw material without mildew and dryness, crush the corncob through a silk kneading machine, put it into 10 times the amount of sodium hydroxide solution with a mass fraction of 10%, and soak for 3 hours. The temperature is 90°C; after the leaching, solid-liquid separation is carried out by centrifugal precipitation to obtain the centrifugal heavy phase and the extract; the centrifugal heavy phase is washed twice with a sodium hydroxide solution with a mass concentration of 6%, and the solid-liquid Separation; the solid finally uses a centrifuge to remove free liquid to obtain purified cellulose; recover the liquid phase to obtain xylan leaching lye;

[0044] (2) Merge three extractions of lye, use alkali-resistant electrodialysis membrane for dealkalization treatment, recover the alkali i...

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Abstract

The invention discloses a method for efficiently separating water-insoluble xylan in a wood fiber material, and belongs to the technical field of chemical engineering. The method comprises the following steps: by taking a wood fiber material as a raw material, firstly obtaining an emulsion of xylan and lignin through methods of crushing, alkali extraction, filtration, alkali recovery and neutralization; secondly, damaging the xylan milk balls through low-temperature freezing, so that the water-insoluble xylan can be gathered due to volume rejection of ice crystals in the freezing process, and meanwhile, the gathering effect is enhanced due to the interaction of hydrogen bonds formed among the water-insoluble xylan, after being unfrozen, precipitation is achieved, the lignin is still dissolved in a supernate, the lignin can be fully removed through rinsing with flowing water, and a pure water-insoluble xylan precipitation solution is obtained; and finally, drying to obtain the high-purity water-insoluble xylan. According to the method, no organic solvent is used, the separation cost is low, the impurity removal rate is high, and high-efficiency and low-cost separation of the water-insoluble xylan in the wood fiber material can be realized by adopting the method.

Description

technical field [0001] The invention belongs to the technical field of chemical industry, and in particular relates to a method for efficiently separating water-insoluble xylan in lignocellulosic materials. Background technique [0002] Xylan is the main component of hemicellulose in the cell wall of gramineous plants, accounting for about 1 / 3 of the dry weight of the cell wall. It is a polysaccharide composed of tens to hundreds of xylose molecules connected by β-(1→4) to form the main chain. kind. The 2,3C of the glycosyl of the xylan main chain is usually linked with different glycosyl groups, and heterogeneous polysaccharides with branched chains of non-sugar substituents. Xylan is the only five-carbon sugar polymer in nature, and its unique properties have irreplaceable application value in food, chemical and other fields. [0003] Xylan in plant cell walls is highly acetylated and binds to lignin through ester bonds to become a strong support material for plant cell ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08B37/14
CPCC08B37/0057C08B37/0003
Inventor 卢艺芳张永昌张永宁赖仁兴张永泰唐志强申正荣张厚瑞
Owner 桂林古膳食品科技有限公司
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