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Quaternization xylan, preparation method via semi-dry process and application of quaternization xylan

A technology of xylan and quaternization, which is applied to other methods of inserting foreign genetic materials, addition of retention aids, addition of water-repellent agents, etc., can solve the problem of low molecular weight of modified xylan, unfavorable products, and increased production costs and other problems, to achieve the effect of simple preparation process, easy industrialization, and expansion of industrial application

Inactive Publication Date: 2013-07-24
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

And the method for preparing quaternary ammonium type hemicellulose by semi-dry method has not yet been reported
[0005] Many scholars at home and abroad focus on the preparation and application of quaternized xylan with high degree of substitution. The preparation of quaternized xylan with high degree of substitution often uses organic solvents or alkaline aqueous solutions. The addition of organic solvents and the recovery Utilization will undoubtedly increase the preparation cost, and the modified xylan prepared by the alkaline aqueous solution system has a low molecular weight, and the xylan will be seriously degraded during the reaction process, which is unfavorable to the product.

Method used

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  • Quaternization xylan, preparation method via semi-dry process and application of quaternization xylan
  • Quaternization xylan, preparation method via semi-dry process and application of quaternization xylan
  • Quaternization xylan, preparation method via semi-dry process and application of quaternization xylan

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Experimental program
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Embodiment 1

[0027] (1) 1.0g xylan (beech xylan isolated from beech wood, with a molecular weight of 35179mol / g, not purified before use) was dissolved in 1.5ml of 4% NaOH solution at 20°C Alkalization for 40 minutes;

[0028] (2) Add 2 g of 3-chloro-2-hydroxypropyltrimethylammonium chloride to the mixed solution obtained in step (1), mix well, and place it at 90° C. for 3 hours;

[0029] (3) The product obtained in step (2) was cooled to room temperature, washed once with 50 mL of 70% ethanol, twice with 50 mL of 95% ethanol, and dried at 55° C. for 24 hours to obtain quaternized xylan. figure 1 IR spectrograms of xylan (spectrum a) and quaternized xylan (spectrum b); figure 1 It can be seen that the ether bond is at 1045cm -1 The absorption peak at 1043cm is significantly higher than that of unmodified xylan -1 The absorption peak is large at 1479cm -1 The absorption peak at -CH 2 The signal peak and the methyl group on the substituent. at 1411cm -1 The signal peaks at are generat...

Embodiment 2

[0038] (1) 1.0g xylan (beech xylan isolated from beech wood, with a molecular weight of 38727mol / g, without purification) was dissolved in 1.5ml of NaOH alkali solution with a mass concentration of 10%. 20min;

[0039] (2) Add 4g of 3-chloro-2-hydroxypropyltrimethylammonium chloride to the product obtained in step (1), mix well, and place it at 70°C for 5 hours;

[0040] (3) The product obtained in step (2) was cooled to room temperature, washed once with 50 mL of 70% methanol, twice with 50 mL of 95% ethanol, and dried at 60° C. for 20 h to obtain quaternized xylan. figure 2 NMR spectra of xylan (spectrum b) and quaternized xylan (spectrum a). Compared with xylan (spectrum b), the NMR spectrum a of the modified xylan has a new signal peak, and the strong signal peak at δ56.7 is the C of the quaternary ammonium group. δ (N + -CH 3 ), corresponding to C at δ68.5 β (HOH) and C γ (CH 2 -N + ) signal peak, the weak signal peak at δ73.6 is C α (CH 2 )produced. It can be...

Embodiment 3

[0043] (1) 1.0g xylan (beech xylan isolated from beech wood, molecular weight 32461mol / g, without purification) was dissolved in 1.5ml of NaOH solution with a mass concentration of 24%, and alkalized at 20°C 10min;

[0044](2) Add 8g of 3-chloro-2-hydroxypropyltrimethylammonium chloride to the routine obtained in step (1), mix well, and place it at 50°C for 10h;

[0045] (3) The product obtained in step (2) was cooled to room temperature, washed once with 50 mL of 70% methanol, twice with 50 mL of 95% ethanol, and dried at 50° C. for 30 h to obtain quaternized xylan. image 3 NMR spectra of xylan (spectrum c) and quaternized xylan (spectrum b). Compared with the xylan nuclear magnetic spectrum (c), the NMR spectrum b of the modified xylan has a new signal peak, and the strong signal peak at δ56.7 is the C of the quaternary ammonium group. δ (N + -CH 3 ), corresponding to C at δ68.5 β (HOH) and C γ (CH 2 -N + ) signal peak, the weak signal peak at δ73.6 is C α (CH 2 )...

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Abstract

The invention discloses a quaternization xylan, preparation method via a semi-dry process and an application of the quaternization xylan. The preparation method disclosed by the invention comprises the following steps of: firstly, dissolving xylan in an alkaline solution and alkalinizing for 10-40 minutes at temperature of 20-40DEG C; adding the acquired mixture solution into a quaternization reagent, uniformly mixing, placing in a drying oven and reacting for 2-10 hours at temperature of 50-90DEG C, wherein the mass ratio of the quaternization reagent to the xylan is (1-8):1; and cooling the acquired product, washing the product by using lower alcohol, subsequently filtering and drying to acquire the quaternization xylan, wherein the lower alcohol is methyl alcohol, ethanol or propyl alcohol. The preparation method disclosed by the invention is simple in process, easily controllable in reaction conditions, good in operability and low in cost; and the prepared quaternization xylan has a degree of substitution of 0.10-0.60 and a molecular weight of 21730-32728g / mol, and can be applied to papermaking and pharmaceuticals industries as a papermaking additive and a DNA (Deoxyribonucleic Acid) vector.

Description

technical field [0001] The invention relates to a xylan, in particular to a quaternized xylan and its semi-dry preparation method and application, and belongs to the technical field of chemical products and their preparation. Background technique [0002] Hemicellulose is a class of heteropolysaccharides that exist together with cellulose and lignin in plant cell walls. It mainly comes from trees, straw, bagasse, bamboo, reeds, corncobs and other higher plants. Plants around the world produce 3.5×10 hemicellulose per year 10 There are so many t. Hemicellulose is one of the most abundant and cheapest renewable resources on earth, and it is an inexhaustible renewable resource in nature. Due to its wide range of sources, biodegradability, biocompatibility, and special physiological activity, hemicellulose will become one of the main chemical raw materials in the future, and has positive significance for the sustainable and healthy development of industry and agriculture. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08B37/14D21H17/24D21H21/10D21H21/16D21H21/18C12N15/87
Inventor 任俊莉孔维庆孙润仓王帅阳彭锋
Owner SOUTH CHINA UNIV OF TECH
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