Method for preparing sulfated bagasse xylan

A technology of sulfation and xylan, which is applied in the field of preparation of sulfated bagasse xylan derivatives, can solve the problems of narrow application range and few types, and achieve stable product quality, high raw material utilization rate, and synthetic process easy to control effects

Inactive Publication Date: 2011-01-12
GUILIN UNIVERSITY OF TECHNOLOGY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to provide a method for preparing sulfated bagasse xylan derivatives in or...

Method used

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  • Method for preparing sulfated bagasse xylan
  • Method for preparing sulfated bagasse xylan
  • Method for preparing sulfated bagasse xylan

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Embodiment

[0019] Dehydrate 40mL of pyridine with 5A molecular sieves, cool in an ice-salt bath, then slowly drop 2mL of chlorosulfonic acid placed in a constant pressure separatory funnel into the pyridine, controlling the flow rate and stirring speed; when a white solid appears in the reaction flask, Add anhydrous formamide to aid dissolution, and continue to stir for 2 hours after the addition of chlorosulfonic acid; move it into a constant temperature water bath adjusted to a temperature of 50°C, and add sulfamic acid as a catalyst accounting for 1% of xylan mass fraction to the reaction system , then add 1g of bagasse xylan, esterify for 3 hours; add excess acetone and let it stand for 2h, pour out the supernatant and add 80% methanol solution by volume, suction filter after sufficient precipitation, collect the precipitate, and repeat washing several times. Obtain the primary product of sulfated bagasse xylan; wash twice with 80% ethanol aqueous solution by volume, then wash and deh...

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Abstract

The invention discloses a method for preparing sulfated bagasse xylan. The method comprises the following steps of: dehydrating and cooling pyridine; dripping chlorosulfonic acid into the pyridine, wherein the volume ratio of the pyridine to the chlorosulfonic acid is between 15 and 25; when white solid appears in the reaction flask, adding anhydrous formamide to help dissolving, and continuing stirring for 1 to 2 hours; transferring the obtained solution into a constant-temperature water bath kettle, adding amino-sulfonic acid and bagasse xylan into the water bath kettle, and esterifying for 2.5 to 4 hours, wherein the ratio of the volume of the chlorosulfonic acid to the mass of the xylan is 1.2-2.0:0.7-1.5; adding excessive acetone and standing for 2 hours; pouring out the supernatant and adding the mixed solution of 75 to 90 volume percent methanol and water; depositing and then filtering; collecting the deposit and washing for multiple times; washing the deposit with the aqueous solution of ethanol at least once; washing and dehydrating with acetone; and drying in vacuum at 50 DEG C for 6 hours. The method has the characteristics of high substitution degree, high utilization rate of raw materials, easy control on synthesis process, simple post-treatment process and stable product quality; moreover, the prepared sulfated bagasse xylan has high water solubility.

Description

technical field [0001] The invention relates to a preparation method of sulfated bagasse xylan derivatives. Background technique [0002] Xylan is the main component of hemicellulose in plant fibers that widely exist in nature. It is composed of xylose connected by β-1, 4 glycosidic bonds. It has a special chemical structure, such as branched and amorphous composition. Different types of monosaccharides (heteropolysaccharides) and different types of functional groups (such as hydroxyl, acetyl, carboxyl, methoxy), etc., have unique biological activities and physiological functions, and have broad development prospects. [0003] After xylan is modified by esterification, the conformation of xylan has changed greatly, and the change of conformation is often the decisive factor for the change of physicochemical properties and biological activities. Xylan derivatized by esterification shows more biological activities, such as water solubility, positive charge, hydrophobicity, th...

Claims

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Application Information

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IPC IPC(8): C08B37/14
Inventor 李和平牛春花何丽霞袁庆广鲁勇李东旭
Owner GUILIN UNIVERSITY OF TECHNOLOGY
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