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Method for preparing xylan and high-purity lignin by taking gramineous plants as raw materials

A technology of gramineous plants and plant raw materials, applied in the field of dissolving pulp preparation

Pending Publication Date: 2021-04-20
ZHEJIANG FORESTRY UNIVERSITY
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Problems solved by technology

[0003] Aiming at the above-mentioned deficiencies in the prior art, the purpose of the present invention is to provide a method for preparing xylan and high-purity lignin from gramineous plants, and the technical problem to be solved is to design a simple, pollution-free prehydrolysis The method is to use

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  • Method for preparing xylan and high-purity lignin by taking gramineous plants as raw materials

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[0032]Example 1-8

Example Embodiment

[0033]Example 1 The preparation process is:

[0034]Preparation: The bamboo pieces are raw materials, dried into natural water content of 8% -12%, soaking in 0.5% NaOH aqueous solution;

[0035]Pred - hydrolysis: Add 1 part by weight of bamboo tablets to the reactor, add 10 parts of 0.5% NaOH aqueous solution, pretreatment of 90 minutes under 160 ° C, and cool to room temperature after the pre-treatment, and 60 mesh sieve separation prehydrolysis and material sheet;

[0036]Separation of lignin: The pH is adjusted to 2 in 4M hydrochloric acid, and the lignin is precipitated, centrifuged, and the sealed package is obtained, and the yield of refined lignin is 6.5%;

[0037]Isolation of xylosan: The supernatant after lignin was separated. The pH was adjusted to 7 with 4 M NaOH. After concentrating 10-30 times of ethanol, the xantan is precipitated, centrifuged, dry after drying Packaging, refined glycosaccharide is 4.2%; after evaporation of ethanol, recycling.

[0038]Example 2-8 Preparation Procedu...

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Abstract

The invention discloses a method for preparing xylan and high-purity lignin by using gramineous plants as raw materials, which comprises the following steps: (1) pre-hydrolysis: soaking the gramineous plant raw materials in dilute alkali liquor for 0-48 hours, and carrying out pre-hydrolysis treatment: controlling the mass ratio of the gramineous plant raw materials to the dilute alkali liquor to be 1: (2-15), carrying out pre-hydrolysis at 130-170 DEG C for 30-90 minutes, cooling to room temperature after completion, and carrying out solid-liquid separation; (2) lignin separation: adjusting the pH value of the pre-hydrolysate to 1-3 with an acid solution to precipitate lignin, and carrying out solid-liquid separation to obtain the lignin; and (3) separation of xylan: adjusting the pH value of the clear liquid separated in the step (2) to 6-9 by using alkali liquor, concentrating, dripping into 10-30 times of ethanol to precipitate the xylan, and carrying out solid-liquid separation to obtain the xylan. According to the method, the gramineous plants are selected as the raw materials, dilute alkali liquor is used as prehydrolysate, the xylan and the high-purity lignin are obtained at the same time, and a new way for high-valued utilization of cellulose, hemicellulose and lignin, namely'three elements', is created.

Description

technical field [0001] The invention relates to the technical field of dissolving pulp preparation, in particular to a method for preparing xylan and high-purity lignin from gramineous plants. Background technique [0002] There are two processes for the preparation of dissolving pulp, pre-hydrolysis sulfate method and acid sulfite method. Generally speaking, raw materials with high hemicellulose content and high resin content must be cooked by prehydrolysis kraft method to obtain qualified pulp, and raw materials with low hemicellulose content can be cooked by acid sulfite method. Compared with the sulfite method, the pre-hydrolysis sulfate method has stronger adaptability to raw materials, and the produced dissolving pulp has high α-cellulose content, high black liquor alkali recovery rate, and less environmental pollution. It combines the two methods of sulfate method and sulfite method. Advantages of this pulping method. Therefore, most enterprises adopt the pre-hydrol...

Claims

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Application Information

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IPC IPC(8): D21C5/00D21C3/02C08B37/14C08H7/00
Inventor 金贞福邵金力
Owner ZHEJIANG FORESTRY UNIVERSITY
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