Method for assisting wood delignification through microwave-hot alkali pretreatment

A technology of hot alkali pretreatment and microwave treatment, applied in the field of pulping and papermaking, can solve the problems of long delignification time and poor chemical liquid permeability, and achieve the effect of enhancing lyophilicity and increasing porosity

Inactive Publication Date: 2020-09-18
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This delignification process does not carry out pretreatment before wood chip delignification, so that the liquid permeability of wood chips is poor. Therefore, in order to achieve a more ideal delignification effect, the delignification time is relatively long, and Long lignin time is detrimental to maintaining the structural integrity of wood chips

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Wood pretreatment:

[0020] 1) Using fast-growing poplar wood chips with a specification of 30mm×30mm×2mm as raw material, adjust the moisture content of the chips to 80% with 6wt% NaOH solution in a constant temperature and humidity chamber;

[0021] 2) Adjust the power of the microwave oven to 500w, and place the wood with a moisture content of 80% in the microwave oven for 120s to obtain pretreated wood;

[0022] Delignification treatment:

[0023] 3) After the pretreated wood is washed to neutral by deionized water, it is placed in 5wt%NaClO 2 solution, and adjust the pH of the solution to 4 with glacial acetic acid; put NaClO 2 The wood in the solution is placed in a 90°C constant temperature water bath and heated for 2 hours to perform delignification treatment to obtain delignified wood;

[0024] 4) The delignified wood is washed with deionized water until neutral and then dried.

Embodiment 2

[0026] Wood pretreatment:

[0027] 1) Using fast-growing poplar wood chips with a specification of 30mm×30mm×2mm as raw material, adjust the moisture content of the chips to 60% with 5wt% NaOH solution in a constant temperature and humidity chamber;

[0028] 2) Adjust the power of the microwave oven to 600w, place wood with a moisture content of 60% in the microwave oven for 120s to obtain pretreated wood;

[0029] Delignification treatment:

[0030] 3) After the pretreated wood is washed to neutral by deionized water, it is placed in 3wt%NaClO 2 solution, and adjust the pH of the solution to 4 with glacial acetic acid; put NaClO 2 The wood in the solution was heated in a constant temperature water bath at 70°C for 2 hours to perform delignification treatment to obtain delignified wood;

[0031] 4) The delignified wood is washed with deionized water until neutral and then dried.

Embodiment 3

[0033] Wood pretreatment:

[0034] 1) Using fast-growing poplar chips with a specification of 30mm×30mm×2mm as raw material, adjust the moisture content of the chips to 100% with 9wt% NaOH solution in a constant temperature and humidity chamber;

[0035] 2) Adjust the power of the microwave oven to 600w, and place the wood with a moisture content of 100% in the microwave oven for 120s to obtain pretreated wood;

[0036] Delignification treatment:

[0037] 3) After the pretreated wood is washed to neutral by deionized water, it is placed in 7wt%NaClO 2 solution, and adjust the pH of the solution to 3 with glacial acetic acid; put NaClO 2 The wood in the solution is placed in a 90°C constant temperature water bath and heated for 2 hours to perform delignification treatment to obtain delignified wood;

[0038] 4) The delignified wood is washed with deionized water until neutral and then dried.

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PUM

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Abstract

The invention discloses a method for assisting wood delignification through microwave-hot alkali pretreatment. The method comprises the following steps: (1) wood chip pretreatment: adjusting the watercontent of prepared wood chips to 60%-100% through alkali liquor; and then carrying out microwave treatment; and 2) washing the pretreated wood chips with deionized water until the wood chips are neutral, putting the wood chips into a NaClO2 solution, adjusting the pH value of the solution with glacial acetic acid, and heating for delignification treatment. According to the method, the wood is pretreated with microwave-alkali liquor, so that the delignification treatment time of the wood can be shortened, and the treatment efficiency can be improved.

Description

technical field [0001] The invention relates to pulping and papermaking technology, in particular to a pretreatment method for wood delignification. Background technique [0002] Wood is a rich, environmentally friendly and renewable green structural material. The functional materials prepared with it as the base material meet the requirements of sustainable development. Among the many functional materials, delignified wood is mostly used as the base material, but The existing wood delignification process requires long delignification time and low efficiency. The existing delignification process is to place wood chips in sodium chlorite with a mass fraction of 2% to 5%, add glacial acetic acid to adjust the pH to 4 to 5, and treat at about 90°C for 12 hours. This delignification process does not carry out pretreatment before wood chip delignification, so that the liquid permeability of wood chips is poor. Therefore, in order to achieve a more ideal delignification effect, t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D21C5/00D21B1/02D21C9/10B27K5/00
CPCB27K5/0055D21B1/02D21B1/021D21C5/00D21C9/10
Inventor 林涛王忠祥殷学风范晶张能王俊张聪魏潇瑶
Owner SHAANXI UNIV OF SCI & TECH
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