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Method for extracting cellulose nanofiber from Humulus stems

A nanofiber and cellulose technology, applied in fiber raw materials, fiber raw material processing, textiles and papermaking, etc., can solve the problems of increasing the amount of pretreatment chemicals, the difficulty of waste liquid treatment, and unfavorable environmental protection, so as to promote the progress of subsequent reactions , beneficial to the removal effect, beneficial to the removal effect

Active Publication Date: 2016-12-14
YANGZHOU UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the multi-channel process, the amount of pretreatment chemicals and the difficulty of waste liquid treatment are increased, which is not conducive to environmental protection

Method used

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  • Method for extracting cellulose nanofiber from Humulus stems
  • Method for extracting cellulose nanofiber from Humulus stems
  • Method for extracting cellulose nanofiber from Humulus stems

Examples

Experimental program
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Effect test

specific Embodiment approach 1

[0042] (1) Cutting and crushing: remove the leaves of Humulus japonicus and leave only the stems, cut them into short branches with a length of 15-20 cm, put them in an oven to dry, and then crush them with a pulverizer, and collect Humulus japonicus that passed through a 18-mesh (<1mm) sieve The stem powder is ready for use, and the diameter of the humulus stem powder (Humulus powder) is less than 0.85 mm.

[0043] (2) Acid-base treatment to remove pectin wax: weigh the Humulus japonicus powder obtained in step (1) and the concentration is 0.4% to 0.8% (WT%) hydrochloric acid aqueous solution in a mass ratio of 1:10 to 20, and Humulus japonicus The powder and the hydrochloric acid aqueous solution are placed in a high-temperature and high-pressure reactor, and the temperature is kept at 120°C, the pressure is 0.4Mpa, and the stirring speed is 900-1200rpm for 0.8-1.5h. Then adjust the pH value to 8.5-9.5 with 1 mol / L sodium hydroxide solution, stir at room temperature for 12-1...

specific Embodiment approach 2

[0049] The difference between this embodiment and specific embodiment 1 is that the high temperature and high pressure reaction temperature in steps (2), (3) and (4) is 140° C. and the pressure is 0.53 MPa.

specific Embodiment approach 3

[0050] The difference between this embodiment and specific embodiments 1 and 2 is that the high temperature and high pressure reaction temperature in steps (2), (3) and (4) is 160° C. and the pressure is 0.7 MPa.

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Abstract

The invention relates to the nano-material preparation technology field, more specifically relates to a method for extracting cellulose nanofiber from Humulus stems. The method for extracting cellulose nanofiber from Humulus stems comprises the steps of 1 cutting and smashing; 2 soda acid processing to remove pectin plain; 3 bleaching under the condition of high temperature and high pressure; 4 alkali lye processing under the condition of high temperature and high pressure; 5 ultrasonic processing; 6 refrigerating and unfreezing for filtering; and 7 freezing and drying. For the first time, the Humulus is taken as biomass raw material; the cellulose nanofiber is prepared under the condition of high temperature and high pressure in combination with ultrasonic crushing technology. In this way, the method has the advantages that the waste can be changed into valuables; the usage of a weeding pesticide is reduced; environment pollution is reduced; and the defect that the whisker aspect ratio of the cellulose nanometer prepared by strong acid hydrolysis is insufficient is solved.

Description

technical field [0001] The invention relates to the technical field of nanomaterial preparation, in particular to a method for extracting cellulose nanofibers from humulus stems. Background technique [0002] With the intensification of global energy demand and the strengthening of people's awareness of environmental protection, how to transform and efficiently utilize the most abundant natural cellulose in nature has become a research topic that countries are competing to carry out. Cellulose is an inexhaustible and inexhaustible natural polymer synthesized by plants through photosynthesis in nature. It is mainly used in textiles, papermaking, fine chemicals and other fields in traditional industries. Nanocellulose is a rod-shaped or net-shaped nanomaterial with a diameter of 1 to several hundred nanometers and a length of several hundred nanometers to tens of micrometers isolated from plant cellulose. It has high purity, high crystallinity, high poplar Modulus, high stren...

Claims

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Application Information

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IPC IPC(8): D21B1/30D21C1/04D21C1/06
CPCD21B1/303D21C1/04D21C1/06
Inventor 周骥平姜亚妮张琦朱兴龙陈冬冬衡琳
Owner YANGZHOU UNIV
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