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A method for extracting cellulose nanofibers from humulus stems

A nanofiber and cellulose technology, which is applied to the post-treatment modification of cellulose pulp, fiber raw materials, fiber raw material treatment, etc., can solve the problems of increasing the amount of pretreatment chemicals, the difficulty of waste liquid treatment, and unfavorable environmental protection. Promote the progress of subsequent reactions, reduce fiber size, and shorten the process time

Active Publication Date: 2017-09-01
YANGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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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  • A method for extracting cellulose nanofibers from humulus stems
  • A method for extracting cellulose nanofibers from humulus stems
  • A method for extracting cellulose nanofibers from humulus stems

Examples

Experimental program
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Effect test

specific Embodiment approach 1

[0043] (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.

[0044] (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

[0051] 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

[0053] 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 present invention relates to the technical field of preparation of nanomaterials, and more specifically relates to a method for extracting cellulose nanofibers from humulus stems. The invention provides a method for extracting cellulose nanofibers from humulus stems, comprising: 1. Cutting to powder, 2 acid-base treatment to remove pectin plain color, 3 bleaching treatment under high temperature and high pressure conditions, 4 lye treatment under high temperature and high pressure conditions, 5 ultrasonic treatment, 6 freeze-thaw filtration, 7 freeze-drying. For the first time, the present invention creatively uses Humulus japonicus as biomass raw material, high temperature and high pressure combined with ultrasonic crushing process to prepare cellulose nanofibers, which can not only turn waste into treasure, reduce the use of weeding pesticides, reduce environmental pollution, but also solve the problem of strong acid hydrolysis. Disadvantages of insufficient aspect ratio of cellulose nano whiskers.

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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Patent Type & Authority Patents(China)
IPC IPC(8): D21H11/18D21B1/30D21C1/04D21C1/06
CPCD21B1/303D21C1/04D21C1/06
Inventor 周骥平姜亚妮张琦朱兴龙陈冬冬衡琳
Owner YANGZHOU UNIV