Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Method for preparing lignose chitosan reaction film

A technology of lignin and chitosan, used in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc.

Inactive Publication Date: 2008-12-17
NORTHEAST FORESTRY UNIVERSITY +2
View PDF0 Cites 10 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Studies on film-forming materials have shown that, considering only the molecular shape, generally long-chain molecules with long branched chains or regular structures have good film-forming properties, while lignin has a three-dimensional network structure, which is complex and irregular. Meet the conditions for film production

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] Dissolve the raw material with 1mol / L NaOH solution, filter to remove the insoluble matter in the raw material, adjust the pH value of the solution to 3.5 with 1mol / L HCI, filter, fully wash with distilled water until neutral, and vacuum dry at 40°C to obtain purification Alkali lignin.

[0015] Dissolve alkali lignin in dioxane: water=4:1 (v / v) solution to configure 3% (w) alkali lignin solution; chitosan is dissolved in 2% (w) acetic acid solution and stand to remove Bubble is made into the chitosan solution of 3% (w). The two were mixed uniformly according to the volume ratio of 1:2, and then 0.3% (w) glyoxal crosslinking agent was added thereto, and the crosslinking reaction was carried out at 65° C. for 4 hours to obtain a membrane-forming solution. Take 10mL of the film-making solution and spread the film on the support body of 10cm*10cm, and volatilize the solvent in the natural state for 24h to obtain the lignin-chitosan reaction film.

Embodiment 2

[0017] Dissolve the raw material with 1000mL 0.2mol / L NaOH solution, and filter to obtain lignin lye. Take 150mL lignin lye, adjust pH=11 with 20% NaOH, add 1.6mL formaldehyde solution, heat up to 80°C and react for 120min, adjust pH=3.5 with 10% HCI solution, then keep warm at 60°C for 60min, heat filter, wash with water To neutrality, dry in a vacuum oven at 40°C for 24 hours to obtain hydroxymethylated modified lignin.

[0018] The hydroxymethylated lignin was dissolved in dioxane: water=4:1 (v / v) solution to prepare 3% (w) hydroxymethylated lignin solution; chitosan was dissolved in 2% (w) static defoaming in acetic acid solution is made into 3% (w) chitosan solution; after the two are mixed evenly according to the volume ratio of 1:2, 0.1% (w) glutaraldehyde crosslinking is added thereto Reagent, cross-linking reaction at 65°C for 4 hours to obtain membrane-forming solution. Take 10mL of the film-making solution and spread the film on a 10cm*10cm support, and dry it at ...

Embodiment 3

[0020] The purified lignosulfonate was dissolved in dioxane: water=4:1 (v / v) solution to prepare 3% (w) lignosulfate solution; chitosan was dissolved in 2% (w ) standing defoaming in the acetic acid solution to be made into 3% (w) chitosan solution; after the two are mixed evenly according to the volume ratio of 1: 2, add 0.2% (w) of ethylene glycol double shrinkage epoxy Propyl ether cross-linking agent, cross-linking reaction at 65°C for 4 hours to obtain membrane-forming solution. Take 10mL of the film-making solution and spread the film on a 10cm*10cm support, and dry it at 50°C for 1.5h to obtain a lignin-chitosan reaction film.

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention discloses a preparation method for a lignin chitosan reaction membrane. A membrane manufacturing liquid is obtained by mixing a modified lignin liquid and a chitosan liquid to react under the action of a cross-linking agent and is manufactured into the membrane by means of volatile solvent. The reaction membrane has good performances and is applicable to the separations between water and an organic system, including the separations for the systems of organic acid-water, dye-water, alcohol-water, protein-water, and the like, as well as the separations of gases. The preparation technique of the method is simple; the price of the raw materials is low; the whole preparation process is friendly to the environment; and the product of the method can be naturally decomposed with no pollution.

Description

technical field [0001] The invention relates to a preparation method of a lignin-chitosan reaction membrane, which is suitable for the separation of water and organic matter systems, including the separation of organic acid-water, dye-water, alcohol-water, protein-water and other systems and Gas separation, etc. Background technique [0002] Existing chelating membrane materials mainly include chitosan, polymer, and cellulose. Chitosan is a linear polymer polysaccharide derived from chitin N-decaproyl. There are a lot of hydroxyl groups and amino groups in chitosan, which can form a film by hydrogen bonding. It has good film-forming properties and is biodegradable. It is a green high-tech material, but the chitosan film has poor acid resistance and is relatively expensive. more expensive. Although polymer membranes have good separation performance, they have disadvantages in terms of toxicity and natural degradation. In the reproduction process of cellulose film, there a...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
IPC IPC(8): B01D71/08
Inventor 方桂珍李珊珊任世学
Owner NORTHEAST FORESTRY UNIVERSITY
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com