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

A method for reusing ionic liquid from waste liquid for preparing cellulose nanofibers

A technology of nanofibers and ionic liquids, applied in the field of chemical waste liquid treatment, can solve problems such as unsatisfactory, and achieve the effect of simple operation, mild conditions, and efficient recycling and reuse

Inactive Publication Date: 2020-12-15
NANJING FORESTRY UNIV
View PDF4 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

From the current recycling methods of ionic liquids, there is no method that can meet this requirement.

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

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • A method for reusing ionic liquid from waste liquid for preparing cellulose nanofibers
  • A method for reusing ionic liquid from waste liquid for preparing cellulose nanofibers
  • A method for reusing ionic liquid from waste liquid for preparing cellulose nanofibers

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] A method for reclaiming a quaternary ammonium salt ionic liquid from waste liquid preparing cellulose nanofibers, the steps are as follows:

[0030] 1) Take 3 g of waste liquid from the preparation of cellulose nanofibers (containing a quaternary ammonium salt ionic liquid with a mass percentage concentration of 5%), add dichloromethane and water in sequence, mix well, let stand for 10 minutes, and extract once. Most of the DMSO goes into the aqueous phase. Wherein, the mass of waste liquid accounts for 15% of the total mass of the system, and the mass concentration ratio of dichloromethane / water is 10:1.

[0031] 2) Collect the dichloromethane extraction phase in the lower layer, and rotate it at room temperature for 20 minutes. Observe that there is no more liquid distilled out, collect the residue, and use a vacuum freeze dryer with a temperature of -50 ° C and a vacuum of 20 Pa to dry it in a vacuum. Sample 12h.

[0032] 3) Add 5 times the mass of dichloromethane ...

Embodiment 2

[0036] A method for reclaiming a quaternary ammonium salt ionic liquid from waste liquid preparing cellulose nanofibers, the steps are as follows:

[0037] 1) Take 3 g of waste liquid from the preparation of cellulose nanofibers (containing a quaternary ammonium salt ionic liquid with a mass percentage concentration of 5%), add dichloromethane and water in sequence, mix well, let stand for 10 minutes, and extract once. Most of the DMSO goes into the aqueous phase. Wherein, the mass of waste liquid accounts for 15% of the total mass of the system, and the mass concentration ratio of dichloromethane / water is 5:1.

[0038] 2) Collect the dichloromethane extraction phase in the lower layer, and rotate it at room temperature for 20 minutes. Observe that there is no more liquid distilled out, collect the residue, and use a vacuum freeze dryer with a temperature of -50 ° C and a vacuum of 20 Pa to dry it in a vacuum. Sample 12h.

[0039] 3) Add 5 times the mass of dichloromethane t...

Embodiment 3

[0043] A method for reclaiming a quaternary ammonium salt ionic liquid from waste liquid preparing cellulose nanofibers, the steps are as follows:

[0044] 1) Take 3 g of waste liquid from the preparation of cellulose nanofibers (containing a quaternary ammonium salt ionic liquid with a mass percentage concentration of 5%), add dichloromethane and water in sequence, mix well, let stand for 10 minutes, and extract once. Most of the DMSO goes into the aqueous phase. Wherein, the mass of waste liquid accounts for 15% of the total mass of the system, and the mass concentration ratio of dichloromethane / water is 1:1.

[0045]2) Collect the dichloromethane extraction phase in the lower layer, and rotate it at room temperature for 20 minutes. Observe that there is no more liquid distilled out, collect the residue, and use a vacuum freeze dryer with a temperature of -50 ° C and a vacuum of 20 Pa to dry it in a vacuum. Sample 12h.

[0046] 3) Add 5 times the mass of dichloromethane to...

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 method for recycling an ionic liquid from a waste liquid used for preparing a cellulose nanofiber. The method comprises the following steps: extracting and separating the waste liquid used for preparing the cellulose nanofiber with double solvents; implementing reduced pressure distillation on an extracting phase at the room temperature, collecting a spiral raffinate, anddrying in vacuum; and adding a solvent into the dried product, precipitating anhydride, centrifuging and separating, and implementing reduced pressure distillation on a liquid supernatant, thereby obtaining the recycled ionic liquid. The method for the recycling the ionic liquid is simple and convenient to operate, the condition is mild, no secondary pollution is caused, the method has the application potential in the industrial production, the recovery rate of the ionic liquid is relatively high, the ionic liquid is reused, meanwhile, a related added extracting agent and the solvent in the recycling process can be efficiently recycled and reused, and the green production is realized.

Description

technical field [0001] The invention belongs to the field of chemical waste liquid treatment, in particular to a method for recovering quaternary ammonium salt ionic liquid from waste liquid for preparing cellulose nanofibers. Background technique [0002] Cellulose is a natural organic substance with abundant reserves in nature. It has the advantages of being renewable, degradable, and bio-friendly. It is widely used in the fields of pulp and paper, textiles, pharmaceuticals, and polymer materials. However, as a renewable biomass resource, cellulose has a large number of intramolecular and intermolecular hydrogen bonds and high crystallinity, which makes it insoluble in most conventional solvents and difficult to be directly utilized, so its application is hindered. . The development and application of cellulose has always been a hot spot worldwide, and the study of solvents that can dissolve cellulose is of great significance. As a green solvent, ionic liquid has the adv...

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
Patent Type & Authority Patents(China)
IPC IPC(8): C08J3/09C08L1/02
CPCC08J3/091C08J2301/02
Inventor 潘晖陈伟牛逊
Owner NANJING FORESTRY UNIV
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