A method for extracting lignin from papermaking black liquor by magnetic emulsion liquid membrane separation

A technology of lignin and emulsion, which is applied in the field of papermaking, can solve the problems affecting the repeated use of oil phase and the quality of oil phase, and achieve the effects of avoiding excessive use and resource consumption, high recycling rate, avoiding use and resource consumption

Active Publication Date: 2020-04-28
QILU UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The commonly used demulsification method will affect the quality of the oil phase, thereby affecting the repeated use of the oil phase

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0064] FeCl 3 .6H 2 O and FeSO 4 .7H 2 O was dispersed in 100mL deionized water according to the molar ratio of 2:1 and transferred to a 250ml three-necked flask and stirred to become brick red (it took half an hour); then heated in a water bath to 50°C, and the pH value was adjusted to 11.0-12.0 with NaOH; Temperature to 65°C, stir until it turns black (2 hours); add 2 times the mass of oleic acid, continue to stir and raise the temperature to 65°C, adjust the pH to 6.0-7.0, react for 2 hours and remove the black precipitate with deionized water and acetone Repeated magnetic decantation cleaning to remove excess oleic acid; dried the obtained particles in a vacuum oven at 60°C overnight to obtain oleic acid-modified nano-Fe 3 o 4 Particles (i.e. nano-Fe 3 o 4 modified particles).

[0065] 0.5 phr nano-Fe 3 o 4 The modified particles and 3 parts of carrier TBP were dispersed in 100 parts of rapeseed oil, and ultrasonically dispersed for 15 minutes to make them uniform...

Embodiment 2

[0070] FeCl 3 .6H 2 O and FeSO 4 .7H 2 O was dispersed in 100mL of deionized water at a molar ratio of 2:1 and transferred to a 250ml three-necked flask and stirred until it turned brick red (it took half an hour); heated to 50°C in a water bath, 3 .H 2 O to adjust the pH to 11.0-12.0. Raise the temperature to 65°C and stir until it turns black (2 hours); add 5 times oleic acid, continue to stir and raise the temperature to 65°C, adjust the pH value to 6.0-7.0, react for 2 hours and remove the black precipitate with deionized water and acetone Repeated magnetic decantation cleaning to remove excess oleic acid; dried the obtained particles in a vacuum oven at 60°C overnight to obtain oleic acid-modified nano-Fe 3 o 4 Particles (i.e., nano-Fe 3 o 4 modified particles).

[0071] 1.0 parts of nano-Fe 3 o 4 The modified particles and 3 parts of carrier Cyanex 923 were dispersed in 100 parts of the oil phase, and ultrasonically dispersed for 30 minutes to make the dispers...

Embodiment 3

[0076] FeCl 3 .6H 2 O and FeSO 4 .7H 2 O was dispersed in 100mL deionized water at a molar ratio of 2:1 and transferred to a 250ml three-necked flask and stirred until it turned brick red (it took half an hour); then heated to 50°C in a water bath, and 3 .H 2 O to adjust the pH value to 11.0-12.0; raise the temperature to 65°C, stir until it turns black (2 hours); then add 3 times oleic acid, continue to stir and raise the temperature to 65°C, adjust the pH value to 6.0-7.0, and react After 2 hours, the black precipitate was repeatedly washed by magnetic decantation with deionized water and acetone to remove excess oleic acid, and the obtained particles were dried overnight in a vacuum oven at 60°C to obtain oleic acid-modified nano-Fe 3 o 4 Particles (i.e., nano-Fe 3 o 4 modified particles).

[0077] 2.0 parts nano-Fe 3 o 4 The modified particles and 3 parts of carrier Cyanex 923 were dispersed in 100 parts of oil phase, ultrasonically dispersed for 30 minutes to di...

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PUM

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Abstract

The invention provides a method for extracting lignin in papermaking black liquor by magnetic emulsion liquid-membrane separation. The method comprises the following steps: taking oleic acid cladded ferriferrous oxide (Fe3O4) nano solid particles as a stabilizer and mixing an organic solvent and a carrier to form an oil membrane; dispersing the particle stabilizer into the oil membrane to form anoil phase; then shearing and emulsifying the oil phase and a water phase to obtain needed stable water-in-oil type emulsion; adding the stable water-in-oil type emulsion into supernatant of the blackliquor and stirring to form water-in-oil-in-water composite emulsion; under the action of a pushing force of concentration difference, enriching the lignin into the water phase through the carrier; after finishing extraction, demulsifying to recycle an emulsifier and the oil membrane for recycling. The method provided by the invention is simple in steps, convenient to operate and strong in practicability.

Description

technical field [0001] The invention belongs to the technical field of papermaking, and in particular relates to the preparation of a magnetic emulsion film and a method for separating and extracting lignin from black liquor. Background technique [0002] Lignin is a kind of natural polyhydroxy aromatic compound, a kind of polyphenolic compound, which acts as a binding substance of cellulose and hemicellulose in plants, and is a renewable resource. As a degradable natural polymer material with superior performance, lignin can be used to produce phenolic platform compounds such as benzene, phenol substitutes, aromatic acids or polymer materials such as fillers, binders, rubber, antioxidants and antibacterial agents etc., can be used as raw materials to prepare engineering plastics, such as carbon fiber and graphene, with extremely high added value. Generally, the lignin content in lignocellulosic raw materials for papermaking is 20%-30%. During the pulping and cooking proces...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08H7/00
CPCC08H6/00
Inventor 林兆云杨桂花陈嘉川
Owner QILU UNIV OF TECH
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