Unlock instant, AI-driven research and patent intelligence for your innovation.

Method of preparing carbon fiber from lignin extracted by aqueous solution

A technology of lignin and aqueous solution, which is applied to the chemical characteristics of fibers, textiles and papermaking, etc., can solve the problems of long stabilization time, long demand time and high production cost, and achieve the goal of reducing production cost, improving production efficiency and reducing processing cost Effect

Inactive Publication Date: 2018-10-02
熊彬懿 +1
View PDF3 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] On the one hand, although lignin has a large output and low price, if it is used to prepare carbon fiber, it needs to be purified first, and the structure of lignin is complex, and the performance of different lignins is very different. For the purification of lignin, the existing research Most of the lignin is extracted with organic solvents (because inorganic salts are insoluble in organic solvents), and its purification effect is good, but the cost may be relatively high, including solvent costs (solvents can be mostly recovered), solvent removal costs (heating evaporation), and possible environmental costs
In addition, since organic solvents cannot dissolve large molecular weight lignin polymer components, the yield of its purification is generally lower than 80%, resulting in a further increase in raw material costs
[0005] On the other hand, the heat stabilization of lignin carbon fiber, that is, the heating and oxidation takes a long time, generally as many as ten to dozens of hours, and the existing technology solves this kind of problem through different wood Sources of lignin (such as the relatively short stabilization time of softwood lignin carbon fiber), extraction of different lignin components (different organic solvent extraction), and raw material lignin formulations (such as mixing different lignin, etc.) to find a relatively short time Carbon fiber stabilization process, but none of these methods can fundamentally solve the problem (the total stabilization time is still very long), and its cost is high, the operation is complicated, and it does not have the possibility of actual production operation
[0006] Based on the above reasons, the existing technologies have not completely solved the problems of low processing efficiency and high production cost of lignin carbon fiber caused by the above two problems, and thus have little impact on its industrial 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

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Method of preparing carbon fiber from lignin extracted by aqueous solution
  • Method of preparing carbon fiber from lignin extracted by aqueous solution

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] see figure 1 A process frame diagram of a method for preparing carbon fibers from lignin extracted from an aqueous solution is used to process carbon fibers. In this embodiment, a single reed is used as a raw material, and the lignin in the reed is extracted using a lignin extraction process. Extraction, adding the extracted lignin into a weakly acidic aqueous solution with a pH value of 6, controlling the weight ratio of the aqueous solution to the lignin in the weakly acidic aqueous solution to be 16:1, and carrying out the acidolysis reaction of the mixture solution at room temperature. Stir evenly during the process, then stir evenly, wash the reactants with clean water after stirring evenly, and complete a purification cycle with this, perform 3 purification cycles on the same lignin material, and then dry the purified lignin first , and then vacuum-dried to a moisture content of <2%, and set aside.

[0032] The lignin purified and dried in the above steps is mixe...

Embodiment 2

[0035] see figure 2 A process frame diagram of a method for preparing carbon fibers from lignin extracted from an aqueous solution is used to process carbon fibers. In this embodiment, a 1:1:1 mixture of rice straw, reeds, and corn stalks is used as a raw material, and is used The lignin extraction process extracts the lignin in the reed. When extracting, the extracted lignin is first added to a weakly acidic aqueous solution with a pH value of 4, and the weight ratio of the aqueous solution to the lignin in the weakly acidic aqueous solution is controlled to be 10:1. The mixture solution is subjected to acidolysis reaction at room temperature, stirred evenly during the acidolysis reaction process, then stirred evenly, after the reactants are stirred evenly, washed with water, and a purification cycle is completed, and the same lignin material is subjected to 5 Purification cycle, and then the purified lignin is first dried, and then vacuum-dried to a moisture content of <2%,...

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

PropertyMeasurementUnit
boiling pointaaaaaaaaaa
Login to View More

Abstract

The invention discloses a method of preparing a carbon fiber from lignin extracted through an aqueous solution. The method comprises the steps of extracting the lignin through the weakly acidic aqueous solution according to the characteristic that absolutely most inorganic salts are dissolved in the acidic aqueous solution, modifying the lignin extracted through the weakly acidic aqueous solutionby using an agent, performing melting and drawing, performing preoxidation treatment on a drawn protofilament by direct preheating or direct ultraviolet irradiation and preheating, and carbonizing anintermediate product after the preoxidation treatment to form the finished product of the carbon fiber. The method can greatly shorten the time required by stabilization, so that the production efficiency is improved greatly, and the production cost is lowered.

Description

technical field [0001] The invention relates to the field of carbon fiber materials in new material technology, in particular to a method for preparing carbon fibers from lignin extracted from an aqueous solution. Background technique [0002] Lignin is a renewable biological raw material, which widely exists in plants in nature, accounting for 25-35% of the total weight of plants. In modern industry, lignin is mainly used as a by-product of the paper industry. It has a wide range of raw materials and a large output, with an annual output of more than 50 million tons, but its actual utilization rate is extremely low. Part of it is used as fuel for incineration, and the combustion efficiency of this lignin fuel is low, and its combustion process will release a large amount of carbon dioxide, carbon monoxide and other combustion pollutants, which will cause greater pressure on the environment. [0003] On the other hand, lignin is also considered to be an ideal raw material f...

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 Applications(China)
IPC IPC(8): D01F9/17C08H7/00
CPCC08H6/00D01F9/17
Inventor 熊彬懿代徐良
Owner 熊彬懿