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A microwave-assisted method for large-scale preparation of carbon nanospheres from lignin

A technology for large-scale preparation and nano-carbon spheres, applied in nanotechnology, carbon preparation/purification, etc., can solve the problems of long and complex steps, poor controllability of morphology, difficulty in large-scale preparation, etc., and reduce preparation steps and costs. The effect of low cost and shortened reaction time

Active Publication Date: 2021-05-04
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The purpose of the present invention is to provide a method for large-scale preparation of nano-carbon spheres assisted by lignin microwaves, so as to solve the problems of lengthy and complicated steps for preparing nano-carbon spheres from lignin, poor shape controllability, and difficulty in large-scale preparation. The present invention has Conducive to turning waste lignin resources into treasure and realizing high-value utilization

Method used

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  • A microwave-assisted method for large-scale preparation of carbon nanospheres from lignin
  • A microwave-assisted method for large-scale preparation of carbon nanospheres from lignin
  • A microwave-assisted method for large-scale preparation of carbon nanospheres from lignin

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Experimental program
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Effect test

Embodiment 1

[0037] Mix 5 kg of alcoholyzed lignin with a particle size of 60 to 80 mesh and 2.5 kg of silicon carbide with a particle size of 20 to 60 mesh evenly, place it in a microwave tube reactor, and feed nitrogen at a flow rate of 2.5 L / min for 15 minutes, then Nitrogen is passed through the Montessori gas scrubber bottle equipped with dichloromethane to make the nitrogen carry dichloromethane, and the carrying amount is 2.5g / min. After passing the nitrogen carrying dichloromethane into the microwave tube reactor for 10 minutes, turn on the microwave In a tubular reactor, the microwave frequency is 2.45GHz, the microwave power is 300W, the temperature is raised to 400°C, and the temperature is kept for 10 minutes; then the microwave power is adjusted to 1200W, the temperature is raised to 800°C, and the temperature is kept for 60 minutes. Close the microwave tube reactor, remove the Montessori scrubber bottle containing dichloromethane, keep feeding nitrogen, and stop feeding nitrog...

Embodiment 2

[0039]Mix 20kg of kraft lignin with a particle size of 80-100 mesh and 60kg of silicon carbide with a particle size of 80-100 mesh evenly, place it in a microwave tube reactor, and feed nitrogen at a flow rate of 40L / min for 15 minutes, and then nitrogen Make the nitrogen carry the dichloromethane through the Montessori gas scrubber bottle equipped with dichloromethane, and the carrying amount is 200g / min. After passing the nitrogen gas carrying the dichloromethane into the microwave tube reactor for 10 minutes, start the microwave tube reaction The microwave frequency is 2.45GHz, the microwave power is 500W, the temperature is raised to 500°C, and the temperature is kept for 5 minutes; then the microwave power is adjusted to 1500W, the temperature is raised to 1200°C, and the temperature is kept for 30 minutes. Close the microwave tube reactor, remove the Montessori scrubber bottle containing dichloromethane, keep feeding nitrogen, and stop feeding nitrogen when the temperatur...

Embodiment 3

[0041] Mix 10kg of lignosulfonate with a particle size of 80-120 mesh and 20kg of silicon carbide with a particle size of 40-80 mesh evenly, place it in a microwave tube reactor, and feed nitrogen at a flow rate of 10L / min for 15 minutes, and then put Nitrogen passes through the Montessori gas scrubber bottle equipped with dichloromethane to make the nitrogen carry dichloromethane, and the carrying amount is 30g / min. After passing the nitrogen carrying dichloromethane into the microwave tube reactor for 10 minutes, turn on the microwave tube reactor. In the reactor, the microwave frequency is 2.45GHz, the microwave power is 400W, the temperature is raised to 450°C, and the temperature is kept for 8 minutes; then the microwave power is adjusted to 1300W, the temperature is raised to 1000°C, and the temperature is kept for 40 minutes. Close the microwave tube reactor, remove the Montessori scrubber bottle containing dichloromethane, keep feeding nitrogen, and stop feeding nitroge...

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Abstract

The invention discloses a method for large-scale preparation of nano-carbon spheres assisted by lignin microwaves. First, the lignin and silicon carbide are evenly mixed and placed in a microwave tube reactor; nitrogen gas is introduced into the inlet of the microwave tube reactor to discharge the reaction The air in the system, the outlet gas of the microwave tube reactor is connected with a cold hydrazine system, then the nitrogen is passed through dichloromethane to make the nitrogen carry the dichloromethane, and the nitrogen carrying the dichloromethane is passed into the microwave tube reactor; When the nitrogen gas carrying dichloromethane is introduced, the microwave tube reactor is turned on for the reaction. After the reaction, the mixture of lignin carbon and silicon carbide is taken out from the microwave tube reactor, put into water or ethanol and stirred evenly After standing still, the lignin carbon floating on the liquid is taken out and then dried, and the solid product obtained is nano-carbon spheres. The invention is beneficial to turning waste lignin resources into wealth and realizing high-value utilization.

Description

technical field [0001] The invention belongs to the field of preparing functional materials from waste resources, and in particular relates to a method for large-scale preparation of nano carbon spheres assisted by lignin microwaves. Background technique [0002] Lignin is a by-product of pulping and papermaking and biomass refining process (bio-ethanol), which is produced in a huge amount. At present, the main way of utilization is direct combustion as a low-value fuel. However, the utilization of this low added value not only brings environmental pollution problems, but also directly affects the technical economy of pulping, papermaking and biomass refining processes. Therefore, using the characteristics of high carbon content in lignin as a carbon source to prepare fuels and high-quality carbon materials has become an important research direction. At present, lignin has received a lot of attention in the direction of preparing nano-carbon spheres. Nano-carbon spheres can...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B32/05B82Y40/00
CPCC01P2004/32C01P2004/62C01P2004/64C01P2006/12C01B32/05
Inventor 王文亮黄佳乐李新平马振浩赵兴金
Owner SHAANXI UNIV OF SCI & TECH
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