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A method for preparing capacitor carbon from lignin-rich biomass as raw material

A biomass raw material, biomass carbon technology, applied in chemical instruments and methods, hybrid capacitor electrodes, hybrid/electric double layer capacitor manufacturing, etc. Effectiveness of utilization rate, reduced energy consumption, and high activation efficiency

Active Publication Date: 2021-11-02
GUANGXI ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When carbonizing biomass raw materials, a large amount of water vapor, volatile gas and tar will be produced, resulting in low yield and serious pollution
Many biomass raw materials are mixed with a lot of dust and silt, and the quality of the raw materials cannot be guaranteed. As a result, the capacitor carbon produced by domestic manufacturers has high ash content, many impurities, low conductivity, small specific surface area, and product quality cannot be guaranteed.
On the other hand, the technology for activating biomass carbonized materials is limited. Physical activation and chemical activation are both activation of carbon, which have been developed to the extreme, and it is difficult for new methods to emerge.
The physical activation method of water vapor and carbon dioxide gas has complicated equipment, high energy consumption, long time and limited effect; the chemical activation method using potassium hydroxide, phosphoric acid, zinc chloride and other activators has large pollution and serious corrosion to equipment

Method used

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  • A method for preparing capacitor carbon from lignin-rich biomass as raw material
  • A method for preparing capacitor carbon from lignin-rich biomass as raw material
  • A method for preparing capacitor carbon from lignin-rich biomass as raw material

Examples

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Embodiment 1

[0047] A method for preparing capacitor carbon using lignin-rich biomass as a raw material, using coconut palm peeled off from coconuts produced in Wenchang County, Hainan as a carbon precursor, potassium carbonate as an activator, and urea as a co-activator, specifically The operation steps are as follows:

[0048] (1) Pretreatment of coconut palm

[0049] Cut coconut palm into 2 to 3 cm segments, add 0.2% detergent to the washing water, rinse with a high-pressure water gun to remove sand, rinse three times, and dry at 130°C for 6 hours to obtain coconut palm raw material.

[0050] (2) Hydrothermal coalification pretreatment

[0051] In the polytetrafluoroethylene cylinder of the hydrothermal kettle, according to the mass ratio of 1:1.1:0.1, add 50 grams of coconut palm raw materials, 55 grams of deionized water, and 5 grams of 30% hydrogen peroxide aqueous solution, tighten the lid of the kettle, Heat up to 200°C in the Furnace, keep it for 3 hours, take it out, wash it tw...

Embodiment 2

[0076] A kind of method that is raw material to prepare electric capacity carbon with the biomass rich in lignin, present embodiment uses lower sodium carbonate Na 2 CO 3 As the activator, the coconut palm produced in Wenchang County, Hainan is used as the precursor of carbon, and urea is used as the co-activator. The specific operation steps are as follows:

[0077] (1) Pretreatment of coconut palm

[0078] Cut coconut palm into 2 to 3 cm sections, add 0.2% detergent to the washing water, rinse with a high-pressure water gun to remove sand, rinse three times, and dry at 130°C for 6 hours to obtain coconut palm raw material.

[0079] (2) Hydrothermal coalification pretreatment

[0080] According to the mass ratio of 1:1.1:0.1, add 50 grams of coconut palm raw materials, 55 grams of deionized water, and 5 grams of 30% hydrogen peroxide solution into the hydrothermal kettle, tighten the lid of the kettle, and heat up to 200 ° C in the muffle furnace , kept for 2 hours, washed...

Embodiment 3

[0099] The lignin content of moso bamboo is about 30%, which is higher than the 20% content of general biomass. Moso bamboo has a strong ability to renew and regenerate, and its output is high. my country's moso bamboo is very rich in resources. In the past, it was used in large quantities as scaffolding for building buildings. Now it is replaced by steel pipes. It is necessary to find new uses for moso bamboo. Due to the high lignin content of moso bamboo, it consumes a lot of alkali to make paper pulp, so it is generally not used for paper making, but moso bamboo is a good raw material for firing capacitor carbon. In this example, bamboo is used as the carbon precursor, potassium carbonate is used as the activator, and urea is used as the co-activator to illustrate the specific operation steps and implementation results of Example 3.

[0100] A method for preparing capacitor carbon from lignin-rich biomass, comprising the steps of:

[0101] (1) Pre-treatment of moso bamboo ...

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Abstract

The invention discloses a method for preparing capacitor carbon by using lignin-rich biomass as raw material, which comprises the following steps: (1) pretreatment: cutting off the biomass raw material, washing and drying; (2) hydrothermal coalification pretreatment Treatment: add water and hydrogen peroxide to the biomass raw material, keep in a hydrothermal kettle at 180°C to 220°C for 2 to 3 hours, and dry; (3) Ingredients and aging: mix the hydrothermal raw material charcoal powder with activator and auxiliary activation (4) carbonization-activation: the mixture is kept at 850°C-880°C for 1-1.5 hours, and then lowered to room temperature; (5) post-treatment of capacitor carbon: the carbonized material is washed-acid-washed , dried, and ground to obtain capacitor carbon. (6) Recovery of activator: recovery of activator from the filtrate washed with carbonized material for recycling. The capacitance carbon produced by the invention has large specific surface area, high yield, less ash content, low cost, hardly produces tar and organic gas, and more than 80% of the activator can be recycled and reused.

Description

technical field [0001] The invention relates to the technical field of capacitor carbon preparation, in particular to a method for preparing capacitor carbon by using lignin-rich biomass as a raw material. Background technique [0002] Lignin is the second largest component of biomass. It is a polymer resin of three phenolic monomers. The carbon content is as high as 62%. It has an aromatic ring structure with a large number of sp2 carbon atoms. It is easy to graphitize during carbonization and generates graphite. Crystal is the best raw material for making capacitor carbon. Among all kinds of biomass, coconut shell has the highest lignin content of 42%, and its texture is hard. It is recognized as the best raw material for firing activated carbon for supercapacitors. The supply exceeds demand, and the price increases year by year. At the same time, in the traditional two-step method of carbonization and activation, coconut shell charcoal is fired with coconut shells. Gener...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B32/318C01B32/33C01B32/348H01G11/24H01G11/34H01G11/44H01G11/86
CPCC01B32/318C01B32/33C01B32/348H01G11/24H01G11/34H01G11/44H01G11/86
Inventor 杜奇石龙思宇唐培朵冼学权
Owner GUANGXI ACAD OF SCI