Paper pulp-capacitance carbon joint production method

A joint production and capacitive carbon technology, applied in chemical instruments and methods, carbon compounds, pulping with inorganic alkali, etc., can solve the problems of pollution, high cost, waste, etc., and achieve long process, high cost and improved quality Effect

Pending Publication Date: 2021-08-13
GUANGXI ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Lignin was originally a waste of the alkaline papermaking and pulping industry. The annual output of lignin in my country is more than 10 million tons. In the past, lignin was discharged as black liquor in the papermaking industry, causing serious pollution; The liquid is concentrated and burned, resulting in huge waste
The extraction of lignin from papermaking black liquor has been studied for many years. There are many patented technologies and research papers for reference. It takes multiple processes to obtain pure lignin products, which is not only costly, but may also cause additional pollution.
These difficulties are the main obstacles to the use of paper-based lignin for capacitor carbon production

Method used

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  • Paper pulp-capacitance carbon joint production method
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  • Paper pulp-capacitance carbon joint production method

Examples

Experimental program
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Effect test

Embodiment 1

[0071] The present embodiment directly uses the alkali lignin of Fujian Qingshan Paper Industry, and uses the method of the present invention to burn capacitor charcoal. 2 S) Pulping, using alkali amount a=16%, degree of sulfidation s=20%, solid-to-liquid ratio 1:5, spray-drying the black liquor after concentration to obtain alkali lignin. According to the test, 100 grams of sawdust raw materials can obtain 55 grams of alkali lignin, in which the total alkali (NaOH+Na 2 S) 18.75 grams, lignin and other organic matter 36.25 grams. The present embodiment uses potassium carbonate (K 2 CO 3) is the activator, and urea is the co-activator, illustrating the specific operation steps and results of the paper-carbon cogeneration technology line. Due to the direct use of alkali lignin from paper mills (such as figure 2 Shown) burning capacitor charcoal, has saved step (1) papermaking raw material is boiled in lye and press-filtered to separate cooking liquid, directly enters step (...

Embodiment 2

[0092] Present embodiment takes the Chinese fir chip that Sanming Qingshan Paper Industry Paper Mill provides as raw material, the 76.8 gram mixed total alkali (K) that embodiment 1 reclaims 2 CO 3 , NaOH, Na 2 1 / 5 (15.36 grams) of S) is used for pulping, and NaOH and NaOH are supplemented at a loss rate of 20%. 2 S; the remaining 4 / 5 (61.44 grams) mixed total alkali is used as an activator for burning capacitor carbon, and K is supplemented by a loss rate of 20% 2 CO 3 . The 6 operation steps and results of Example 2 are described below.

[0093] (1) Papermaking raw materials are cooked in lye, separated by pressure filtration and pulp is cleaned

[0094] Sieve off the powder and debris in the sawdust, dry, weigh 100 grams of sawdust and put it in a 2000ml conical flask, add 3.5 grams of NaOH and 1 gram of NaOH to 15.36 grams of recovered mixed alkali 2 S, add deionized water to prepare 500ml solution, pour it into a Erlenmeyer flask, tie the mouth with gauze, and cook ...

Embodiment 3

[0117] A method for joint production of pulp-capacitor carbon, comprising the steps of:

[0118] (1) The bagasse papermaking raw material is pulped by kraft pulping, and separated by pressure filtration to obtain coarse paper pulp and black liquor;

[0119] (2) Coarse pulp is used to prepare pulp products. Put the alkali lignin black liquor on a tray coated with Teflon, dry it in an oven at 120°C until it is dry, and scrape the alkali lignin from the tray Dry glue, put it in a mortar, continue to dry to constant weight, and grind it into dry alkali lignin powder;

[0120] (3) According to the mass ratio of alkali lignin dry powder: alkali activator: co-activator=1:1:0.25, add alkali activator sodium carbonate and co-activator urea in alkali lignin dry powder, finely grind and mix, in relative Aging for 8 hours in a dry environment with a humidity less than 30% to obtain a mixture.

[0121] (4) Put the aged mixture in a silicon carbide crucible, raise the temperature to 880° ...

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Abstract

The invention discloses a paper pulp-capacitance carbon joint production method, and belongs to the technical field of paper pulp and carbon materials. The method comprises the following steps: (1) pulping papermaking raw materials by using an alkaline method, carrying out filter pressing separation, and cleaning paper pulp; (2) concentrating, drying and grinding a black liquor to obtain alkali lignin dry powder; (3) mixing the alkali lignin dry powder with an alkali activator and a co-activator, grinding, and aging; (4) performing high-temperature carbonization-activation on the mixture; (5) performing post-treatment on the carbonized material to obtain capacitor carbon; and (6) recovering alkali from the water washing liquid of the carbonized material, and circularly using the alkali liquid for pulping and the alkali activator of the capacitor carbon. The byproduct alkali lignin generated by alkaline pulping is directly used as the raw material for manufacturing the capacitor carbon, the alkali is recovered and circularly used as the alkali liquor for pulping and the activator of the capacitor carbon, pollution and waste are not generated, 80% or more of the alkali activator can be recycled, good environment-friendly and ecological benefits are achieved, and very high social and economic benefits can be generated.

Description

technical field [0001] The invention relates to the technical field of pulp and carbon materials, in particular to a method for joint production of pulp and capacitor carbon. Background technique [0002] Due to the excellent performance of supercapacitors in the rapid storage of electric energy and high-power release, it is widely used in wind power and photoelectric storage, smart grid peak regulation, high-speed rail locomotives and automobile energy conservation, elevator kinetic energy-potential energy conversion, high-power robots, electromagnetic and laser weapons, There are more and more applications in locomotive cold start and other aspects, and the market demand and industrial scale are growing rapidly. Capacitor carbon is the medium for supercapacitors to store charges. It has an important impact on the specific capacitance, power and energy density, charge and discharge times, and service life of supercapacitors. It accounts for 35% of the cost of supercapacitor...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/348C01B32/324D21C3/02
CPCC01B32/348C01B32/324D21C3/02
Inventor 杜奇石唐培朵龙思宇冼学权
Owner GUANGXI ACAD OF SCI
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