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Lignin-based molded activated carbon and preparation method thereof

A shaped activated carbon and lignin-based technology, applied in chemical instruments and methods, non-metallic elements, inorganic chemistry, etc., can solve the problems of unable to shape and prepare granular activated carbon, low energy consumption and production cost, and inability to industrialize production, etc., to achieve change Effects of glass transition temperature and softening point, improvement of performance, reduction of degree of polymerization and molecular weight

Pending Publication Date: 2021-03-02
INST OF CHEM IND OF FOREST PROD CHINESE ACAD OF FORESTRY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

With ZnCl 2 , KOH, NaOH and other strong acids and bases are used as activators, which cause great corrosion damage to equipment and serious environmental pollution, and are not applicable in practical applications, and there is no industrial production at present; 3 PO 4 When used as an activator, the prepared activated carbon has well-developed mesopores, low energy consumption and production cost, and has a good adsorption effect on macromolecular substances in the liquid phase. It is the most promising method for preparing activated carbon from lignin-based raw materials, but the current H 3 PO 4 Preparation of powdered activated carbon for activators, and rarely with H 3 PO 4 A report on the preparation of lignin-based shaped activated carbon as an activator
This is due to the low reactivity of lignin-phosphoric acid, the difficulty of activation, the high-temperature foaming and expansion of lignin, which cannot be shaped to prepare granular activated carbon, and the existence of problems such as industrial production.

Method used

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  • Lignin-based molded activated carbon and preparation method thereof
  • Lignin-based molded activated carbon and preparation method thereof
  • Lignin-based molded activated carbon and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] A method for preparing lignin-based shaped activated carbon by baking pretreatment, the process flow is as follows figure 1 shown. The method specifically includes the following steps:

[0028] (1) Sieve the residue (lignin content 40.3%, hemicellulose content 0.5%) after extracting xylose from corncobs, and take the part with a particle size larger than 40 mesh and bake at 250 ° C for 3 hours;

[0029] (2) Weigh the roasted corncob extract xylose residue and phosphoric acid with a mass fraction of 55% and mix them according to the impregnation ratio of 1:2, and impregnate and knead at a temperature of 140°C, and the impregnation and kneading is completed in the closed silo of the kneader , after the kneading is completed, put it into an oven at 140°C, and adjust the dry and wet state of the material until it can be formed and granulated;

[0030] (3) Transfer to the forming mold for granulation. After granulation, bake at 70°C until hardened, then heat up to 140°C an...

Embodiment 2

[0034] A method for preparing lignin-based shaped activated carbon, specifically comprising the following steps:

[0035] (1) Sieve the residue after extracting xylose from corncobs (with a lignin content of 40.3%, and a hemicellulose content of 1.5%), and take the part with a particle size greater than 40 mesh and bake it at 260°C for 3 hours;

[0036] (2) Mix the xylose residue extracted from the corncob after the baking treatment with phosphoric acid with a mass fraction of 55% according to the impregnation ratio of 1:1.5, and impregnate and knead at a temperature of 140° C., and the kneading is completed in a closed silo of the kneader, After the kneading is completed, put it into an oven at 140°C, and adjust the dry and wet state of the material until it can be formed and granulated;

[0037] (3) Transfer to a molding mold for granulation, bake at 70°C until hardened after granulation, then heat up to 140°C for drying, move to an activation furnace for activation at 600°C...

Embodiment 3

[0040] A method for preparing lignin-based shaped activated carbon, specifically comprising the following steps:

[0041] (1) Sieve the lignin raw material (with a lignin content of 79.4% and a hemicellulose content of 0.1%) extracted by alkali after extracting xylose from corn cobs, and bake the part with a particle size greater than 40 mesh at 260°C for 3 hours;

[0042] (2) Weigh the baked corncobs to extract xylose and then mix the lignin extracted by alkali with phosphoric acid with a mass fraction of 55% according to the impregnation ratio of 1:3, and impregnate and knead at a temperature of 140°C, and knead in a kneader Finished in a closed silo, put it into a 140°C oven after kneading, and adjust the dry and wet state of the material until it can be shaped and granulated;

[0043] (3) Transfer to a forming mold for granulation. After granulation, bake at 70°C until hardened, then heat up to 140°C and dry. After drying, move to an activation furnace and activate at 550°...

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Abstract

The invention discloses lignin-based molded activated carbon and a preparation method thereof, and belongs to the technical field of preparation of novel activated carbon. According to the method, when the lignin-based formed activated carbon is prepared by a phosphoric acid activation method, a lignin-based raw material is baked for pretreatment, then the baked lignin-based raw material is mixedwith a phosphoric acid solution, and the lignin-based formed activated carbon is prepared by dipping, granulating, activating and rinsing, wherein the baking temperature is 240-280 DEG C, and the baking time is 1-5h. According to the method, the lignin-based raw material is pretreated through baking, a phosphoric acid permeation activation action path is opened, phosphoric acid and the raw material are in full contact, and the activated carbon performance is effectively improved; and after baking, lignin macromolecules are partially depolymerized and carbonized, part of gas is released, the glass-transition temperature and softening point of lignin are changed, the lignin expansion foaming reaction is reduced, and forming and maintaining of the wear resistance of the activated carbon are facilitated. The iodine adsorption value of the activated carbon is greater than 800mg / g, the methylene blue adsorption value is greater than 180mg / g, and the wear resistance is greater than 85%.

Description

technical field [0001] The invention belongs to the technical field of novel activated carbon preparation, and in particular relates to a lignin-based shaped activated carbon and a preparation method thereof. Background technique [0002] Lignin is one of the three major components of wood fiber. It has a wide range of sources and is the main by-product of the pulp and paper industry, as well as the main by-product of biomass hydrolysis and cellulosic ethanol production. It is an important renewable energy source. It is estimated that the industrial lignin produced by the papermaking and cellulosic ethanol industries in the world exceeds 5×10 7 t, but less than 10% is effectively utilized, and the rest of the lignin is mainly used for combustion to generate electricity. Part of the papermaking wastewater containing lignin is directly discharged, which not only causes waste of resources, but also causes environmental pollution. Lignin has a high carbon content and a molecul...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/318C01B32/342
CPCC01B32/318C01B32/342
Inventor 许伟刘军利孙康王傲孙昊卢辛成陈超徐茹婷张艳萍马名哲檀畅
Owner INST OF CHEM IND OF FOREST PROD CHINESE ACAD OF FORESTRY
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