Preparation method of activated carbon

An activated carbon and a technology for preparing activated carbon, applied in the field of biochemical industry, can solve problems such as waste and environmental pollution, and achieve the effect of improving utilization rate, large economic and social benefits

Active Publication Date: 2011-07-27
ANHUI BBCA FERMENTATION TECH ENG RES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For example, using corncobs to prepare furfural will produce a large amount of residues. If these...

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Add 1.8% sodium hydroxide solution to the corn stalks at a solid-to-liquid ratio of 1:5 (weight to volume ratio), and cook at 105° C. for 1.5 hours. Centrifuge after the reaction is over, wash the filter residue with hot water, place it in a container, add water to adjust the dry matter concentration to 18%, adjust the pH value to 4.8, and add cellulase (20 FPIU / gram cellulose) and xylan Enzyme (15FPIU / gram cellulose), stirring speed 200rpm, centrifugation after 36 hours of enzymolysis, the filtrate is set aside, and the filter residue is used to prepare activated carbon.

[0019] Using ZnCl 2 Activated carbon was prepared as an activator, and the optimal activation conditions were obtained through orthogonal experiment optimization: activation temperature 800°C, ZnCl 2 The solution concentration is 125g / L, the activation time is 45min, and the preferred dosage of activator is 1.2L / kg enzymolysis residue. Under these conditions, the iodine adsorption value of the acti...

Embodiment 2

[0021] Add 2.0% sodium hydroxide solution to the wheat straw at a solid-to-liquid ratio of 1:6 (weight to volume ratio), and cook at 115° C. for 1.0 hour. Centrifuge after the reaction is over, wash the filter residue with hot water, put it in a container, add water to adjust the dry matter concentration to 15%, adjust the pH to 4.8, and add cellulase (30 FPIU / gram cellulose) and xylanase (10FPIU / gram cellulose), stirring speed 200rpm, centrifugation after 48 hours of enzymolysis, the filtrate is set aside, and the filter residue is used to prepare activated carbon.

[0022] Use H 3 PO 4 Activated carbon was prepared as an activator, and the optimal activation conditions were obtained through orthogonal test optimization: phosphoric acid concentration 40%, activation temperature 450°C, activation time 30min, and the preferred dosage of activator was 0.8L / kg enzymolysis residue. Under these conditions, the iodine adsorption value of the activated carbon product was 1230mg / g, ...

Embodiment 3

[0024] Sorghum stalks were added with 1.5% sodium hydroxide solution at a solid-to-liquid ratio of 1:10 (weight to volume ratio), and cooked at 110° C. for 2.0 hours. Centrifuge after the reaction is over, wash the filter residue with hot water, put it in a container, add water to adjust the dry matter concentration to 12%, adjust the pH to 4.8, and add cellulase (20 FPIU / gram cellulose) and xylanase (20FPIU / gram cellulose), stirring speed 200rpm, centrifugation after 48 hours of enzymolysis, the filtrate is set aside, and the filter residue is used to prepare activated carbon.

[0025] Activated carbon was prepared by using KOH as an activator, and the optimal activation conditions were obtained through orthogonal test optimization: the activation time was 20min, the heating temperature was 850°C, the concentration of KOH solution was 25%, and the immersion time was 48h. The preferred dosage of activator was 0.75L / kg enzymolysis residue. Under these conditions, the iodine ad...

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Abstract

The invention provides a method for preparing activated carbon by degraded residues of straw-type lignocellulose, which comprises the following steps: 1) processing straw-type lignocellulose by an alkali method; 2) processing the residues obtained in step 1) by enzyme hydrolysis; and 3) performing activation to the enzyme hydrolyzed residues obtained in step 2) by a chemical activator under a high temperature condition to prepare an activated carbon product. In the method provided by the invention, the sugar solution obtained after the pretreatment of the lignocellulose raw material by the alkali method and the enzyme hydrolysis is applicable to the preparations of bio-fermentation products such as alcohol, citric acid, xylitol, and the like; the enzyme hydrolyzed residues is applicable to the preparation of activated carbon; the utilization ratio of the raw material is increased, and the method has considerable economic and social benefits.

Description

technical field [0001] The invention belongs to the technical field of biochemical industry, and in particular relates to a method for preparing activated carbon by using straw-like lignocellulose degradation residues. Background technique [0002] Lignocellulose resources widely exist in nature, and as a renewable resource, it can be used in chemical or energy fields. However, so far, the utilization rate of lignocellulosic resources is still quite low, and only a small part is used as raw material for papermaking, feed and preparation of chemicals. The traditional way of utilizing lignocellulose resources is relatively simple. In addition to returning to the field, the main ways of utilization are combustion, gasification and hydrolysis. [0003] Activated carbon products can be prepared from lignocellulosic resources. For example, using corncobs to prepare furfural will produce a large amount of residues. If these residues are not properly treated, it will not only poll...

Claims

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Application Information

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IPC IPC(8): C01B31/08C01B31/12
Inventor 吴真黄之文
Owner ANHUI BBCA FERMENTATION TECH ENG RES
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