A pretreatment method for preparing high specific surface hierarchical porous activated carbon from cotton straw

A high specific surface, porous activated carbon technology, applied in chemical instruments and methods, carbon compounds, inorganic chemistry, etc., can solve the problem of not fully utilizing the microscopic characteristics of biomass materials, and achieve strong sustainability, reduced dosage, and reduced cost. production cost effect

Active Publication Date: 2019-05-10
新疆弘瑞达纤维有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] Biomass activated carbon materials are mainly biological straw, such as cotton straw, wheat straw, corn straw, etc., which generally need to be pretreated when preparing activated carbon as a precursor material. The current pretreatment method is usually to crush the biological straw to powder. Its unique natural micro-pore structure has not been fully utilized through technological means, so the existing biomass activated carbon preparation technology only solves the problem of the utilization of cotton straw, and does not make full use of the microscopic characteristics of the tissue structure of biomass materials. Biomass Micropore Structure and Micropore Surface Area

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Take 1.0t of cotton stalk as the precursor material of activated carbon, and the pretreatment steps are as follows:

[0036] (1) Raw material preparation: the 0.3t leather material obtained after separating the cotton straw raw material from the skin and core and removing peaches, leaves, and twigs is crushed to a particle size of 5-15mm, sieved to remove dust and impurities, and the particle size is larger than 15mm. The leather is returned to continue crushing, and the unqualified materials with a size less than 5mm are discarded;

[0037] (2) Clean water rinsing: Rinse the material and dehydrate to a water content of approx.

[0038] (3) Kneading and heap leaching: mechanically knead the material until it is divided into filaments, add 5% NaOH weak alkali solution of pH 8 and then heap leaching for 24 hours, squeeze out excess liquid, and heap leaching for 42 hours again;

[0039] (4) Detonation treatment: put the material into a closed pressure vessel, feed high-pr...

Embodiment 2

[0046] Take 1.0t of cotton stalk as the precursor material of activated carbon, and the pretreatment steps are as follows:

[0047] (1) Raw material preparation: the cotton straw raw material is separated from the skin and core, and 0.5t of core material obtained after removing peaches, leaves, and twigs is crushed to a particle size of 5mm-15mm, and dust and impurities are screened to remove dust and impurities, and the particle size is larger than 15mm. The leather is returned to continue crushing, and the unqualified materials with a size less than 5mm are discarded;

[0048] (2) Clean water rinsing: the material is rinsed with water, and then dehydrated;

[0049] (3) Kneading and heap leaching: adding 3% NaOH weak alkali solution of pH9 to the material and then heap leaching for 48 hours, mechanically kneading until it is separated, extruding excess liquid, and heap leaching for 30 hours again;

[0050] (4) Detonation treatment: put the material into a closed pressure vesse...

Embodiment 3

[0056] Example 3 Take 1.0t of cotton stalks as the precursor material of activated carbon, and the pretreatment steps are as follows:

[0057] (1) Raw material preparation: take a certain amount of cotton stalks, directly crush them to a particle size of 5-15 mm without separating the skin and core, and sieve to remove dust and impurities if the particle size is larger than 15 mm;

[0058] (2) Clean water rinsing: Rinse the material and dehydrate to a water content of approx.

[0059] (3) Kneading and heap leaching: add 1% NaOH weak alkali solution of pH 9.5 to the material and then heap leaching for 48 hours, mechanically knead until it is separated, squeeze out excess liquid, and then heap leaching for 42 hours;

[0060] (4) Detonation treatment: put the material into a closed pressure vessel, feed high-pressure steam, keep the air pressure at 1.0MPa for 5 minutes, release the material and steam in 60ms and release the pressure to normal pressure, and the material explodes; ...

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Abstract

The invention belongs to the field of activated carbon and particularly relates to a pretreatment method for preparing high-specific surface-area multi-hole activated carbon with cotton stalks. The pretreatment method includes: 1), smashing the cotton stalks into particles and screening to remove impurities; 2), rinsing materials prior to dehydrating; 3), adding the materials into an alkalescent solution for dump leaching, rubbing the materials mechanically to divide the same into threads, extruding excess fluid and performing dump leaching once more; 4), placing the materials into a closed pressure vessel, feeding high-pressure steam 1.0-2.5MPa in atmospheric pressure for 5-20 minutes, releasing the materials and the steam prior to releasing pressure to normal pressure and allowing the materials to come out; 5), rinsing with deionized water and performing dehydrating; 6), performing uniform drying. By the arrangement, natural microchannel structure of the cotton stalks can be effectively utilized and expanded, the specific surface area is increased, quality raw materials are provided for low-cost subsequent preparation of high-specific surface-area multi-hole activated carbon process, usage of activating agents in the subsequent process is low, and the pretreatment method is simple in activating process, high in sustainability and suitable for scale production.

Description

technical field [0001] The invention belongs to the technical field of activated carbon preparation, in particular to a pretreatment method for preparing high specific surface hierarchical porous activated carbon with cotton straw. Background technique [0002] Activated carbon material is a new type of material system developed in the 20th century. As a non-metallic porous carbon material, its notable feature is that it has a regular arrangement, adjustable size, and highly developed pore structure, so it has a high specific surface area and a large adsorption capacity. It has a wide range of applications in many fields such as macromolecular catalysis, adsorption and separation, nanomaterial assembly, and biochemistry. At present, it also shows good performance in fuel cells, electrocatalysis, hydrogen storage, photonic crystals, electric double layer capacitors, and supercapacitors. application prospects. However, its high manufacturing cost greatly limits its developmen...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B32/324C01B32/348
CPCC01P2006/12C01P2006/14C01P2006/16
Inventor 石勇任铁真
Owner 新疆弘瑞达纤维有限公司
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