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Preparation method and application of stepped-pore tobacco stalk carbon

A technology of stepped holes and tobacco rods is applied in the preparation/purification, application, tobacco and other directions of carbon, which can solve the problems of low carbon product yield and equipment corrosion, and achieve the effect of increasing the yield and achieving remarkable effects.

Active Publication Date: 2017-06-30
ZHENGZHOU TOBACCO RES INST OF CNTC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

CN1669918A and Publication No. CN101648707A Because the use of alkali or acid is under high temperature conditions, the problem of corrosion to equipment is serious. In addition, the yield of carbon products is low

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Place the tobacco rod raw material in an oven at 60°C and dry until the moisture content is below 5%, crush and sieve the 20-40 mesh particle powder, weigh 10g of the sample, and mix it with methanol aqueous solution (methanol concentration 5 %wt) were mixed and transferred to a ball mill, 1.0 g of HY molecular sieve (10% of the weight of the tobacco rod) was added and mixed at room temperature for 5 h at a speed of 300 rpm to obtain a feed liquid. The feed liquid was transferred to a high-pressure reactor, and ethylene gas was filled above the reactor at room temperature to 0.2 MPa, and then the temperature was raised to 100°C for 24 h of reaction. The reaction solution was cooled to room temperature and then transferred to a hydrothermal kettle for hydrothermal carbonization at 450 °C for 24 h. Filtrate, soak the solid product in 10 M NaOH solution at room temperature for 1 h, filter, wash with deionized water until neutral, and obtain step-pore carbon material 1#. T...

Embodiment 2

[0026] Put the tobacco rod raw material in an oven and dry at 80°C until the moisture content is below 5%, crush it to 40-60 mesh, weigh 10g of the sample, and mix it with ethanol aqueous solution (ethanol concentration 8%wt) according to the solid-liquid volume ratio of 1:10 ) were mixed and transferred to a ball mill jar, 2.0 g of HZSM-5 molecular sieve (20% of the weight of the tobacco rod) was added and mixed at room temperature for 4 h at a ball mill speed of 400 rpm. The feed liquid was transferred to an autoclave, and butene gas was filled into the autoclave at room temperature to 0.5 MPa, and the reaction was carried out at 150°C for 14 h. The reaction solution was cooled to room temperature and then transferred to a hydrothermal kettle for hydrothermal carbonization at 500 °C for 15 h. Filter, and soak the solid product in 5 M KOH solution at 60°C for 3 h, filter, wash with deionized water until neutral, and obtain step-pore carbon material 2#. The texture parameters...

Embodiment 3

[0028] Place the raw material of the tobacco rod in an oven at 100°C and dry until the moisture content is below 5%, crush it to 60-90 mesh, weigh 10g of the sample, and mix it with propanol aqueous solution (propanol concentration 10%wt) according to the solid-liquid volume ratio of 1:5 ) were mixed and transferred to a ball mill, adding SO 3 0.5 g of H-MCM-41 mesoporous material (5% of the weight of the tobacco rod) was mixed at room temperature for 2 h at a ball milling speed of 200 rpm. The material liquid was transferred to a high-pressure reactor, and pentene gas was filled into the reactor at room temperature to 1.0 MPa, and the reaction was carried out at 200 °C for 24 h. The reaction solution was cooled to room temperature and then transferred to a hydrothermal kettle for hydrothermal carbonization at 600 °C for 5 h. Filter, and soak the solid product in 1 M NaOH solution at 80°C for 5 h, filter, wash with deionized water until neutral, and obtain step-pore carbon ma...

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PUM

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Abstract

The invention provides a preparation method of stepped-pore tobacco stalk carbon. The method is characterized in that a method is used for preparing a stepped-pore carbon material with tobacco stalks as raw materials and comprises the following steps that the tobacco stalks as the raw materials are subjected to partial hydrolysis in an alcohol-water solution environment in the presence of solid acid and alkene, then the temperature is increased for carbonization, and the stepped-pore tobacco stalk carbon material can be obtained after alkali washing and water washing. According to the stepped-pore carbon material prepared through the method, the pores of the material are distributed in micropore, mesoporous, macropore ranges, so that the stepped-pore carbon material is more suitable for absorbing cigarette tar wide in particle size distribution; when the prepared stepped-pore carbon material is added into a cigarette filter tip, the effect of reducing the tar in main stream smoke is obvious, and the reduction rate is 20% or above. The preparation method and application of the stepped-pore tobacco stalk carbon has the advantages that organic acid generated in the process that the solid acid catalyzes the hydrolysis of cellulose is reacted with alcohol to generate ester so that the problem that a reactor is corroded by the organic acid can be avoided. By the addition of the alkene, the solid acid easily catalyzes the hydrolysis of polysaccharide and the carbonization of a hydrolysis product, so that the yield of a carbon product obtained in the subsequent carbonization stage is increased.

Description

technical field [0001] The invention relates to a preparation method and application of step-pore tobacco rod carbon, in particular to a method for preparing a high-porosity step-pore activated carbon material by carbonizing the tobacco rod after pulverization and catalytic hydrolysis. The material can be added to cigarette filters, and has a remarkable effect on reducing smoke tar. Background technique [0002] my country is a big tobacco country in the world, and its planting area, total output, cigarette output and sales volume all rank first in the world. A large amount of waste will inevitably be generated in the tobacco leaf and processing process. According to statistics, the tobacco stem produced in 2015 alone reached 1.163×10 6 Ton. Due to the relatively poor availability of tobacco stalks, most of them are disposed of by landfill or incineration, and the comprehensive utilization rate is extremely low, which not only causes environmental pollution, but also waste...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/05A24D3/16
CPCA24D3/163C01P2006/12C01P2006/14C01P2006/17
Inventor 王金棒程多福高运谦孟庆华高健汪志波邓楠邱纪青刘亚丽洪群业郑路张仕华冯伟华郑新章
Owner ZHENGZHOU TOBACCO RES INST OF CNTC
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