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Preparation method and application of modified activated carbon material

A modified material and activated carbon technology, which is applied in the preparation of halogenated hydrocarbons, chemical instruments and methods, organic chemistry, etc., can solve the problems of small adsorption capacity of dichloromethane, poor adsorption selectivity, weakened adsorption performance, etc. The effect of group reduction, high adsorption capacity, and stable adsorption capacity

Active Publication Date: 2015-01-14
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although dichloromethane is of low toxicity, it can decompose hydrochloric acid, carbon dioxide, carbon monoxide and highly toxic phosgene when it enters the human body when exposed to heat and humidity, which will aggravate the harm to humans.
Existing activated carbon materials have disadvantages such as small adsorption capacity and poor adsorption selectivity for dichloromethane, and in order to reuse activated carbon for adsorption and recovery of dichloromethane, the activated carbon material must be desorbed with water vapor after the activated carbon is saturated. , blow dry and cool down for the next adsorption
Such technology will lead to high water content of the adsorption material during the recycling process, and in the case of high water content, the adsorption performance of existing activated carbon materials for methylene chloride will be significantly weakened

Method used

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  • Preparation method and application of modified activated carbon material
  • Preparation method and application of modified activated carbon material
  • Preparation method and application of modified activated carbon material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] A preparation method of activated carbon modified material, comprising the following steps:

[0028] The first step is the pretreatment of activated carbon. With a specific surface area of ​​1200m 2 / g of coal-based columnar activated carbon (HZ-8040, Ningxia Guanghua Qisi Activated Carbon Co., Ltd., Ф2-3mm) is used as the modified raw material, first impregnated with 1mol / L sodium hydroxide solution and shaken for 12h, then filtered and washed Until the filtrate is neutral, then immerse and vibrate with 3.83wt% hydrochloric acid solution for 12 hours, filter, wash until the filtrate is neutral, put the sample into a beaker, add an appropriate amount of deionized water, and then place it in an ultrasonic instrument with a power of 700W for 30 minutes , filtered and dried in a drying oven at 120°C for 24 hours, and finally the pretreated sample was stored in a desiccator for future use.

[0029] The second step is the physical and chemical modification of activated car...

Embodiment 2

[0031] A preparation method of activated carbon modified material, comprising the following steps:

[0032] The first step is the pretreatment of activated carbon. Coal-based columnar activated carbon (HZ-8040, Ningxia Guanghua Qisi Activated Carbon Co., Ltd., Ф2-3mm) with a specific surface area of ​​1200m2 / g was used as the modified raw material, and the sodium hydroxide solution with a concentration of 2mol / L was first impregnated and shaken for 10h , then filter, wash until the filtrate is neutral, then immerse and vibrate with 5wt% hydrochloric acid solution for 10h, filter, wash until the filtrate is neutral, put the sample into a beaker, add an appropriate amount of deionized water, and then place it in an ultrasonic wave with a power of 1000W Wash in the instrument for 30 minutes, filter and dry in a 100°C drying oven for 24 hours, and finally store the pretreated sample in a desiccator for future use.

[0033] The second step is the physical and chemical modification...

Embodiment 3

[0035] A preparation method of activated carbon modified material, comprising the following steps:

[0036] The first step is the pretreatment of activated carbon. With a specific surface area of ​​1500m 2 / g Coconut shell columnar activated carbon (BL-S2X, Osaka Gas Co., Ltd., Japan, Ф2-3mm) is used as the modified raw material and is impregnated and shaken for 12 hours in a sodium hydroxide solution with a concentration of 1mol / L, then filtered and washed until the filtrate If it is neutral, then immerse and shake it with 3.83wt% hydrochloric acid solution for 12 hours, filter, wash until the filtrate is neutral, put the sample into a beaker, add an appropriate amount of deionized water, and then place it in an ultrasonic instrument with a power of 700W for 60 minutes, filter After that, it was dried in a drying oven at 120°C for 24 hours, and finally the pretreated sample was stored in a desiccator for future use.

[0037] The second step is the physical and chemical modif...

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Abstract

The invention discloses a preparation method of a modified activated carbon material. The preparation method comprises the following steps: firstly, preprocessing activated carbon, and secondly performing physical and chemical joint modification on the activated carbon. According to the preparation method, a high-temperature water vapor activating method and a chemical modification method are combined to modify the preprocessed activated carbon in terms of a pore structure and surface oxygen-containing groups; according to the prepared modified activated carbon material, the number of micropores with particle size being less than 1nm is increased and the number of the surface oxygen-containing groups is remarkably reduced. The modified activated carbon material has high-efficiency adsorption performance for dichloromethane under the condition of high water content. The preparation method is simple in preparation process, low in material consumption and mild in preparation condition. The prepared modified activated carbon material has the advantages of large micropore capacity, good moisture resistance, stable adsorption performance and the like, and is capable of effectively weakening the influence of water molecules on the dichloromethane adsorption effect, thereby making up the defect of small adsorption capacity of a porous carbon material for target organic matters under the condition of high water content.

Description

technical field [0001] The invention relates to a preparation method and a use method of a novel activated carbon modified material, in particular to a preparation method of a novel activated carbon modification and a use method for absorbing and recovering dichloromethane under high water content conditions. Background technique [0002] As a lipophilic solvent, dichloromethane (DCM) has the characteristics of nonflammability, appropriate boiling point, and economical price, so it is widely used in industrial and civil applications such as rubber, textile industry, and paint removal. Many petrochemical and chemical production processes discharge a large amount of organic waste gas that contains a considerable proportion of DCM. For example, a large amount of dichloromethane waste gas is discharged in the production process of photosensitive film. Although dichloromethane is of low toxicity, it can decompose hydrochloric acid, carbon dioxide, carbon monoxide and highly toxic...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/20B01J20/30C07C19/03C07C17/389
CPCB01J20/041B01J20/20B01J20/3204B01J2220/42B01J2220/4806C07C17/389C07C19/03
Inventor 郑经堂朱超胜江波吴明铂张钦辉谭明慧袁建军孙冠华仇实汪涵杨柳尹华承郑经纬
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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