Preparation method and application of a kind of activated carbon modified material

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

Active Publication Date: 2017-01-25
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 a kind of activated carbon modified material
  • Preparation method and application of a kind of activated carbon modified material
  • Preparation method and application of a kind of activated carbon modified material

Examples

Experimental program
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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 modifi...

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Abstract

A preparation method of an activated carbon modified material, comprising the first step of pretreatment of activated carbon, the second step of combined physical and chemical modification of activated carbon, and the like. The present invention adopts the high-temperature water vapor activation method combined with the chemical modification method to modify the pore structure and surface oxygen-containing groups of the pretreated activated carbon, and the prepared activated carbon modified material has an increased number of micropores less than 1 nm , the oxygen-containing groups on the surface are significantly reduced, and it has high-efficiency adsorption performance for methylene chloride under high water content conditions. The preparation process of the invention is simple, the amount of consumable materials is small, and the preparation conditions are mild. The prepared activated carbon modified material has the advantages of large micropore volume, good moisture resistance and stable adsorption performance, which can effectively weaken the influence of water molecules on the adsorption effect of methylene chloride, and make up for the adsorption of target organic compounds by porous carbon materials under the condition of high water content. Insufficient capacity.

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 Patents(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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