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Compound depurative preparing method for removing methanol from air

A purifying agent and formaldehyde technology, applied in chemical instruments and methods, separation methods, dispersed particle separation, etc., can solve the problems of not being able to fundamentally eliminate harmful gases, reducing the use efficiency of photocatalysts, and restricting promotion and application. The effect of inhibiting and killing effects, promoting sustainable development, and simplifying production techniques

Inactive Publication Date: 2008-07-23
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Activated carbon adsorption and titanium dioxide photocatalysis are commonly used methods in indoor air purification, but at present, ordinary activated carbon is used for adsorption and removal, or a single photocatalyst is used for catalytic degradation
Indoor formaldehyde and other harmful substances have the characteristics of low concentration, long-term existence and slow release. When ordinary activated carbon is used as an adsorbent, because of the lack of functional groups on the surface that can adsorb and degrade formaldehyde, it is easy to reach saturation in indoor air purification. Therefore, the effect of using ordinary activated carbon to adsorb low-concentration formaldehyde in the room is poor; using a single photocatalyst will easily cause powder agglomeration, resulting in loss of photocatalytic efficacy, and the removal purpose cannot be achieved. In addition, there are certain conditions when using photocatalysts. Restrictions, it needs to be irradiated in the corresponding light wavelength range to achieve the removal effect, thus reducing the use efficiency of photocatalysts in indoor air purification
[0005] Therefore, the method of only using ordinary activated carbon or a single photocatalyst cannot fundamentally eliminate harmful gases such as formaldehyde in indoor air, and there are problems such as incomplete purification, high cost, short duration, and poor recyclability, which limit its promotion. and application

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0020] The waste catalyst of activated carbon loaded with zinc acetate in the production of vinyl acetate is crushed into a particle size of 0.7-0.05mm and put into the roasting furnace. When the temperature range is 80-250°C, the heating rate is 80°C / min, and it is kept at 250°C for 120min. During this process, keep the furnace under negative pressure; in the temperature range of 250-400 °C, the heating rate is 5 °C / min, and ammonia gas is introduced during this process, the gas flow rate is 15 ml / min, and the temperature is kept at 400 °C for 200 min; In the temperature range of 400-600°C, the heating rate is 10°C / min, and ammonia gas is introduced at 600°C to ensure that the gas flow rate is 30ml / min, and the time for ammonia gas feeding is 240min: at the end of the process, in nitrogen The composite purifying agent can be obtained by cooling to room temperature at a cooling rate of 20°C / min in the atmosphere.

[0021] In a residential bedroom that has been renovated for 5 ...

Embodiment 2

[0023] Preparation of composite gas purifier: use waste activated carbon with a zinc content of 10% as a raw material and put it into a roasting furnace. When the temperature range is 80-250°C, the heating rate is 80°C / min, and it is kept at 250°C for 120 minutes. During this process, keep the furnace under negative pressure; in the temperature range of 250-400 °C, the heating rate is 5 °C / min, and ammonia gas is introduced during this process, the gas flow rate is 15 ml / min, and the temperature is kept at 400 °C for 200 min; In the temperature range of 400-600 °C, the heating rate is 10 °C / min, and ammonia gas is introduced at 600 °C to ensure that the gas flow rate is 30 ml / min, and the time for ammonia gas introduction is 240 min; The composite purifier can be obtained by cooling to room temperature at a cooling rate of 30°C / min in the atmosphere.

[0024] A newly renovated hotel room with various furniture, carpets and bedding, with a usable area of ​​50m 2 , passed the d...

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Abstract

The invention relates to a preparation method of compound purifying agent used for removing formaldehyde from air, belonging to the technical field of metallurgy chemical industry preparation. The invention is suitable for purifying the formaldehyde, etc. various harmful gases in the present family decoration. The compound purifying agent takes waste active carbon containing 5 to 10 percent of zinc as material, and activates and recycles the waste active carbon through decomposing, adulterating, activating and modifying processes, changes the chemical combination state of the zinc in the waste active carbon, simultaneously and leads various functional units which can absorb and degrade the organic volatile matters to be formed on the surface of the active carbon. The invention can adapt to a long existence period and a long release period of indoor air pollutants, and the removal rate to formaldehyde, etc. harmful gases can reach more than 90 percent. .

Description

1. Technical field [0001] The invention relates to a preparation method of a composite purifier for removing formaldehyde in the air, belonging to the technical field of metallurgical and chemical preparation. 2. Background technology [0002] In the vinyl acetate synthesis industry, a large amount of spent catalyst loaded with zinc acetate activated carbon is generated, and the deactivated activated carbon is discarded as waste residue. The composite purifying agent involved in the present invention is made by reprocessing these discarded zinc-containing activated carbons, and is mainly composed of activated carbons and zinc oxide microcrystals. [0003] New home decoration and daily neglect of harmful gases such as formaldehyde slowly released from the degradation of polymer materials, paints, coatings, building materials, etc. According to the statistics of professional testing agencies, the rate of formaldehyde exceeding the standard in newly renovated houses has reached...

Claims

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Application Information

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IPC IPC(8): B01D53/72B01D53/04B01D53/86
Inventor 彭金辉钱天才周烈兴张利波王绍华曲雯雯张正勇李玮张泽彪郭胜惠张世敏解瑞刘秉国
Owner KUNMING UNIV OF SCI & TECH
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