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A biological trickle bed and toluene waste gas recovery and treatment system and method

A waste gas recovery and treatment system technology, applied in the direction of gas treatment, separation methods, chemical instruments and methods, etc., can solve the problems of waste of methanol and water resources, attenuation of adsorption performance, low methanol content, etc., to reduce operating costs and improve absorption The effect of stable rate and intake air volume

Active Publication Date: 2021-10-22
WANHUA CHEM GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The disadvantage of this method is that the generated toluene wastewater needs to be further treated, and the activated carbon undergoes frequent thermal regeneration, the adsorption performance decays very quickly, and it needs to be replaced regularly, resulting in high treatment costs.
[0004] Chinese patent CN 105056706A discloses a system and method for recovering methanol in exhaust gas by secondary absorption method. However, in order to ensure that the outlet exhaust gas is discharged up to the standard, a large amount of water needs to be sprayed, and the content of methanol in the absorption liquid is low. Economical, it can only be treated as wastewater, causing waste of methanol and water resources

Method used

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  • A biological trickle bed and toluene waste gas recovery and treatment system and method
  • A biological trickle bed and toluene waste gas recovery and treatment system and method
  • A biological trickle bed and toluene waste gas recovery and treatment system and method

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preparation example Construction

[0061] Preparation of polyurethane foam:

[0062] First, put polyether polyol and various additives in the container according to the formula amount in Table 1, stir evenly, let stand for 20-30 minutes, then pour toluene diisocyanate (TDI) into the container, and mix at a certain stirring speed Evenly, quickly pour it into a self-made foaming box for foaming. The foam is matured at room temperature. After 24 hours, it is stripped and sliced ​​to obtain a network-type soft foam with thicker cells. Soak the soft foam several times in the reticulation solution (as shown in Table 2) at 30°C, take it out and squeeze it repeatedly to remove the reticulation solution, then neutralize it with weak acid, wash it with water for 2 to 3 times, squeeze it and dry it , to obtain reticulated foam. By controlling the immersion time and / or immersion times in the reticulation solution, the specific surface area of ​​the polyurethane foam is 800-1200m 2 / m 3 .

[0063] Table 1 Polyurethane s...

Embodiment 1

[0071] Composition of waste gas from the tank area: the concentrations of toluene and methanol waste gas are 67g / m3 respectively 3 and 103g / m 3 , and the rest is nitrogen.

[0072] Condensation recovery: the three-stage condensation temperature of toluene waste gas is 1°C, -20°C and -70°C respectively, and the concentration of toluene after condensation is 100mg / m 3 , the recovery rate is 99.8%; the three-stage condensation temperature of methanol waste gas is 1°C, -20°C and -57°C respectively, and the concentration of methanol after condensation is 500mg / m 3 , the recovery rate was 99.4%. Toluene waste gas, methanol waste gas and air are mixed in equal volume and sent to the biological trickling filter bed.

[0073] Biotrickling filter bed treatment: The top and bottom layers of the biotrickling filter bed are filled with polypropylene Pall rings, dimensions The middle layer is filled with plastic suspension ball packing, size The inside of the sphere is filled with po...

Embodiment 2

[0076] Composition of waste gas from the tank area: the concentrations of toluene and methanol waste gas are 67g / m3 respectively 3 and 103g / m 3 , and the rest is nitrogen.

[0077] Condensation recovery: the three-stage condensation temperature of toluene waste gas is 1°C, -20°C and -65°C respectively, and the concentration of toluene after condensation is 130mg / m 3 , the recovery rate is 99.8%; the three-stage condensation temperature of methanol waste gas is 1°C, -20°C and -55°C respectively, and the concentration of methanol after condensation is 570mg / m 3 , the recovery rate was 99.4%. Toluene waste gas, methanol waste gas and air are mixed in equal volume and sent to the biological trickling filter bed.

[0078] Biotrickling filter bed treatment: The top and bottom layers of the biotrickling filter bed are filled with polypropylene Pall rings, dimensions The middle layer is filled with plastic suspension ball packing, size The interior of the sphere is filled with ...

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Abstract

The invention discloses a biological trickle bed, which is provided with fillers, wherein the fillers include composite fillers of polyurethane-supported medical stone, and the composite fillers are prepared by the following methods: (1) The preparation concentration is 1.0-5.0wt% , preferably 2-4wt% polyvinyl alcohol aqueous solution, take the powder particle size not greater than 5 μm, preferably 1-3 μm medical stone ultrafine powder and add it to the polyvinyl alcohol aqueous solution, stir and mix evenly, the obtained In the slurry, the ultrafine powder concentration is 0.5-2.0 wt%, preferably 1-1.5 wt%; (2) soak the polyurethane foam in the slurry, when the adsorption amount of the medical stone reaches a predetermined content; The polyurethane foam is immersed in an aqueous solution containing 0.5-2.5wt%, preferably 1.0-2.0wt% of glutaraldehyde and 0.1-0.5wt%, preferably 0.2-0.4wt% of formic acid for chemical cross-linking treatment to obtain a composite filler. The present invention also provides a toluene waste gas treatment system and method using the biological trickle bed, so as to improve the waste gas treatment effect.

Description

technical field [0001] The invention relates to the field of volatile organic waste gas treatment, in particular to a biological trickle bed and a toluene waste gas recovery and treatment system and method. Background technique [0002] Chemical storage and transportation is an important production link of chemical and pharmaceutical enterprises. Changes in ambient temperature and atmospheric pressure, and material loading and unloading processes will generate a certain amount of storage tank breathing gas, mainly including large breathing and small breathing. Big breathing refers to the breathing during material handling. Small breathing refers to the evaporation loss of oil due to the temperature difference and pressure change of the storage tank. Respiratory loss not only reduces the economic benefits of the enterprise, but also pollutes the environment and damages the health of employees and other people in the surrounding environment. Toluene and methanol are highly v...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D53/84B01D53/72
CPCB01D53/002B01D53/72B01D53/84B01D2251/95B01D2257/70B01D2257/702Y02A50/20
Inventor 段美荣王俊俊张海峰范珍龙张宏科华卫琦
Owner WANHUA CHEM GRP CO LTD