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Volatile pollutant treatment method of solvent type coating preparation workshop

A technology of volatile pollutants and treatment methods, applied in the field of VOC purification treatment, can solve the problems of difficult operation cost, poor purification effect, high operation cost, etc., and achieve strong operation convenience, outstanding environmental protection benefits, and strong cost advantage effect

Inactive Publication Date: 2015-01-28
CHENGDU STAR TECH IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although there are many technologies for purifying VOC in the prior art, these technologies either have problems of complicated process and high operating cost, or have problems of poor purification effect, and it is difficult to balance low operating cost and excellent performance. Purification effect

Method used

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  • Volatile pollutant treatment method of solvent type coating preparation workshop
  • Volatile pollutant treatment method of solvent type coating preparation workshop
  • Volatile pollutant treatment method of solvent type coating preparation workshop

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0082] Such as figure 1 , 5 As shown, a solvent-based paint preparation workshop 100 has 14 paint mixing tanks 110 in total. When the VOC concentration detection device 280 detects that the VOC concentration in the workshop reaches 200mg / Nm 3 , that is to start the fan to exhaust, so that the gas emitted by the paint mixing tank 110 is absorbed by the suction hood 210 corresponding to each paint mixing tank 110 and enters the adsorption tower 250 through a closed pipeline for processing. Before the gas enters the adsorption tower 250, it is processed by the mechanical dust collector 240. The mechanical dust collector 240 specifically adopts figure 1 structure shown in . The gas after being adsorbed and purified by the adsorption tower 250 is directly discharged to the outside atmosphere, and the VOC concentration in the discharged gas is kept at ≤130mg / Nm 3 . 700kg activated carbon is housed in the adsorption tower 250 . After the solvent-based paint preparation workshop...

Embodiment 2

[0084] The difference from Example 1 is only that the formulation of the activator is different. The activator in Example 2 is formed by mixing 2% by weight of ammonium chloride, 5% by weight of phosphoric acid, 2% by weight of oxalic acid and deionized water of the remaining weight. Also after accumulatively producing 5,000 tons of solvent-based coatings, the activated carbon regenerated for the fifth time was tested, and its adsorption performance remained at 93% of the original adsorption performance.

Embodiment 3

[0086] Such as figure 1 , 3 As shown, a solvent-based paint preparation workshop 100 has 14 paint mixing tanks 110 in total. When the VOC concentration detection device 280 detects that the VOC concentration in the workshop reaches 200mg / Nm 3 , that is to start the fan to exhaust, so that the gas emitted by the paint mixing tank 110 is absorbed by the suction hood 210 corresponding to each paint mixing tank 110 and enters the adsorption tower 250 through a closed pipeline for processing. Before the gas enters the adsorption tower 250, it is processed by the mechanical dust collector 240. The mechanical dust collector 240 specifically adopts image 3 structure shown in . The gas after being adsorbed and purified by the adsorption tower 250 is directly discharged to the outside atmosphere, and the VOC concentration in the discharged gas is kept at ≤120mg / Nm 3 . 700kg anhydrous calcium chloride is housed in the adsorption tower 250 . After 800 tons of solvent-based paints a...

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Abstract

The invention discloses a volatile pollutant treatment method of a solvent type coating preparation workshop, which has low operation cost and good purification treatment effect. The volatile pollutant treatment method particularly comprises the following steps that volatile pollutants are adsorbed and led to an adsorption tower through an air suction cover arranged above a paint mixing tank and gas exhausting equipment connected with the air suction cover; and adsorption filling adopts active carbon. An active carbon regeneration process comprises the following steps: (1) mixing the active carbon with an organic solvent liquid phase; (2) washing the active carbon with NaOH water solution with the mass percent of 1%-2%; (3) carrying out water washing and filtering on the active carbon and carrying out activation reaction in the active carbon according to the ratio of the weight of the active carbon to the weight of an activating agent of (10-18) to 1; and (4) after the reaction, carrying out water washing, filtering and drying on the active carbon to obtain the regenerated active carbon, wherein the activating agent is prepared by mixing the following components based on the weight of ammonium: 0.2%-1% of ammonium salt, 4%-10% of phosphoric acid, 1%-5% of oxalic acid and the balance of de-ionized water.

Description

technical field [0001] The invention relates to a purification treatment technology for volatile pollutants of solvent-based coatings, in particular to a purification treatment technology for VOC (Volatile Organic Compounds, ie, volatile organic compounds) generated in the preparation and coating process of solvent-based coatings. Background technique [0002] Solvent-based coatings are known to have environmental pollution problems. Nevertheless, because solvent-based coatings have obvious advantages over water-based coatings in performance, solvent-based coatings still have a certain range of applications. The VOC produced during the preparation and coating of solvent-based coatings is the main cause of environmental pollution caused by the coatings. Although there are many technologies for purifying VOC in the prior art, these technologies either have problems of complicated process and high operating cost, or have problems of poor purification effect, and it is difficul...

Claims

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Application Information

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IPC IPC(8): B01D53/04B01J20/20B01J20/34
Inventor 胡宗伟
Owner CHENGDU STAR TECH IND
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