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A treating method for volatile pollutants of solvent-type paint

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

Active Publication Date: 2015-04-01
成都彩星化工有限公司
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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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  • A treating method for volatile pollutants of solvent-type paint
  • A treating method for volatile pollutants of solvent-type paint
  • A treating method for volatile pollutants of solvent-type paint

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 accumulative production of 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 treating method with a low operation cost and ideal cleaning treatment effects for volatile pollutants of solvent-type paint. The method includes leading the volatile pollutants of the solvent-type paint to an adsorption tower through a closed channel by utilization of a gas discharging device. The adsorption tower adopts activated carbon. An activated carbon regeneration process comprises steps of: 1) mixing activated carbon to be regenerated with an organic solvent liquid phase; 2) cleaning activated carbon separated mechanically with an aqueous NaOH solution having a mass concentration of 1-2% or an aqueous KOH solution; 3) after saponification is performed, washing the activated carbon with water, filtering, and adding an activating agent into the activated carbon with the weight ratio of the activated carbon to the activating agent being (10-18) / 1; and 4) after reactions, washing the activated carbon with water, filtering and drying to obtain regenerated activated carbon, wherein the activating agent is prepared by mixing 0.2-1% by weight of an ammonium salt, 4-10% by weight of phosphoric acid and 1-5% by weight of oxalic acid, with the balance being deionized 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): B01D53/04B01D45/08B01D45/02B01J20/34B01J20/20
Inventor 胡宗伟
Owner 成都彩星化工有限公司
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