Process and device for recovering solvent-containing tail gas in production of control sustained-release fertilizer with envelope

A film-coated controlled-release fertilizer and solvent-containing technology, which is applied in separation methods, chemical instruments and methods, vapor condensation, etc., can solve problems such as solvent waste and unfavorable environmental protection, and achieve the effect of meeting environmental protection requirements.

Active Publication Date: 2009-03-04
KINGENTA ECOLOGICAL ENG GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The vented tail gas of the dissolution kettle used to dissolve the coating material and the solvent tank for storing the solvent often contains a large amount of solvent, and its content is sometimes as high as 5-10%. Even after water condensation, the tail gas still contains about 2% of the solvent. If part of the solvent-containing tail gas is directly emptied, it will not only cause waste of solvent, but also not conducive to environmental protection

Method used

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  • Process and device for recovering solvent-containing tail gas in production of control sustained-release fertilizer with envelope

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] Such as figure 1 As shown, the solvent-containing tail gas recovery device in the production of coated controlled-release fertilizers consists of a circulating water condenser 1, a fan 2, a filter 3, three parallel adsorption tanks 4, a cooler 5, a layered tank 6 and a recovery tank 7, the tail gas outlet of the circulating water condenser 1 communicates with the air inlet of the adsorption tank 4 through the fan 2 and the filter 3, the condensate outlet of the circulating water condenser 1 communicates with the recovery tank 7, and the adsorption The condensate outlet of tank 4 communicates with recovery tank 7 through cooler 5 and stratification tank 6 .

Embodiment 2

[0015] Utilize the device described in embodiment 1 to carry out the recovery of solvent tail gas in the production of coated controlled release fertilizer, the specific operation steps are:

[0016] A. After collecting the solvent tail gas in the production of coated controlled-release fertilizer, it is cooled to below 40°C through the circulating water condenser 1, and part of the solvent is recovered, and the tail gas is pressurized by the fan 2, and the solid impurities are removed by the filter 3, and then sent to the adsorption tank 4;

[0017] B. In the adsorption tank 4, the solvent therein is adsorbed by activated carbon, and the purified gas is discharged directly. A total of three adsorption tanks 4 work in parallel, one of which is for adsorption, and the other two are for desorption and drying, and are switched at regular intervals;

[0018] C. When the adsorption tank 4 is desorbed, water vapor is introduced, and the water vapor passes through the activated carb...

Embodiment 3

[0019] Example 3: 2000m 3 / h Tail gas recovery of tetrachlorethylene.

[0020] A. Set 2000m 3 / h The tail gas containing tetrachlorethylene in the production of coated controlled-release fertilizer is collected and first cooled to below 40°C through the circulating water condenser 1, and the condensed part of tetrachlorethylene is recovered, and the tail gas is then used by B9-19-4.5A fan 2 Pressurize and remove solid impurities through a 100-mesh filter 3 and send it to an adsorption tank 4 with 6 tons of active carbon;

[0021] B. In the adsorption tank 4, the tetrachlorethylene in the tail gas is adsorbed by activated carbon, and the purified gas is discharged directly. A total of three adsorption tanks 4 work in parallel, one of which is for adsorption, and the other two are for desorption and drying, and are switched at regular intervals;

[0022] C. When the adsorption tank 4 is desorbed, water vapor is introduced, and the water vapor passes through the activated carb...

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Abstract

The invention discloses a recycling method and a device for solvent-contained tail gas in a coated controlled release fertilizers production. The solvents-contained tail gas in the coated controlled release fertilizers production is collected and introduced into a circulating water condenser firstly, and then led to an adsorption tank after blower pressurization and impurity elimination by a filter, so that the solvents are absorbed by active carbon; and when the adsorption tank is desorbed, water vapor is introduced to pass through an active carbon bed to desorb the solvents which are absorbed, and after delamination in a delaminating groove through a cooler, the solvents are led to a recycling groove. The method adopts active carbon to absorb and recycle the solvents-contained tail gas, thereby achieving full recycling of the solvents in the tail gas, standard tail gas emission, and environmental friendliness.

Description

technical field [0001] The invention belongs to the technical field of controlled-release fertilizer production, and in particular relates to a method and a device for recovering solvent-containing tail gas in the production of coated controlled-release fertilizers by adopting an activated carbon adsorption method. Background technique [0002] Controlled-release fertilizer is a new type of fertilizer that wraps a special film on the outer layer of traditional fertilizers to control the release rate and amount of nutrients according to the nutrient requirements of crops, so that the nutrient release curve is consistent with crop requirements. The outstanding feature of this fertilizer is that effective nutrients are supplied synchronously according to the growth curve of crops, so that the effective utilization rate of fertilizer nutrients is greatly improved. Under the premise of ensuring crop growth, compared with fertilizers with the same concentration, the utilization rat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D5/00B01D53/04
Inventor 张民高义武吴清伟
Owner KINGENTA ECOLOGICAL ENG GRP
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