NBPT hazardous waste harmless treatment method

A technology of n-butylthiophosphoric triamide and hazardous waste, applied in chemical instruments and methods, ammonium sulfide/polysulfide, amino compound purification/separation, etc., to achieve the effect of easy implementation and simple method

Active Publication Date: 2020-08-11
甘肃金创绿丰环境技术有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But this method has the defect that the filtrate needs to be neutralized with acid and

Method used

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  • NBPT hazardous waste harmless treatment method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Example 1 A method for harmless treatment of n-butylthiophosphoric triamide hazardous waste, comprising the following steps:

[0020] (1) Add 210kg of quicklime solution with a mass concentration of 40% into the reactor, add 100kg of n-butylthiophosphoric triamide hazardous waste (NBPTHW), stir and heat to 40~45°C, and keep it warm for 1 hour; then heat up to 85~95°C, keep warm for 3 hours until no distillation condensate overflows, and obtain 20kg ammonia gas and 48kg distillation condensate respectively. The ammonia gas is passed into the absorption tower to be absorbed by water, and the mass concentration of the absorbed ammonia water is adjusted to 8-10%, which is used in the subsequent process to absorb hydrogen sulfide; the distillation condensate is n-butylamine aqueous solution.

[0021] The distillation condensate is transferred to the atmospheric distillation column. At this time, the reaction kettle is stirred and cooled to 25°C~30°C; the distillation condens...

Embodiment 2

[0023] Example 2 A method for the harmless treatment of n-butylthiophosphoric triamide hazardous waste, comprising the following steps:

[0024] (1) Add 240kg of quicklime solution with a mass concentration of 35% into the reactor, add 100kg of n-butylthiophosphoric triamide hazardous waste (NBPTHW), stir and heat to 40~45°C, and keep it warm for 1 hour; then heat up to 85~95°C, keep warm for 3 hours until no distillation condensate overflows, and obtain 20kg ammonia gas and 48kg distillation condensate respectively. The ammonia gas is passed into the absorption tower to be absorbed by water, and the mass concentration of the absorbed ammonia water is adjusted to 8-10%, which is used in the subsequent process to absorb hydrogen sulfide; the distillation condensate is n-butylamine aqueous solution.

[0025] The distillation condensate is transferred to the atmospheric distillation column. At this time, the reaction kettle is stirred and cooled to 25°C~30°C; the distillation con...

Embodiment 3

[0027] Example 3 A method for the harmless treatment of n-butylthiophosphoric triamide hazardous waste, comprising the following steps:

[0028] (1) Add 296kg of slaked lime solution with a mass concentration of 30% into the reactor, add 100kg of n-butylthiophosphoric triamide hazardous waste (NBPTHW), stir and heat to 40~45°C, and keep it warm for 1 hour; then heat up to 85~95°C, keep warm for 3 hours until no distillation condensate overflows, and obtain 20kg ammonia gas and 48kg distillation condensate respectively. The ammonia gas is passed into the absorption tower to be absorbed by water, and the mass concentration of the absorbed ammonia water is adjusted to 8-10%, which is used in the subsequent process to absorb hydrogen sulfide; the distillation condensate is n-butylamine aqueous solution.

[0029] The distillation condensate is transferred to the atmospheric distillation column. At this time, the reaction kettle is stirred and cooled to 25°C~30°C; the distillation c...

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Abstract

The invention relates to an NBPT hazardous waste harmless treatment method. The NBPT hazardous waste harmless treatment method comprises the following steps that firstly, a degradation transforming agent is added in a reaction kettle, NBPT hazardous waste is added, stirring and heating are conducted, ammonia and distilled condensate liquid are obtained, an absorption tower is inflated with the ammonia for water absorption, the distilled condensate liquid is transferred into a normal-pressure rectifying tower, the reaction kettle is subjected to stirring cooling to 25 DEG C-30 DEG C, the distilled condensate liquid is refined at the temperature lower than the n-butylamine boiling point, tower roof extracted liquid is n-butylamine, and tower bottom kettle liquid serves as the degradation transforming agent to return into the reaction kettle; and secondly, a desulfuration transforming agent is added into the reaction kettle with 10 kg/min, the stirring reaction is conducted at 35-55 DEG Cfor 1-2 h, hydrogen sulfide is obtained and led into an ammonium hydroxide absorption tower for chemical absorption, an ammonium sulfide solution with the concentration being 16-20% is obtained, theammonium sulfide solution is subjected to centrifugal separation, filter liquor and filter residue calcium superphosphate are obtained, and the filter liquor serves as the desulfuration transforming agent to return into the reaction kettle. The NBPT hazardous waste harmless treatment method is free of three-waste emission and can reach all resource recycling.

Description

technical field [0001] The invention relates to the technical field of hazardous waste treatment produced in the production process of thiophosphoramide-type agricultural fertilizer synergists, in particular to a harmless treatment method for n-butylthiophosphoric triamide (NBPT) hazardous waste . Background technique [0002] NBPT is currently one of the most effective soil urease inhibitors. Under normal use, agricultural nitrogen fertilizers are quickly decomposed by urease in the soil, and the short-term use of nitrogen fertilizers will waste a lot of resources, increase crop production costs, and bring a series of problems such as soil compaction and environmental pollution. NBPT can inhibit and slow-release the decomposition of nitrogen fertilizer by urease in the soil. On the one hand, it can effectively slow down the enzymatic decomposition process of nitrogen fertilizer into ammonia and reduce waste. On the other hand, it can prolong the diffusion time of nitrogen ...

Claims

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Application Information

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IPC IPC(8): B09B1/00B09B3/00B09B5/00C07C209/62C07C209/82C07C209/84C07C209/86C07C211/03C01C1/20C01B15/16
CPCB09B1/004B09B3/00B09B5/00C01B15/16C01C1/20C07C209/62C07C209/82C07C209/84C07C209/86C07C211/03
Inventor 胡晓娇王有治张生萍白艳萍崔锦峰杨保平郭军红李慧茹李红王翔
Owner 甘肃金创绿丰环境技术有限公司
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