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A method for harmless treatment of n-butylthiophosphoric triamide hazardous waste

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

Active Publication Date: 2021-10-29
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

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Problems solved by technology

But this method has the defect that the filtrate needs to be neutralized with acid and also needs to be treated in a biochemical reaction pool to meet the standard discharge

Method used

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  • A method for harmless treatment of n-butylthiophosphoric triamide hazardous waste

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 a method for harmless treatment of n-butylthiophosphoric triamide hazardous waste, comprising the following steps: (1) adding a degradation conversion agent into a reaction kettle, and adding n-butylthiophosphoric triamide hazardous waste , stirred and heated to obtain ammonia gas and distillation condensate respectively; ammonia gas is passed into the absorption tower to be absorbed by water; The liquid is refined below the boiling point of n-butylamine, the output liquid at the top of the tower is n-butylamine, and the liquid at the bottom of the tower is returned to the reactor as a degradation conversion agent; Stir and react at ~55°C for 1~2h to obtain hydrogen sulfide; hydrogen sulfide is passed into the ammonia absorption tower for chemical absorption to obtain ammonium sulfide solution with a concentration of 16~20%; the ammonium sulfide solution is centrifuged to obtain filtrate and filter residue respectively. Calcium phosphate; the filtrate is returned to the reactor as a desulfurization conversion agent. The invention does not discharge three wastes and can achieve full resource recovery.

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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Patent Type & Authority Patents(China)
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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