N-butyl thiophosphoric triamide hazardous waste resource recovery method

Abstract

The invention relates to an n-butyl thiophosphoric triamide hazardous waste resource recovery method. The n-butyl thiophosphoric triamide hazardous waste resource recovery method comprises the following steps: (1) adding a degradation conversion agent into a reaction kettle, adding n-butyl thiophosphoric triamide hazardous waste, carrying out heating under stirring to 40-45 DEG C, carrying out a heat preservation reaction for 1 hour, carrying out heating to 85-95 DEG C, carrying out a heat preservation reaction for 3 hours so as to respectively obtain ammonia gas and a distillation condensate,introducing ammonia gas into an absorption tower for water absorption, transferring the distillation condensate to a normal-pressure rectifying tower, cooling the reaction kettle by stirring to 25-30DEG C at the same time, refining the distillation condensate at a temperature lower than the boiling point of n-butylamine, wherein a tower top produced liquid is the n-butylamine, and allowing a tower bottom kettle liquid serving as the degradation conversion agent to return to the reaction kettle; and (2) adding a sulfur-fixing agent into the reaction kettle, carrying out a reaction under stirring for 1-2 hours at 35-55 DEG C, carrying out centrifugal separation so as to respectively obtain a filtrate and filter residue, namely calcium superphosphate, and allowing the filtrate serving as the degradation conversion agent to return to the reaction kettle. The method provided by the invention is simple and easy to implement, and can be used for resource recovery treatment of hazardous wastes in production of thiophosphamide agricultural fertilizer synergists.

Description

technical field [0001] The invention relates to the technical field of recycling hazardous waste resources generated in the production process of thiophosphoramide-type agricultural fertilizer synergists, in particular to a method for recycling n-butylthiophosphoric triamide hazardous waste resources. Background technique [0002] As a soil nitrogen fertilizer enzyme inhibitor, n-butylthiophosphoric triamide is highly efficient, non-toxic, has no side effects on the soil, and is naturally degraded into ammonia and phosphorus in the soil. It can also be absorbed by crop roots as a fertilizer and reduce ammonia gas Toxic to seed germination and seedling growth, it is an excellent soil nitrogen fertilizer enzyme inhibitor. N-butyl thiophosphoric triamide can greatly improve the utilization rate of nitrogen fertilizer. [0003] The n-butylthiophosphoric triamide process route uses dichloromethane as a solvent, phosphorus trichloride and n-butylamine are replaced, and ammonia ga...

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Problems solved by technology

[0007] However, the above method has the disadvantages that the square filtrate needs to be neutralized with acid, and it also needs to be treated in a biochemical reaction tank to meet the standard discharge, use a wide variety of Chinese herbal medicines, and be expensive.

Therefore, for n-butyl thiophosphoric triamide production enterprises, the hazardous waste generated in the n-butyl thiophosphoric triamide production process contains a large amount of thiophosphoric triamide derivatives. Recycling will not only pay a huge amount of hazardous waste disposal fees in chemical production, but also waste a lot of resources, which is not conducive to the sustainable development of enterprises and does not take advantage of the sustainable development of the environment

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