Method for producing N-butyl-phosphorothioic triamide n-(n-butyl)thiophosphoric triamide

Abstract

The invention relates to a production method of N-normal-butyl thiophosphoryl triamine, comprising the following steps: dehydrating raw materials to control the water content to be within a required range, mixing phosphorus thiochloride with tetrahydrofuran, stirring the mixture, lowering the temperature, adding a mixture of n-butylamine, triethylamine and tetrahydrofuran in the mixture of the phosphorus thiochloride and the tetrahydrofuran by means of slow dripping, keeping a certain reaction temperature for 1-8h to obtain a white turbid liquid; leading ammonia gas into the a reaction system under the normal atmosphere, controlling the lead-in speed of ammonia gas, and keeping the temperature of the reaction system for 1-5h; centrifugating the reaction liquid to separate solid generated in the reaction system, distilling an obtained organic liquid in a decompression mode to remove most of the solvent and obtain a crude product, recrystallizing and refining the crude product to obtain a refined product with the purity higher than 99 percent. The invention has the advantages of wide raw material source, short process, simple operation, low cost, no three waste discharge, high economical benefit, applicability for industrial production, and the like.

Description

Technical field: [0001] The invention relates to a method for producing chemical fertilizer urease inhibitors, in particular to a method for producing N-butyl thiophosphoric triamide. Background technique: [0002] At present, domestic and foreign scholars' research on urease / nitrification inhibitors has focused on its inhibition of urea hydrolysis process and nitrification-denitrification process. From an agronomic sense, the beneficial effect of inhibitors is to ensure the effect of soil nitrogen on crops. Continue to supply and reduce its total loss. Studies have shown that the best inhibitory effects among inorganic compounds are silver salts and mercury salts. Among organic compounds, dihydric phenols and quinones, such as hydroquinone (HQ), catechol and p-benzoquinone, have the most inhibitory effects. In the past 10 years, domestic and foreign studies have shown that N-butyl thiophosphoric triamide is a highly effective urease inhibitor. N-Butylthiophosphoric triamide can ...

AI Technical Summary

Problems solved by technology

The report of [Publication No. CN101337976A] uses excessive alkylamine as the acid-binding agent. During the whole process, it has been washed with water twice, extracted, and dried. The resulting product yield is very low, the operation steps are cumbersome, the process flow is long, and three wastes are discharged. The amount is large, and solvents that do not meet environmental protection requirements are also used