Synthesis method for urease inhibitor and application of urease inhibitor

The technology of a urease inhibitor and a synthesis method, which is applied in the synthesis field of urease inhibitors, can solve the problems of low utilization rate, difficult use, thermal instability and the like, and achieves the effects of good finished product quality, short processing flow and low cost.

Inactive Publication Date: 2016-01-20
ZHEJIANG AOFUTUO CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, n-butylthiophosphoric triamide will be completely decomposed within one hour at a temperature of 130°C, and it will decompose slowly even at a normal temperature of 25°C, and it will decompose about 30% within one month. This thermal instability performance, resulting in narrow use area, difficult use and low utilization rate

Method used

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  • Synthesis method for urease inhibitor and application of urease inhibitor
  • Synthesis method for urease inhibitor and application of urease inhibitor
  • Synthesis method for urease inhibitor and application of urease inhibitor

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Experimental program
Comparison scheme
Effect test

Embodiment 1-6

[0031] Embodiment 1-6: the impact of main raw material addition amount on yield

[0032] The raw materials are mainly n-propylamine and trichlorophosphoric acid. In this embodiment, the addition ratio is mainly reflected by n-propylamine. The addition amount of each component (trichlorophosphoric acid: n-propylamine: NaOH is the molar ratio) and its influence on the yield and purity are shown in Table 1.

[0033] Table 1 The impact of different addition ratios on the yield

[0034]

[0035]n-Propylamine and parathion trichloride participate in the reaction, fixed at a certain temperature, under the conditions of 20 seconds of reaction time, when n-propylamine is a small amount, the content of impurity thiophosphoric triamide in the product rises, and the yield decreases; when n-propylamine is excessive , the impurity di-n-propylthiophosphoric triamide amount rises in the product, and the product yield declines; as can be seen from Table 1, when n-propylamine: phosphorus tr...

Embodiment 7-9

[0036] Embodiment 7-9: the influence of reaction atmosphere pressure on yield

[0037] In the reaction process, pressure, as the driving force of material transportation, will directly affect the transfer of materials and the reaction time. n-Propylamine and phosphorous trichloride participate in the reaction, at a fixed feed ratio and kept at a certain temperature, the impact of reaction atmosphere pressure on the yield is shown in Table 2 (trichlorophosphoric acid: n-propylamine: NaOH is the molar ratio, and the pressure unit is MPa).

[0038] The impact of different reaction pressures on the yield in table 2

[0039]

[0040] In this application, the pressure of the reaction atmosphere is the internal pressure of the microchannel. When the back pressure valve of the microchannel reactor is controlled to 0-0.5MPa, the time for materials to pass through the reactor normally is 10-15s for one module and 20-30s for two modules. Shown in conjunction with table 2, because wh...

Embodiment 10-15

[0040] In this application, the pressure of the reaction atmosphere is the internal pressure of the microchannel. When the back pressure valve of the microchannel reactor is controlled to 0-0.5MPa, the time for materials to pass through the reactor normally is 10-15s for one module and 20-30s for two modules. Shown in conjunction with table 2, because when passing through a module, residence time 10-15s, reaction does not reach completely, so yield is low; When passing through two modules, residence time reaches 20-30s, yield can have larger Improve; when the control back pressure valve is 0MPa, the time for the material to pass through one module in the microchannel is 10s, and the time for passing through two modules is 20s. At this time, the material can completely react, and the product yield can reach 89%; When the number of modules increases the reaction time, because there is almost no back-mixing phenomenon in the channel, increasing the residence time has almost no eff...

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Abstract

The invention relates to a synthesis method for urease inhibitor and application of the urease inhibitor and belongs to the technical field of fertilizer synergists. The synthesis method includes the steps that n-propylamine / n-butylamine and phosphorus oxychloride serve as initial raw materials and are mixed with a solvent respectively to form two mixtures; an acid-binding agent is added to the two mixtures, the first temperature process temperature is adjusted to 10-50 DEG C, pressure is controlled to 0-0.5 MPa, after a first temperature process reaction, the temperature is reduced to 0-30 DEG C, and ammonia gas is introduced for a second temperature process reaction; a crude product is obtained after the second temperature process reaction is completed, and the finished product is obtained after the crude product is layered and then treated. The synthesis method is applied to preparation of the urease inhibitor and special urea and has the advantages of being short in processing flow, fewer in product impurities, high in utilization rate and good in heat stability, achieving continuous production and the like.

Description

technical field [0001] The invention relates to a synthesis method and application of a urease inhibitor, and belongs to the technical field of fertilizer synergists. Background technique [0002] In the 1980s, with the widespread use of chemical fertilizers, grain production has generally increased. According to the estimates of the Food and Agriculture Organization of the United Nations, 55% of the increase in food production in developing countries comes from the role of chemical fertilizers. At present, the annual output of nitrogen fertilizer in my country is about 50 million tons (converted to pure nitrogen), among which the output of urea has exceeded 30 million tons (converted to pure nitrogen). Agricultural nitrogen exists in the form of fertilizers, but urea is generally poorly utilized by crops. In farmland, the utilization rate of urea is usually only 30%-35%. After urea is applied to the soil, it is rapidly hydrolyzed into NH under the action of urease in the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07F9/22C05G3/08C05G3/90
CPCY02P20/10
Inventor 戴峰戴稼本戴舒天戴亦能
Owner ZHEJIANG AOFUTUO CHEM
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