Method for producing urea phosphate through vacuum crystallization

A technology of vacuum crystallization and urea phosphate, which is applied in chemical instruments and methods, preparation of urea derivatives, preparation of organic compounds, etc., can solve the problems of long production cycle and slow cooling, achieve low production cost, increase production capacity, crystallization The effect of shortening the time

Active Publication Date: 2010-03-10
WENGFU (GRP) CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Method used

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Embodiment 1

[0014] A method for producing urea phosphate by vacuum crystallization, comprising the steps:

[0015] Take the concentration as 40% (with H 3 PO 4 783.63g of thermal phosphoric acid) was added to a three-necked flask equipped with a stirring device and a vacuum, and the three-necked flask was heated with a thermal insulation heating mantle; the stirring device was started, the speed of the mixer was adjusted to 200rpm, and the temperature was raised to 100 at a rate of 4°C / min. ℃; add 201.50 g of fertilizer grade urea with a N content of 46.4% (the molar ratio of urea to phosphoric acid is 1:1.05), keep the reaction temperature at 100 °C and continue stirring for 120 min, and turn off the heating device. Start the vacuum device (without heating at this time), adjust the vacuum degree to 0.5MPa, and evaporate and concentrate for 60min. After most of the crystals are precipitated (the temperature is 32°C), turn off the vacuum device, separate and dry to obtain 454.88g of the p...

Embodiment 2

[0017] A method for producing urea phosphate by vacuum crystallization, comprising the steps:

[0018] Take the concentration as 58.6% (with H 3 PO 4 753.53g of thermal phosphoric acid) was added to a three-necked flask equipped with a stirring device and a vacuum, and the three-necked flask was heated with a thermal insulation heating mantle; the stirring device was started, and the speed of the mixer was adjusted to 140rpm, and the temperature was raised to 80 at a rate of 4°C / min. ℃; add 351.45 g of fertilizer grade urea with 46.4% N content (the molar ratio of urea to phosphoric acid is 1:1.3), keep the reaction temperature at 80 °C and continue stirring for 50 min, and turn off the heating device. Start the vacuum device (without heating at this time), adjust the vacuum degree to 0.3MPa, evaporate and concentrate for 50min, and when most of the crystals are precipitated (the temperature is 30°C), close the vacuum device, separate and dry to obtain 640.87g of the product ...

Embodiment 3

[0020] A method for producing urea phosphate by vacuum crystallization, comprising the steps:

[0021] Take the concentration as 68.5% (with H 3 PO 4 773.83g of purified phosphoric acid) was added to a three-necked flask equipped with a stirring device and a vacuum, and the three-necked flask was heated with a thermal insulation heating mantle; the stirring device was started, the speed of the mixer was adjusted to 160rpm, and the temperature was raised to 80°C at a rate of 4°C / min Add 454.35 g of fertilizer grade urea with a N content of 46.4% (the molar ratio of urea to phosphoric acid is 1: 1.4), keep the reaction temperature at 80° C. and continue stirring for 45 min, and turn off the heating device. Start the vacuum device (without heating at this time), adjust the vacuum degree to 0.1MPa, evaporate and concentrate for 30min, and when most of the crystals are precipitated (the temperature is 34°C), turn off the vacuum device, separate and dry to obtain 780.00g of the pro...

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Abstract

The invention discloses a method for producing urea phosphate through vacuum crystallization. The method comprises the following steps: adding 36-85wt% of phosphoric acid in a reaction device, starting an agitating device with the rotating speed of 100-200RPM, adding activator accounting for 0-0.012% of phosphoric acid and suspending agent accounting for 0-0.010% of phosphoric acid, heating with the rate of 4 DEG C/MIN to 60-100 DEG C, adding urea of which molar ratio to phosphoric acid is 1.4-1.0, keeping temperature for 30-120MIN, closing the heating device, concentrating under the vacuum degree of 0.01-0.50 MPA for 10-60MIN to obtain urea phosphate crystal paste solution with the solid content of 60-90%, reducing the temperature to 30-40 DEG C under vacuum, closing the vacuum system, separating and drying to obtain the urea phosphate product. The crystallization time of the method of the invention is short, the crystallizer is not easy to form scale, the yield is high, the process is simple and the production cost is low.

Description

technical field [0001] The invention relates to the technical field of chemical industry, in particular to a method for producing urea phosphate by vacuum crystallization. Background technique [0002] Urea phosphate is a coordination complex compound with amino structure formed by the reaction of phosphoric acid and urea. As a fine chemical product widely used in animal husbandry, industry, agriculture and other fields, especially as a statutory first-class additive in the feed industry of the European Community (FAO), it is a special nutritional additive for ruminants recommended by the Food and Agriculture Organization of the United Nations (FAO) and Phosphorus supplements have broad market prospects. [0003] At present, there are many methods for producing urea phosphate crystallization, mainly partition wall or coil cooling crystallization. In this method, because the crystals are preferentially precipitated on the inner wall of the crystallizer or the outer surface ...

Claims

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Application Information

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IPC IPC(8): C07C275/02C07C273/02
Inventor 解田张群王书林杨帆李天祥刘飞史连军
Owner WENGFU (GRP) CO LTD
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