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Device and method for industrially producing urea ammonium nitrate solution to reduce biuret formation

A technology of urea ammonium nitrate and biuret, which is applied in the field of chemical fertilizers, can solve the problems of obvious increase, generally reaching 0.5-1.5%, crystallization of urea solution, and long urea residence time, so as to improve product quality and long residence time , Optimize the effect of production control

Inactive Publication Date: 2017-01-04
ANHUI WANBEI COAL REFCO GRP LTD HANSHAN HENGTAI NONMETALLIC MATERIALS BRANCH
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AI Technical Summary

Problems solved by technology

If the temperature is too low, the urea solution will crystallize, block the pipeline, and the production cannot proceed
During the production and preparation of UAN, since the temperature of the urea solution is around 100-120°C, if the heat preservation vapor pressure temperature and pressure used for production are high, the amount of Bi produced will increase significantly, generally reaching 0.5-1.5%, resulting in unqualified product quality
[0005] Industrial production of UAN is generally carried out simultaneously in ammonium nitrate and urea production units. The urea delivery pipeline is long, and the urea stays in the delivery pipeline and UAN preparation tank for a long time. The combined effect of high temperature and residence time will lead to the increase of Bi in UAN products. obvious

Method used

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  • Device and method for industrially producing urea ammonium nitrate solution to reduce biuret formation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 2

[0044] The difference from Example 1 is that the heating steam described in step (a) has a steam pressure of 0.3 MPa and a temperature of 130° C.; the steam heating coil uses a steam pressure of 0.3 MPa and a temperature of 130° C.; the step ( The concentration of the urea solution in c) is 68%, and the temperature of the liquid ammonium nitrate solution is 160°C.

[0045] Sampling and analysis of the UAN solution product shows that the Bi index in the product is less than 0.4%.

Embodiment 3

[0047] The difference from Example 1 is that the heating line 7 is a steam jacketed heating line, and the concentration of the urea solution in step (c) is 68%.

[0048] Sampling and analysis of the UAN solution product shows that the Bi index in the product is less than 0.4%.

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Abstract

The invention provides a device for industrially producing urea ammonium nitrate solution to reduce the generation of biuret, comprising a urea solution tank, a urea solution pump, a urea ammonium nitrate preparation tank, a urea ammonium nitrate solution pump, a cooler and a delivery pipeline. The bottom of the urea solution tank is connected to the inlet of the urea solution pump through a pipeline, and the urea solution pump is connected to the inlet of the urea ammonium nitrate preparation tank through a delivery pipeline, and a heating pipeline is arranged outside the delivery pipeline, and the urea ammonium nitrate The bottom of the preparation tank is connected to the inlet of the urea ammonium nitrate solution pump through a pipeline, and the urea ammonium nitrate solution pump is connected to the inlet of the cooler through a pipeline, and the pipeline between the urea ammonium nitrate solution pump and the cooler is connected to the urea ammonium nitrate solution pump. The ammonium nitrate solution product delivery pipeline is connected, and the cooler is connected to the top inlet of the urea ammonium nitrate preparation tank through the pipeline. The device of the invention optimizes the production control, reduces the generation of biuret, and effectively improves the product quality. The present invention also provides a method for using the above device.

Description

technical field [0001] The invention belongs to the field of chemical fertilizers, in particular to a device and a method for reducing the generation of biuret by industrially producing urea ammonium nitrate solution (UAN). Background technique [0002] Urea Ammonium Nitrate solution (Urea Ammonium Nitrate solution), referred to as UAN solution, also known as nitrogen solution (N solution) abroad, is prepared from urea, ammonium nitrate and water. UAN solution is a stable, colorless, atmospheric liquid nitrogen fertilizer. Due to high temperature or long residence time in industrial production, a certain amount of biuret will be generated. [0003] Biuret (English abbreviation Bi) is a by-product in the production of urea, and the molecular formula of biuret is C 2 h 5 N 3 o 2 . In the process of UAN production, if the temperature is controlled too high, urea will undergo condensation reaction to form Bi. When the content of Bi is too high, it will be toxic to crops an...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C05C13/00
Inventor 高峰张静忠马艳春张军董梅生
Owner ANHUI WANBEI COAL REFCO GRP LTD HANSHAN HENGTAI NONMETALLIC MATERIALS BRANCH
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