Preparation method for urea ammonium nitrate solution

A technology of urea ammonium nitrate and nitric acid solution, which is applied in the field of preparation of urea ammonium nitrate solution, can solve the problems of low fertilizer efficiency and achieve the effect of increasing yield and improving quality

Active Publication Date: 2012-06-27
CHINA CHENGDA ENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

It is generally used as a topdressing fertilizer in the middle and late stages of rice, and the effect is g

Method used

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  • Preparation method for urea ammonium nitrate solution
  • Preparation method for urea ammonium nitrate solution
  • Preparation method for urea ammonium nitrate solution

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] After the liquefied ammonia from the synthetic ammonia unit 13 is vaporized through the liquid ammonia evaporator 1, the nitric acid solution from the nitric acid unit 14 is neutralized in the first neutralizer 2 to generate ammonium nitrate, and the pH value is adjusted to 5. Ammonia: Nitric acid=1:1.2; the generated ammonium nitrate and the remaining ammonia gas in the reaction enter the separation section of the first neutralizer 2 for separation, ammonium nitrate enters the second neutralizer 3, and ammonia gas enters the washing system 4 for washing and recovery; The required urea solution raw material from the urea production unit 12; put ammonium nitrate: urea=1:1.23 in the second neutralizer (3) for reaction, adjust the pH value to 6.8, and generate urea ammonium nitrate solution; the generated urea The ammonium nitrate solution is cooled to 35 in the urea ammonium nitrate solution washing cooler 8 0 C, output 11; then the tail gas produced in the second neutral...

Embodiment 2

[0033] The liquid ammonia from the synthetic ammonia unit is vaporized through the liquid ammonia evaporator 1 and then neutralized with the nitric acid solution from the nitric acid unit in the first neutralizer 2 to generate ammonium nitrate, and the pH value is adjusted to 6. Ammonia: nitric acid = 1:1.1; the generated ammonium nitrate and the remaining ammonia gas in the reaction enter the separation section of the first neutralizer 2 for separation, ammonium nitrate enters the second neutralizer 3, and ammonia gas enters the washing system 4 for washing and recovery; prepare the required urea Solution raw material; put ammonium nitrate: urea=1:1.33 in the second neutralizer (3) for reaction, adjust the pH value to 7.5, and generate urea ammonium nitrate solution; wash the generated urea ammonium nitrate solution in urea ammonium nitrate solution Cooler 8 cool down to 45 0 C, storage 11; then the tail gas produced in the second neutralizer 3 enters the washing system for w...

example 3

[0035] The liquid ammonia from the synthetic ammonia unit is vaporized through the liquid ammonia evaporator 1 and then neutralized with the nitric acid solution from the nitric acid unit in the first neutralizer 2 to generate ammonium nitrate, and the pH value is adjusted to 5.5. Ammonia: nitric acid = 1:1.15; the generated ammonium nitrate and the remaining ammonia gas in the reaction enter the separation section of the first neutralizer 2 for separation, the ammonium nitrate enters the second neutralizer 3, and the ammonia gas enters the washing system 4 for washing and recovery; prepare the required urea Solution raw material; put ammonium nitrate: urea=1:1.28 in the second neutralizer (3) for reaction, adjust the pH value to 7, and generate urea ammonium nitrate solution; wash the generated urea ammonium nitrate solution in urea ammonium nitrate solution Cooler 8 to cool down to 40 0 C, storage 11; then the tail gas produced in the second neutralizer 3 enters the washing ...

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PUM

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Abstract

The invention especially relates to a preparation method for a urea ammonium nitrate solution, which belongs to the field of fertilizers. The method is characterized by comprising the following steps: (1) synthesis of ammonium nitrate, wherein liquid ammonia is gasified by a liquid ammonia evaporator and then reacts with a nitric acid solution in a first neutralizer for a neutralization reaction so as to produce ammonium nitrate; (2) gas-liquid separation, wherein resultant ammonium nitrate and residual ammonia gas in the reaction enter into a separation section of the first neutralizer for separation; (3) preparation of a urea solution; (4) production of the urea ammonium nitrate solution, wherein ammonium nitrate and urea are put in a second neutralizer for a reaction so as to produce the urea ammonium nitrate solution; (5) cooling and storage, wherein the resultant urea ammonium nitrate solution is cooled, discharged and stored; (6) washing and purification of tail gas; and (7) condensation and filtration of the tail gas. The method provided in the invention has the advantages of agile operation, simple flow, economical investment, low consumption, low production cost, convenient adjustment of load, capacity of fully adapting to market demands, reduced discharge, conservation of energy and environmental friendliness.

Description

technical field [0001] The invention belongs to the field of chemical fertilizers, in particular to a preparation method of urea ammonium nitrate solution. [0002] Background technique [0003] Fertilizer is one of the important means of agricultural production and plays an important role in economic development. It plays an important role in the sustainable and stable increase of agricultural production and the increase of gross national product. [0004] Fertilizers are mainly N, P, K and compound fertilizers, as well as trace element fertilizers, such as urea, ammonium sulfate, ammonium nitrate, ammonium chloride, superphosphate, calcium magnesium phosphate fertilizer, potassium dihydrogen phosphate and agricultural bicarbonate Ammonium supplements the macroelements and microelements needed for crop growth and increases the content of nutrients in the agricultural cycle. Among them, N fertilizer plays an important role, and it is a chemical fertilizer containing the cr...

Claims

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Application Information

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IPC IPC(8): C05C13/00
Inventor 邓敏许斌鄢家祥郭和刚
Owner CHINA CHENGDA ENG
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