Production process of high-nitrogen large-grain urea

A kind of large particle urea, production technology technology

Inactive Publication Date: 2006-10-11
北京荷丰远东技术有限公司 +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In addition, the tail gas still contains a large amount of free ammonia, which pollutes the environment

Method used

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  • Production process of high-nitrogen large-grain urea
  • Production process of high-nitrogen large-grain urea
  • Production process of high-nitrogen large-grain urea

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Experimental program
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Embodiment Construction

[0041] Refer below figure 1 Describe the content of the present invention in detail.

[0042] The raw material is urea solution with a concentration of 98% (wt) obtained from the urea synthesis and decomposition process, which is metered by the pipeline 1 and the flow meter 2 and then enters the mixing tank 3 .

[0043] In addition, the glyoxal solution is sent into the mixing tank through the glyoxal solution tank 6 and the glyoxal metering pump 7 . Mixing was carried out under conditions of a pressure of 0.15 MPa and a temperature of 132°C. After the above two materials are evenly stirred in the mixing tank, they are sent to the granulator 10 by the urea solution feeding pump 19 for granulation. The weight ratios of the urea solution and the glyoxal solution in the mixing tank are 100 kg and 0.1 kg respectively.

[0044] The granulation system consists of an atomizing fluidized bed granulator, a fluidizing air fan 12, an atomizing air fan 13, and an atomizing nozzle 11. ...

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Abstract

The invention discloses a production process of high-nitrogen urea large particles (2-8 mm in particle diameter). When producing high-nitrogen large particles, mix 90%-99% urea solution and glyoxal solution in a weight ratio of 100:0.05-0.25, and then granulate through atomized fluidized bed granulation process, after cooling Produce large granular urea. The urea dust-containing air discharged from the granulator and the final product cooler is sprayed and washed with water at normal temperature and pressure. The nitrogen content of the high-nitrogen large-grained urea obtained by the present invention can be as high as 46.4%, reaching the national standard GB2440-2001 for high-grade products; and the particles are large, uniform, high in strength, good in fluidity, not easily broken and not agglomerated, and convenient for storage and application.

Description

technical field [0001] The invention relates to a urea production process, in particular to a high-nitrogen large-grain urea production process using glyoxal as an additive. Background technique [0002] Currently, ammonia and CO 2 The solid urea produced by synthesis is the most important kind of nitrogen fertilizer, which is widely used in agricultural production as fertilizer. [0003] The process methods for producing large granular urea mainly include: Hydro (HYDRO) and Toyo Engineering Corporation (TEC) fluidized bed granulation process. The former is an atomized fluidized bed, and the latter is a jet fluidized bed. During the granulation process, a small amount of additive formaldehyde solution or urea-formaldehyde compound produced by the reaction of formaldehyde and urea solution is added. [0004] The production process of large granular urea in Hydro company see figure 2 : The urea solution with a raw material concentration of 95% (wt) is sent to the granulator...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C05C9/00C05G5/00
Inventor 王威徐耀武
Owner 北京荷丰远东技术有限公司
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