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Urea manufacturing method

A manufacturing method and technology of urea, applied in the field of urea manufacturing, capable of solving problems such as processing

Active Publication Date: 2021-01-05
TOYO ENG CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the recovered urea aqueous solution in line 10 contains a large amount of water, so it cannot be directly processed in the granulation process B

Method used

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  • Urea manufacturing method
  • Urea manufacturing method
  • Urea manufacturing method

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Embodiment

[0046] Then, for figure 1 For the implementation of the method, a specific study was carried out with reference to the material balance in each line. Here, assuming a urea plant equipped with a fluidized and spouted bed type urea granulation device with a production capacity of 3,500 tons / day of solid urea, the calculation is based on figure 1 (Example), image 3 The flow of (Comparative Example) is an approximate value of the material balance of each line. figure 1 In the calculation in the embodiment, the concentrated urea solution of line 13 was not taken out. in addition, image 3 In the comparative example, the additive was added from line 5. First, the example ( figure 1 ) The material balance of each line in ) is shown in Table 1, the comparative example ( image 3 ) The material balance of each line in ) is shown in Table 2.

[0047] [Table 1]

[0048]

[0049] (2)...Line 2 after converging with Line 11

[0050] (10)...line 10 after additive addition (line...

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Abstract

The present invention is a urea production method, including: a first concentration step of concentrating an aqueous urea solution; a granulation step of producing solid urea from the concentrated urea solution generated in the first concentration step; a urea recovery step of treating exhaust gas from the granulation step and recovering urea dust in the exhaust gas to generate a recovered aqueous urea solution, the granulation step being configured so as to treat a concentrated urea solution containing an additive; and a second concentration step of concentrating the recovered aqueous urea solution as an additional concentration step, wherein the concentrated recovered urea solution generated in the second concentration step is joined to the concentrated urea solution in the downstream of the first concentration step, and an additive is added downstream of the first concentration step.

Description

technical field [0001] The present invention relates to a method for producing urea. Specifically, it relates to a urea production method including a step of producing solid urea by adding additives to a synthesized aqueous urea solution. The present invention is a method for alleviating possible adverse effects of adding additives in a urea production process. Background technique [0002] Solid urea is one of the main products of the urea plant where urea is synthesized. The production process of solid urea is generally a process set downstream of the urea synthesis process in a urea plant. image 3 It is a figure explaining the manufacturing process of solid urea. image 3 In this method, the aqueous urea solution sent from the urea synthesis process through the line 1 is first supplied to the concentration process A, and the moisture in the aqueous urea solution is removed to form a concentrated urea solution. Then, the concentrated urea solution is supplied through th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C273/14C07C275/00
CPCB01J2/16C07C273/14C07C273/16B01J2/00B01J2/30
Inventor 中村周平佐佐木启伍
Owner TOYO ENG CORP
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