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Urea production method and urea production device

A manufacturing method and urea technology, applied in the field of urea manufacturing, can solve problems such as increased water vapor consumption, and achieve the effects of reducing water vapor consumption and improving urea conversion rate

Active Publication Date: 2020-07-10
TOYO ENG CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Reduction of CO2 entering the stripper, which will be accompanied by an increase in unreacted products due to a decrease in urea conversion, resulting in an increase in water vapor consumption in urea production

Method used

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  • Urea production method and urea production device
  • Urea production method and urea production device

Examples

Experimental program
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Effect test

Embodiment 1

[0062] use figure 1 The apparatus shown, carries out the synthesis of urea. The pressure of the synthesis system (reactor A, stripper B) is set to 160bar, the NH in the reactor A 3 Components and CO 2 The molar ratio (N / C) of the components was set to 3.7, H 2 O component CO 2 The molar ratio of the components was set at 0.58. In addition, H 2The O component removes the water produced during urea synthesis from the actually existing water, and the H 2 The molar amount of the O component is a value obtained by subtracting the urea molar amount from the water molar amount.

[0063] To reactor A, 10% by weight of carbon dioxide required as a raw material was introduced, and the entire amount of raw material ammonia was heated to a temperature of 140°C and introduced, and the operating temperature of reactor A was maintained at 182°C for reaction. The synthesis mixture obtained in reactor A is sent to stripping column B, and while being heated in 20 bar steam, stripping is ...

Embodiment 2

[0067] 80% by weight of the decomposed gas from the stripper B is sent to the shell side of the condenser D, and the remaining 20% ​​by weight is sent to the reactor A together with the condensate through the ejector 12a, except that it is the same as in the example 1 is implemented in the same way. As a result, the temperature of the reactor A rose by 4°C. Also, increasing the operating pressure to 165 bar, the temperature of reactor A increased by 8°C. As a result, the conversion of carbon dioxide to urea is increased by 2%, and the consumption of water vapor (20 bar) in the stripper B is reduced by 0.1 ton per ton of urea (approximately 15% by weight).

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Abstract

The invention provides a urea production method and a production device capable of increasing the urea conversion rate and reducing water vapor consumption. In the present invention, the entire amount of raw material ammonia is introduced into the reactor, and part of the decomposed gas obtained from the stripper is introduced into the reactor, thereby increasing the temperature of the reactor. The raw material ammonia is preferably heated by steam condensate generated in the refining step and / or water vapor generated by condensation heat in the condensation step, and its temperature is preferably 70 to 140°C.

Description

technical field [0001] The present invention relates to a method and a device for producing urea. More specifically, the present invention relates to a method and device for producing urea capable of increasing the conversion rate of urea and reducing water vapor consumption. Background technique [0002] Regarding the manufacture of urea, the following method is adopted: first, as shown in the following formula (1), ammonia (NH 3 ) and carbon dioxide (CO 2 ) react to produce ammonium carbamate (NH 2 COONH 4 ), and as shown in the following formula (2), urea (NH 2 CONH 2 ) and water (H 2 O). [0003] 2NH 3 +CO 2 →NH 2 COONH 4 (1) [0004] NH 2 COONH 4 →NH 2 CONH 2 +H 2 O (2) [0005] Although the above-mentioned reactions are all equilibrium reactions, the reaction of formula (1) is an exothermic reaction, and the reaction of formula (2) is an endothermic reaction. Therefore, various methods for improving the conversion of ammonia and carbon dioxide to ure...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C273/04C07C275/00
CPCC07C273/04C07C273/16Y02P20/141B01J12/02C07C275/00B01D3/009B01D5/0081B01D5/009B01J19/0053
Inventor 佐藤启史吉本宪司森川晴行
Owner TOYO ENG CORP