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High yield method for the synthesis of urea

A technology for synthesizing urea and a liquid mixture, applied in the field of urea synthesis, can solve problems such as unfavorable stripping step heat balance, increased energy consumption and the like

Active Publication Date: 2016-02-10
SAIPEM SPA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This solution effectively allows increased conversion in each channel in the reactor, reducing the amount of water present, but detrimental to the heat balance of the stripping step, which requires an additional amount of heat to evaporate the recirculated carbamate liquid flow
This can result in an increase in overall energy consumption and, in some cases, require changes to the equipment used for stripping

Method used

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  • High yield method for the synthesis of urea

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Embodiment Construction

[0068] exist figure 1 In , dashed lines indicate alternative possibilities for implementing the method of the invention, which are not mutually exclusive. In addition to valves V1 and V2 and injector E, other functional details such as pumps, valves, and other equipment that are not important for a full understanding of the method shown are given in figure 1 not shown in

[0069] In any case, the method according to the invention should not be considered as limited to the appended figure 1 shown and described in the description.

[0070] figure 1 The scheme shown in illustrates reactor R connected to stripper S via overflow T and line 5 . Line 7 sends the semi-purified mixture comprising urea from the bottom of stripping column S through heat exchanger F, and from said heat exchanger F to the separation and Purification part P. Via line 2 and line 8, and via exchanger F, the solution of recycled ammonium carbamate is sent from part P to stripper S, and possibly a part of...

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Abstract

A process for the direct synthesis of urea from ammonia and carbon dioxide at high pressures and temperatures, with the formation of ammonium carbamate as intermediate, comprising a decomposition step of the ammonium carbamate and stripping of the gases formed, operating substantially at the same pressure as the synthesis step, wherein the recycled liquid streams are fed, at least partially, to the same decomposition and stripping step after being preheated by heat exchange with a stream included in the high-pressure synthesis cycle.

Description

technical field [0001] The present invention relates to a high-yield, urea synthesis method. [0002] In particular, the present invention relates to a total recycle process for the direct synthesis of urea from ammonia and carbon dioxide at high temperature and pressure with improved heat flow and mass distribution to allow for higher conversion of the reagents and for the reaction of urea with Subsequent separation of the mixture and recycling of unconverted reagents is more efficient. Background technique [0003] All currently used industrial methods for the preparation of urea are based on a direct synthesis according to the following reaction: [0004] 2NH 3 +CO 2 →CO(NH 2 ) 2 +H 2 O(1) [0005] The reaction occurs in two separate reaction steps: [0006] 2NH 3 +CO 2 →(NH 4 )COONH 2 (1a) [0007] (NH 4 )COONH 2 →CO(NH 2 ) 2 +H 2 0(1b) [0008] In the first step, there is an exothermic equilibrium reaction that is kinetically favored to proceed at roo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C273/04B01J19/00
CPCC07C273/04B01J2219/00006B01J2219/00024C07C213/04Y10T29/49716
Inventor 莱诺·卡利西亚历山德罗·詹纳萨
Owner SAIPEM SPA