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Reactor for effecting gas-liquid biphasic reactions

A phase reaction, vertical reactor technology, applied in the field of reactors, can solve problems such as difficult access to internal parts inspection, high pressure drop, difficulty in reactor assembly and transportation, etc.

Active Publication Date: 2013-01-09
SAIPEM SPA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In order to obtain these contact times with high volumes of reaction mixtures, the height of the reactor as well as the number of plates must be increased, with the disadvantage of having to use too tall reactors, which are difficult to assemble and transport, and difficult to Close to internal components for possible inspections, also high pressure drop during operation
[0009] A proposed solution is to use two or more reactors per process line, however this has the disadvantage of increasing the cost of construction, operation and plant maintenance
On the other hand, it is disadvantageous to increase the volume of the reactor by widening the diameter of the column, as this will lead to a significant decrease in the conversion efficiency into urea due to back mixing and diffusion of the reaction mixture

Method used

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  • Reactor for effecting gas-liquid biphasic reactions
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Examples

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Embodiment Construction

[0054] in figure 1 A vertical column reactor can be identified in this column. The vertical column reactor is defined by a force body 4, and the two ends are respectively closed by a lower cover 8 and an upper cover 9. In the lower cover is inserted carbon dioxide and liquid ammonia and At the inlets 2, 3 of the flow of amine carbamate, the reaction mixture is collected in the upper cover, and the reaction mixture contains the urea formed in the reactor and is conveyed toward the discharger through the line 1 leaving the head. Alternatively, depending on the situation, the pipeline 1 may also leave the reactor at the middle height of the reactor, and be connected to a pipe arranged vertically inside the device until it reaches the upper cover of the reactor. An overflow used to collect liquid phase or gas-liquid mixture.

[0055] A plurality of perforated plates 7 defines a corresponding number of sectors 5 along the column, and the two-phase reaction mixture flows in these secto...

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Abstract

Vertical reactor for effecting gas-liquid biphasic reactions, comprising a plurality of perforated plates, superimposed and suitably spaced between each other along the vertical axis, wherein a dividing septum is positioned vertically in the sectors delimited by said plates. Said reactor is particularly used for effecting direct synthesis reaction of urea starting from ammonia and carbon dioxide.

Description

Technical field [0001] The invention relates to a reactor for carrying out a gas-liquid two-phase chemical reaction. [0002] More specifically, the present invention relates to a plate-type reactor, which is suitable for performing reactions in an environment including co-current (co-current) flow and mutually contacting liquid and gas phases, especially A direct synthesis reaction of urea starting from ammonia and carbon dioxide and having an intermediate formation of amine carbamate under high pressure and high temperature. Background technique [0003] The integrated process operations of gas-liquid two-phase fluids mixed with each other-such as chemical reactions, evaporation, separation, etc.-are usually carried out in a column-type device that includes a hollow cylindrical body. The cylindrical body is able to withstand high operating temperatures and pressures (if required) and is closed at both ends with hemispherical caps that are appropriately shaped and equipped with t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J10/00B01J19/00C07C273/04B01J19/02B01J19/24
CPCB01D3/141C07C273/04B01J2219/185B01J2219/0281B01J19/02B01J2219/00768B01J2219/1943B01J2219/00777B01J10/00B01J2219/0236B01J19/006B01D3/009B01J19/24Y02P20/10Y02P20/141
Inventor L·卡尔雷西A·贾纳扎
Owner SAIPEM SPA