SU1088779A1 - Reactor for synthesis of carbamide - Google Patents

Abstract

1, UREA SYNTHESIS REACTOR, comprising a vertical cylindrical body, a lining of corrosion-resistant material placed on the inner surface of the case, a mixing device, reagent inlet and outlet connections, and horizontal partitions with openings located in the reaction zone, free section of which reduced in height of the reactor, characterized in that, in order to increase the reliability of operation, the distance between the partition and the reactor shell is 0.02-0.03 free Corps-section and the apertures in the baffles are arranged within a circle with a diameter of 0,8-0,9 D, where D - inner diameter of the housing. (L eo eo h VI Yu

Description

2. Reactor by ri. 1, dt and dt and, so that the free section of the partition is determined by the ratio | o

 ((2-з) Уи7и; г.

where C is the free section of the partition at the bottom of the partition;

 height of the partition; L is the total height of the reactor.

3. Reactor on PP. 1 and 2, of t l ich .1 y i and i with the fact that the free section of partitions located in the upper part of the reactor, where their free section is less than 0.06 is distributed within the ring, bounded by circles, the diameters of which

fV-2 m5

is 0.8-0.9

i.

one

The invention relates to apparatus for carrying out chemical processes and can be used in the industrial production of urea.

A urea synthesis reactor is known, which includes a housing, feed inlets for feedstock input and reagents withdrawal, contact-distributing devices, the latter being arranged with decreasing pitch in the direction I /, the hole flow of a constant free cross section of the contact-distributing partition, which is partially retained through the openings in the partitions, which reduces the intensity of the process of the synthesis of urinine, as well as the lack of means to prevent corrosion of the lining at the locations of the partitions .

The closest to the proposed technical essence and the achieved result is a urea synthesis reactor containing a vertical cylindrical body, internally lined with a corrosion-resistant material, a lining of corrosion-resistant material placed on the inner surface of the body, a mixing device, as well as located in the reaction zone on P | distance from the hull horizontal partitions with openings the free cross section of which decreases along the height of the reactor. 2.

The design of this reactor does not take into account changes in the hydrodynamics of a two-phase flow while reducing the gas content of the reaction mixture in the course of its movement through the apparatus.

To maintain the liner, made of stainless steel, in a passive state (and prevent its corrosion) are metered into the reactor.

small amount of oxygen (or air). In the annular mode of motion, not only does the efficiency of the synthesis process decrease, but also in the gap between the partitions and

Oxygen deficiency may occur in the hull, leading to increased corrosion.

In such a device, the size of the gap between the partitions and the wall of the case is not regulated. Between

if this gap is large, longitudinal mixing of the reaction mixture will occur in the near-wall zone, which significantly reduces the efficiency

reactor operation. If this gap is small, then there is a gap of corrosion. In this case, the corrosion process is especially intensive in the gap between the partitions v; wall in

zone where the volume fraction of gas is less than 50%.

The purpose of the invention is to increase reliability in operation by minimizing the possibilities of the longitudinal

mixing the reaction mixture and preventing corrosion damage to the lining of the apparatus.

The goal is achieved by the fact that in the urea synthesis reactor, containing a vertical cylindrical body, placed on the inner surface of the body lining of corrosion-resistant material, mixing device, fittings input and output of reagents, as well as

Claims (3)

1. UREA SYNTHESIS REACTOR, containing a vertical cylindrical body, a lining of corrosion-resistant material- + * ala placed on the inner surface of the body, a mixing device, reagent inlet and outlet fittings, and horizontal partitions with openings located in the reaction zone at a distance from the body, · Their cross section decreases in height of the reactor, characterized in that, in order to increase the reliability in operation. the distance between the partition and the reactor vessel is 0.02-0.03 from the free section of the vessel, and the holes in the partitions are located within a circle with a diameter of 0.8-0.9 D, where D is the internal diameter of the vessel. 6ΖΖ880Γ “TIG ¹⁶ piikmimHIHIllHHi · J. I.iktiim-im— | ΚΙΙΙΙΙΙΙΙ »ΙΗΗΙ · | S ^: W J '"5 Qut.f i 2. The reactor according to π. 1, with the fact that the free cross-section of the septum is determined by the relation h- - Ψ _Η - (Ψ _Η - (2-3). where is the free section of the partition in the lower part of the partition; L _n - the height of the partition; L is the total height of the reactor. 3. The reactor according to paragraphs. 1 and 2, of _t w w lich and I th with the fact that the free cross section of baffles located in the upper part of the reactor, where they are free area less than 0.06 is distributed within the annulus bounded by circles with diameters of 0,8-0 , 9 D and