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Whole liquid phase isothermal urea synthesis method and its special equipment

A synthesis method and urea technology, which are applied in chemical instruments and methods, preparation of organic compounds, preparation of urea derivatives, etc., can solve the problems of low carbon dioxide conversion rate, easy corrosion of urea synthesis tower, high energy consumption, etc. The effect of liquid phase reaction area, increasing the utilization of effective space, and improving the reaction rate

Inactive Publication Date: 2007-10-03
张立强
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Problems solved by technology

It mainly solves the problems that the existing urea synthesis tower is easy to corro

Method used

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  • Whole liquid phase isothermal urea synthesis method and its special equipment

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Experimental program
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Effect test

Embodiment 1

[0014] Embodiment 1, referring to Fig. 1, 2, process and make tower body 1, offer liquid ammonia inlet 5, carbon dioxide inlet 6 and first liquid inlet 7 at the bottom of tower body 1, offer discharge port 8 at its top, in tower body 1. A liquid atomization reactor 2 is installed inside. The liquid atomization reactor 2 communicates with the liquid ammonia inlet 5, the carbon dioxide inlet 6 and the first liquid inlet 7, and then installs a high-efficiency tray 4 on the inner wall of the middle and upper part of the tower body 1. The high-efficiency tray 4 is multi-layer, and the heat exchange pipe 3 is installed on the high-efficiency tray 4. The heat exchange pipe 3 can be "U" type or "S" type. The heat exchange pipe 3 and the liquid atomization reactor 2 Communication; liquid atomization reactor 2, heat exchange pipe 3, and high-efficiency tray 4 are made of urea grade 316Lmod, TA2, and zirconium materials.

[0015] Then add liquid ammonia, carbon dioxide and a liquid to th...

Embodiment 2

[0016] Embodiment 2, the urea synthesis tower is the same as embodiment 1, the difference is that liquid ammonia, carbon dioxide and a liquid ammonia are added to the corresponding feed port in the tower, and the feed NH 3 / CO 2 Molecular number ratio 4.0, H 2 O / CO 2 Molecular number ratio is 1.0; liquid ammonia and first liquid react with carbon dioxide instantly and thoroughly after atomization in the liquid atomization reactor to generate ammonium carbamate solution, which first enters the heat exchange pipe and enters the urea synthesis from the other end of the heat exchange pipe At the bottom of the tower, the temperature inside the tower is 190°C and the pressure is 19MPa; the ammonium carbamate solution completes the dehydration reaction in the urea synthesis tower to generate urea, which is discharged from the discharge port, and the conversion rate of carbon dioxide is detected to be 75%.

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Abstract

This invention relates to a whole liquid phase isothermal type urea synthesis method and special equipment. It adds liquid ammonia, carbon dioxide imparlanceand an A liquid from corresponding feed head. Liquid ammonia and the A liquid atomized in liquid atomization reactor, then take reaction with carbon dioxide, generate carbamic acid ammonia solution, enter urea synthesis tower, complete dehydration reaction, generate urea, batching off from discharge port; the urea synthesis tower includes tower body(1), liquid ammonia intake(5) at tower body feet, carbon dioxide intake(6) and the A liquid intake(7), discharge port(8) at top, and set up liquid atomization reactor(2), highly active tower tray(4) in tower body interior. The liquid atomization reactor(2), liquid ammonia intake(5) , carbon dioxide intake(6) and the A liquid intake(7) are communicate with each other. Set up heat exchange tube (3) on highly active tower tray, and communicate with liquid atomization reactor (2). It is a whole liquid phase isothermal type urea synthesis method, conversion rate of carbon dioxide is high, dissipation of energy is small, high efficiency, and urea synthesis tower is incorruptible.

Description

Technical field: [0001] The invention relates to the technical field of urea production, in particular to a whole liquid isothermal urea synthesis method and special equipment thereof. Background technique: [0002] The urea synthesis tower is the key equipment for the production of urea. Because it is used under the operating conditions of high temperature, high pressure and strong corrosive medium, it is easy to cause lining corrosion and seal leakage, resulting in shutdown, production reduction and large maintenance costs; currently commonly used urea synthesis Most of the towers adopt the aqueous solution full-circulation process technology, and the conversion rate of carbon dioxide is only 60%-64%. In liquid A, but the conversion rate of carbon dioxide can not reach more than 70%, so the efficiency is low and the energy consumption is large. Invention content: [0003] The purpose of the present invention is to overcome the above-mentioned deficiencies in the prior a...

Claims

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Application Information

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IPC IPC(8): C07C273/04
CPCY02P20/141
Inventor 张立强侯守建
Owner 张立强
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