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Method for reducing content of ammonia nitrogen in urea process condensate

A technology of ammonia nitrogen content and condensate, which is applied in chemical instruments and methods, water/sewage multi-stage treatment, degassed water/sewage treatment, etc. The effect of system water balance optimization and smooth operation

Inactive Publication Date: 2014-01-08
CHINA NAT OFFSHORE OIL CORP +2
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Problems solved by technology

On the one hand, in order to meet the quality requirements of urea hydrolysis, it is necessary to increase the amount of high-pressure steam; on the other hand, in order to meet the requirement that the ammonia content in the water quality is less than 3ppm, the lower tower of the desorption tower needs to increase the amount of low-pressure steam. increase

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  • Method for reducing content of ammonia nitrogen in urea process condensate
  • Method for reducing content of ammonia nitrogen in urea process condensate
  • Method for reducing content of ammonia nitrogen in urea process condensate

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Embodiment 1

[0028] Embodiment 1, use the method of the present invention to process urea process condensate

[0029] The process flow chart of present embodiment processing is as figure 1 shown.

[0030] (1) The above-mentioned urea process condensate is sent to the horizontal hydrolyzer after the first-stage desorption pretreatment on the upper part of the upper tower of the desorption tower, where it is completed by injecting high-pressure steam (4.3Mpa, 387°C) Urea hydrolysis reaction, wherein the operating pressure of the hydrolyzer is controlled to be 3.43Mpa, the temperature is 232°C, and the residence time in the hydrolyzer is 30 minutes.

[0031] (2) The liquid phase in the hydrolyzer enters two series-connected equilibrium stills for equilibrium distillation, and the pressures of the equilibrium distillation are 0.64Mpa and 0.52Mpa respectively. The gas phase generated during the equilibrium distillation process is reinjected into the upper section of the upper column of the de...

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Abstract

The invention discloses a method for reducing the content of ammonia nitrogen in urea process condensate. The method comprises the following steps: (1) introducing urea process condensate into a hydrolyzer for urea hydrolysis; (2) allowing a liquid phase obtained after urea hydrolysis to enter into an equilibrium distillation device through an outlet pipe of the hydrolyzer for equilibrium distillation; and (3) allowing a gas phase produced after equilibrium distillation to enter into an upper tower of a desorber or to be mixed with a gas phase product at the tower top of the desorber, allowing a liquid phase produced after equilibrium distillation to enter into the top of a lower tower of the desorber and carrying out gas stripping on the liquid phase so as to reduce the content of ammonia nitrogen in the urea process condensate. With the method provided by the invention, the concentration of ammonia nitrogen in a feed at a lower segment of the desorber can be regulated and controlled, the usage amount of low pressure steam LPS at tower bottom of the desorber and high pressure steam HPS in the hydrolyzer can be reduced, and thus, the usage amount of steam is reduced in two ways, the concentration of ammonia in water at tower bottom is stabilized, and water yield at the tower bottom is reduced.

Description

technical field [0001] The invention relates to a method for reducing ammonia nitrogen content in urea process condensate, and belongs to the technical field of waste water recovery and utilization in the urea process. Background technique [0002] The urea process condensate containing ammonia, carbon dioxide and urea produced in the urea production process must be treated to meet environmental protection requirements and effective use of resources. At present, for the purification of urea process condensate, urea production enterprises at home and abroad generally adopt the method of combining hydrolysis and desorption, and research and develop a variety of different urea process condensate treatment processes, among which the urea hydrolysis-desorption technology of Snamprogetti Company is the industry It is a relatively mature process in production and application, and it is the most widely used process in China. The process includes three consecutive treatment stages, ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/10C02F1/20
Inventor 周林峰吕纯泰黄长顺赵天宝黄庆祥王俊齐振曹睿
Owner CHINA NAT OFFSHORE OIL CORP
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