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Water solution all-circulation aquadrate high pressure system energy-saving and production-increasing process

An aqueous solution full circulation, high-pressure system technology, applied in the preparation of organic compounds, preparation of urea derivatives, chemical instruments and methods, etc., can solve problems such as difficult preheating, difficult to distribute evenly, crystallization blockage of carbamate in heat exchange tubes, etc. , to achieve the effect of improving the contact interface, increasing the production significantly, and improving the purity

Inactive Publication Date: 2003-12-31
CHINA HUANQIU CONTRACTING & ENG CO LTD
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AI Technical Summary

Problems solved by technology

According to the industrial pilot, due to the horizontal structure of the high-pressure methylammonium condenser, it is difficult to evenly distribute carbon dioxide gas and liquid ammonia into each U-shaped tube, and it is impossible to set up a methylammonium pre-reaction zone to increase the reaction material into the heat exchange tube as soon as possible. The temperature and the shell side steam condensate are difficult to preheat, which will easily lead to problems such as methylammonium crystallization and blockage in the heat exchange tube.

Method used

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  • Water solution all-circulation aquadrate high pressure system energy-saving and production-increasing process
  • Water solution all-circulation aquadrate high pressure system energy-saving and production-increasing process
  • Water solution all-circulation aquadrate high pressure system energy-saving and production-increasing process

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Embodiment 1

[0031] Carry out energy-saving and production-increasing reformation to an existing medium-sized aqueous solution full-circulation urea plant with the method of the present invention, take the production capacity increase from 500 tons / day to 750 tons / day as an example, estimate the total transformation cost (including the post-process of the original high-pressure system The transformation of eliminating bottlenecks, reducing ammonia consumption and eliminating pollution) is about 18 million yuan. After the transformation, the annual output value will increase by 82.5 million yuan (according to the urea price of 1100 yuan / ton); and the energy saving and consumption reduction, only considering the reduction of ammonia, steam and electricity consumption, the urea production cost can be reduced by 61 yuan / ton, and the total annual reduction can be reduced. The cost amounted to more than 13 million yuan. Only based on the production cost of energy saving and consumption reduction...

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Abstract

The present invention provides new technological process of producing urea in a completely circulating high pressure solution system. On the basis of available high pressure system, three pieces of high pressure apparatus including one urea synthesizing tower, one synthesizing tower separator and one gas stripping column are increased, the original urea synthesizing tower is altered into the second one, the first urea synthesizing tower is for feeding CO2 and ammonia only and the second urea synthesizing tower is for pressure lowering operation. The system of the present invention has one 30-100 % raised production capacity and greatly lowered power consumption.

Description

technical field [0001] The invention relates to a urea production method, in particular to a new process for energy-saving and production-increasing transformation of a high-pressure system of an aqueous solution full-circulation urea plant. Background technique [0002] At present, there are about 200 sets of small and medium-sized urea plants in China, most of which are Stamicarbon's aqueous solution full circulation process technology in the 1950s. Today, in the 21st century, this process technology has fallen far behind. This technology has problems such as high consumption, flammable and explosive tail gas, ammonia and urea pollution in the discharged waste liquid, etc., so it is urgent to carry out energy-saving and production-increasing transformation. [0003] Stamicarbon's aqueous solution full cycle urea production process, synthesis pressure 20MPa, synthesis temperature 188 ° C, synthesis feed NH 3 / CO 2 The ratio is 3.8~4.0, H 2 O / CO 2 The ratio is 0.65~0.7, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C273/04
Inventor 池树增王文善佟沛然谷庆合
Owner CHINA HUANQIU CONTRACTING & ENG CO LTD
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