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Urea synthetic method

A synthesis method, urea technology, applied in chemical instruments and methods, preparation of organic compounds, preparation of urea derivatives, etc., can solve problems such as large environmental impact, complicated method, low production capacity, etc., achieve low cost, uniform urea particles, The effect of less impurities

Inactive Publication Date: 2015-02-18
CHONGQING XUXING CHEM
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  • Abstract
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Problems solved by technology

[0003] At present, the urea synthesis process mainly has the following problems: complex method, high cost, low production capacity, and great impact on the environment

Method used

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  • Urea synthetic method

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Embodiment Construction

[0021] The principles and features of the present invention are described below in conjunction with the accompanying drawings, and the examples given are only used to explain the present invention, and are not intended to limit the scope of the present invention.

[0022] Such as figure 1 Shown, a kind of urea synthesis method comprises the steps:

[0023] The raw liquid ammonia is supplied by the synthetic ammonia workshop. After entering the urea workshop, it passes through the ammonia preheater and then enters the high-pressure ammonia pump; in order to avoid the gasification of the liquid ammonia, the temperature of the liquid ammonia must be controlled to be 5-12°C lower than the boiling point after the ammonia pump boosts the pressure. ; Feed gas CO 2 After being compressed by a carbon dioxide compressor, it is sent to the bottom of the synthesis tower and the stripping tower. The raw material liquid ammonia from the synthetic ammonia unit enters the urea synthesis tow...

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Abstract

The invention relates to a urea synthetic method which comprises the following steps: compression of raw material ammonia and carbon dioxide; synthesizing and gas stripping; medium and low pressure decomposition and recovery process; evaporation and pelletizing of urine. The method disclosed by the invention is simple, is low in cost and has a high synthesizing speed; obtained urea particles are uniform, have low impurity content, are moderate to dissolve and can be sufficiently adsorbed by crops more easily; moreover, an adsorption tower is utilized to treat tail gas, so that the synthesizing process is more environmental-friendly.

Description

technical field [0001] The invention relates to the technical field of chemical synthesis, in particular to a method for synthesizing urea. Background technique [0002] Urea, also known as carbamide, is a white crystal. One of the simplest organic compounds. Diamide of carbonic acid, molecular formula H 2 NCONH 2 (CO(NH 2 ) 2 ). Major nitrogen-containing end-product of protein metabolism breakdown in mammals and some fish. It is also the nitrogen fertilizer with the highest nitrogen content. As a neutral fertilizer, urea is suitable for a variety of soils and plants. It is easy to store, easy to use, and has little damage to the soil. It is a chemical nitrogen fertilizer that is currently used in large quantities. In industry, ammonia and carbon dioxide are used to synthesize urea under certain conditions. [0003] At present, the urea synthesis process mainly has the following problems: complex method, high cost, low production capacity, and great impact on the e...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C273/04
Inventor 周祖渝
Owner CHONGQING XUXING CHEM
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