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Method and apparatus for improving industrial producing urea

A technology of urea and urea equipment, which is applied in the field of industrial production of urea in the improvement of low-toxicity urea-formaldehyde resin glue, can solve the problems of expensive, laborious equipment, complex reactor structure, etc., and achieve low cost, small maintenance workload, and urea or The effect of cost reduction

Inactive Publication Date: 2004-12-15
黑龙江黑化集团有限公司
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Problems solved by technology

However, such an implementation is labor intensive and requires a lot of equipment
In addition, the structure of the reactor is complex and therefore expensive

Method used

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Effect test

Embodiment 1

[0048] The industrial production urea plant has a daily production capacity of 1,000 tons. The synthesis tower (built with 11 cross-flow high-efficiency trays) and the stripping tower are about 18 meters and 11 meters respectively. The diameter of the high-pressure ammonium carbamate (methyl ammonium) condenser is 3 meters. The liquid ammonia (3,240,000 kg) produced by the Ende pulverized coal gas furnace from the boundary area is pressurized by a high-pressure ammonia pump (16.2Mpa) and sent to the ammonia heater (not shown), and then sent to the ammonia heater (not shown) through a high-pressure injector. To the high-pressure methylammonium condenser. CO from the boundary area 2 (16000m 3 / h) After four-stage compression, secondary fine desulfurization, dehydrogenation and catalytic combustion to remove impurities, the CO 2 Medium H 2 S is 1mg / NM 3 , the hydrogen content is less than 50PPm, introduced to the bottom of the high-pressure stripping tower, as a stripping carr...

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Abstract

The present invention relates to improved industrial urea producing method and apparatus. The production process includes the reaction between ammonia and CO2 inside the synthesizing tower with efficient tower plates at the synthesis temperature and pressure, the reverse direction contact between the urea synthesizing solution with CO2 in the gas stripping column to separate unreacted ammonia and CO2, and the further treatment of urea synthesizing solution containing unreacted ammonia and CO2 to obtain urea. The urea product has the main technological indexes of biuret not more than 0.5 %, sulfate not more than 0.01 %, free ammonia not more than 0.015 %, water not more than 0.3 %, ammonia content 46.4 %, Fe not more than 0.005 % and granularity 1.0-2.4 mm, and is used as fertilizer widely and for production of low toxicity ureaformaldehyde resin, etc.

Description

technical field [0001] The invention provides a method for industrial production of urea, in particular to an improved industrial production method and equipment for urea with high production efficiency, high product purity, and low toxicity urea-formaldehyde resin. Background technique [0002] As everyone knows, the current method of industrial production of urea is that ammonia and carbon dioxide first generate ammonium carbamate (hereinafter referred to as methyl ammonium) by the following reaction at a suitable pressure such as 125-350 atmospheric pressure and high temperature such as 170-250 ° C: [0003] <chemistry num="001"> <chem file="200310113074_cml001.xml" / > < / chemistry> [0004] Then the generated ammonium carbamate generates urea by dehydration according to the following equilibrium reaction formula. [0005] <chemistry num="002"> <chem file="200310113074_cml002.xml" / > < / chemistry> [0006] According to the equilib...

Claims

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Application Information

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IPC IPC(8): C07C273/04
Inventor 岳守成韩士春潘卫森郑青吾柏安龙王宏伟王景林阎树忠
Owner 黑龙江黑化集团有限公司
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