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Method and apparatus for improving industrial producing urea

A urea device and urea technology, applied in chemical instruments and methods, preparation of urea derivatives, preparation of organic compounds, etc., can solve the problems of complex reactor structure, expensive, labor-intensive equipment, etc., and achieve low cost and maintenance work The effect of small amount, urea or cost reduction

Inactive Publication Date: 2006-03-01
黑龙江黑化集团有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

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

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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, and in particular relates to a method for improving an industrial production urea device with high production efficiency, high product purity and suitable for low-toxicity urea-formaldehyde resin glue. 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]...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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