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Method for producing cyanuric acid through vibrated fluidized bed

A technology of vibrating fluidized bed and cyanuric acid, which is applied in the direction of organic chemistry, can solve the problems of large investment, difficulty in expanding the production scale, and low yield, and achieve good economic benefits, various forms of heat energy, and high product yield. Effect

Inactive Publication Date: 2006-03-29
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Because this method has the characteristics of both rotary kiln and fixed kiln, the yield is greatly improved, and the labor intensity is between the two. However, this method is intermittent production, and the production scale is difficult to enlarge.
4 Other methods, in addition to the above-mentioned methods, there is also a molten metal heating method. In this method, urea is placed in a metal bath composed of a flowing tin-antimony alloy, and the urea is heated by the temperature of the liquid metal, and the production is realized through the flow of the metal. Continuous, it is reported that foreign countries have established large-scale industrial devices, and domestic manufacturers also conducted experiments in the 1980s, but they were abandoned due to excessive investment and high cost
Various methods have advantages and disadvantages, but the production process that can really meet the requirements of industrial production is the kiln method.
However, it has the disadvantages of high energy consumption, low yield, and high labor intensity.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0010] Mix cyanuric acid powder and urea in a ratio of 1.5:1 for rolling ball granulation. The operating temperature is 150°C, the operating time is 10 minutes, the rolling speed is 80 rpm, and the granulated spherical material is directly added without cooling. Vibrating fluidized bed, the fluidized bed is composed of four vibrating fluidized beds connected in series, reacting under the conditions of hot air temperature 300-320 ℃, vibration frequency 20Hz, amplitude 1mm, air velocity 0.2m / s, hot air adopts electric heating. The conversion of the material was 86%.

Embodiment 2

[0012] Mix cyanuric acid powder and urea in a ratio of 2:1 for rolling ball granulation. The operating temperature is 200°C, the operating time is 15 minutes, the rolling speed is 120 rpm, and the granulated spherical material is directly added without cooling. Vibrating fluidized bed, the fluidized bed is composed of four vibrating fluidized beds connected in series, reacting under the conditions of hot air temperature 280-300 ℃, vibration frequency 40Hz, amplitude 3mm, air velocity 0.5m / s, hot air adopts electric heating. The conversion rate of material was 90%.

Embodiment 3

[0014] Mix cyanuric acid powder and urea in a ratio of 1.8:1 for rolling ball granulation. The operating temperature is 160°C, the operating time is 17 minutes, the rolling speed is 100 rpm, and the granulated spherical material is directly added without cooling. Vibrating fluidized bed, the fluidized bed is composed of four vibrating fluidized beds connected in series, reacting under the conditions of hot air temperature 340-360 ℃, vibration frequency 10Hz, amplitude 2mm, air velocity 0.4m / s, hot air is directly introduced from Gas boiler flue gas. The conversion of the material was 92%.

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Abstract

Pyrolithic acid powder and urea ni ratio of 1.5-2:1 are mixed to proceed ball-rolling granulating, then are put in vibration fluid-bed to proceed hot-blast heating reaction to obtain pyrolithic acid, operation time is 10-20 minutes, processing temp. is 100-200 deg.C, rollnig speed is 50-120 r / m, hot-blast temp. in vibration fluid-bed is 280-360 deg.C, vibration frequency is 10-50 Hz, vibrating amplitude is 1-3 mm, gas speed is 0.1-0.5 m / s.

Description

technical field [0001] The invention relates to a method for producing cyanuric acid with a vibrating fluidized bed method. Background technique [0002] At present, the industrial production of cyanuric acid uses urea as a raw material. After high-temperature heating, the urea is cracked to generate isocyanuric acid, which is then polymerized into cyanuric acid. Because the reaction temperature can be completed between 180-340°C, and urea starts to melt at about 110°C, and serious wall sticking occurs. In order to solve this problem in production, various production methods have appeared in industrial production, which can be mainly divided into solid phase method and liquid phase method. These two methods have their own advantages and disadvantages, and are used in industry. The characteristics of the law are as follows: [0003] The solid-phase method is a production method in which urea is directly heated for thermal polymerization. According to the difference of heat...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07D251/60
Inventor 杜建卫陈蓝天董志新刘键
Owner PETROCHINA CO LTD