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Equipment of preparing birueal by using carbamide as raw material

A technology of biuret and equipment, which is applied in the field of preparing biuret, can solve problems such as uneconomical, expensive biuret, and unsuitable for environmental requirements, and achieve the effect of increasing the reaction rate

Inactive Publication Date: 2007-11-14
DONGJIN SEMICHEM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0020] However, since biuret used as a starting material is very expensive or it contains various impurities, and additional ammonia is required to synthesize biuret by reacting biuret with ammonia, the above-mentioned preparation using biuret as a starting material The problem with the biurea method is that it is uneconomical and environmentally unsuitable

Method used

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  • Equipment of preparing birueal by using carbamide as raw material
  • Equipment of preparing birueal by using carbamide as raw material
  • Equipment of preparing birueal by using carbamide as raw material

Examples

Experimental program
Comparison scheme
Effect test

preparation example 1～4

[0090] [Preparation Examples 1-4: Preparation of Biuret]

[0091] To a four necked round bottom flask was added 500 g (8.33 moles) of urea, stirred vigorously, and air was injected into the bottom of the flask at the rate shown in Table 1 below. The reaction was performed while maintaining the reaction temperature at 140° C. by heating for 5 hours. After the reaction was completed, the obtained solid content was analyzed by using liquid chromatography, and the results are shown in Table 1 below.

[0092] [Table 1]

[0093]

preparation example 5～7

[0094] [Preparation Examples 5-7: Preparation of Biuret]

[0095] Biuret was prepared in the same manner as in Preparation Example 1 except that the reaction temperature was changed and the air injection rate was kept at 2 L / min to allow the reaction to proceed for 3 hours. After the reaction was completed, the obtained solid content was analyzed by using liquid chromatography, and the results are shown in Table 2 below.

[0096] [Table 2]

[0097]

preparation example 8～10

[0098] [Preparation Examples 8-10: Preparation of Biuret]

[0099] Biuret was prepared in the same manner as in Preparation Example 1 except that the pressure was reduced to the pressure value shown in Table 3 below by using a vacuum pump instead of air injection. After the reaction was completed, the obtained solid content was analyzed by using liquid chromatography, and the results are shown in Table 3 below.

[0100] [table 3]

[0101]

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PUM

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Abstract

An apparatus for preparing biurea from urea is composed of a thermodecomposing furnace for thermo decomposing urea to obtain biuret and ammonia, a recrystallizing reactor for purifying the biuret, the first reactor for the reaction between biuret and metallic halate compound or halogen and alkali to obtain the metallic salt of halobiuret, the second reactor for the reaction between the metallic salt of halobiuret and ammonic to obtain biurea, and an ammonia evaporator for separating excessive ammonia and delivering it to ammonia concentrating unit.

Description

field of invention [0001] The present invention relates to a method and a plant for the preparation of biurets using urea as a starting material, in particular to a process and a plant for the economically and environmentally desirable preparation of biurets by preparing biurets from urea and making the obtained It is realized by the reaction of biuret and ammonia obtained during the synthesis of biuret. Background of the invention [0002] Biurea (HDCA) is a useful compound as a raw material for the preparation of azodicarbonamide, which is widely used as a blowing agent. As shown in Reaction Scheme 1 below, azodicarbonamide (2) can be obtained by oxidizing biurea (1) with a suitable oxidizing agent. [0003] [Reaction 1] [0004] [0005] Conventional methods for the preparation of biurea include the following: (i) using hydrazine as a starting material, (ii) synthesis directly from urea, (iii) preparing semicarbazide from urea, and then converting the resulting semic...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C275/02C07C273/12
Inventor 李晙赫韩尚镇
Owner DONGJIN SEMICHEM CO LTD