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Purification method of biuret

A purification method, biuret technology, which is applied in the field of purification of non-protein nitrides, can solve the problems of restricted use, and achieve the effects of less three waste discharge, high safety performance, and high conversion rate

Active Publication Date: 2010-06-16
安徽泰格生物技术股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] At present, in the production of feed grade biuret, the obtained product contains a certain amount of impurities such as melamine, which limits its use in animals

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Measure 500ml of 95% ethanol, pour it into a 1000ml beaker, and when the temperature rises to 60°C, slowly add 130g of crude biuret with a content of 75%, stir and dissolve for 3 hours, and keep the temperature at 60°C, so that It is fully dissolved, decolorized and filtered through the activated carbon layer of the 722 injection, the filter cake is recovered as a biuret raw material, the filtrate is uniformly cooled (15 °C per hour) to 4 °C, stirred and crystallized for 3.5 hours, filtered, and the filtrate is concentrated and recovered as the next time The use of the crude dissolved biuret; the solid was vacuum-dried at 95° C. to obtain 86.2 g of biuret with a content of 99.7%.

Embodiment 2

[0029] Take 1000ml of recovered ethanol solution, pour it into a 2000ml beaker, and heat to 50°C. Slowly add 350g of crude biuret with a content of 56.8%, keep the temperature at 50°C, stir for 5 hours, and keep the temperature at 50°C to make it fully dissolve, pass through the 722-type injection with activated carbon layer for decolorization and filtration, and use the filter cake as the The raw material of diurea was recovered, and the filtrate was uniformly cooled (10° C. per hour) to 0° C., stirred and crystallized for 3.5 hours. After filtration, the filtrate was concentrated and recovered, and used as the next crude dissolved biuret; the solid was vacuum-dried at 95° C. to obtain 192 g of biuret with a content of 99.5%.

Embodiment 3

[0031] Measure 3000ml of 95% ethanol, pour it into a 5000ml beaker, and when the temperature rises to 70°C, slowly add 765g of crude biuret with a content of 83.2%, stir and dissolve for 6 hours, and keep the temperature at 70°C, so that It is fully dissolved, decolorized and filtered through the activated carbon layer of the 767 injection, and the filter cake is recovered as a biuret raw material, and the filtrate is uniformly (20°C per hour) cooled to 0°C, stirred and crystallized for 4 hours, filtered, and the filtrate is used as the next dissolution biuret The solvent for the crude urea product, and the solid was vacuum-dried at 70° C. to obtain 578 g of biuret with a content of 99.6%.

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PUM

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Abstract

The invention provides a purification method of biuret used as non-protein nitrogen feed additive and the method adopts the recrystallization technology. The method comprises the following steps: adding crude biuret in alcohol solvent at 50-70 DEG C, stirring for 2-6 hours to dissolve biuret; then filtering with an activated carbon layer; reducing the temperature of filtrate to 4-0 DEG C for crystallization, filtering, drying to obtain a biuret pure product with a content of 99.5% and concentrating solvent for recycling, wherein alcohol solvent is reused and the solid material is used as partial starting raw material for synthesizing biuret. The purification method of the invention has the advantages of high yield, simple operation, low cost and no three wastes and is suitable for industrialized application.

Description

technical field [0001] The invention relates to a method for purifying non-protein nitrogen compounds, in particular to a method for purifying crude biuret as a feed grade non-protein nitrogen feed additive biuret. Background technique [0002] Biuret is a safe and efficient non-protein nitrogen feed additive for ruminants. This product can be converted into bacterial protein that can be directly used by animals through the microbial system in the rumen of ruminants to meet the needs of animals for protein nutrition. , due to its low solubility, slow release of ammonia, and good slow release performance, it is difficult for animals to suffer from ammonia poisoning caused by excessive ammonia concentration in the rumen. Therefore, compared with non-protein nitrogen raw materials such as urea, It has higher safety performance and is an excellent animal feed additive. It has been widely used abroad. The Ministry of Agriculture of China also formulated the industry standard NY / T...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C275/62C07C273/18
Inventor 许火保王丽
Owner 安徽泰格生物技术股份有限公司
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