Dicyandiamide content in urea
Thread Content
The urea produced by that company has a biuret content of less than or equal to 0.5, which means it meets the standards for high-quality industrial products. I heard that urea produced from natural gas has a low biuret content – is this true?
The biuret content in urea is less than or equal to 0.5% – is it possible to achieve that?
Whether it’s natural gas or gas produced from coal, isn’t urea also made from ammonia and carbon dioxide as raw materials? It shouldn’t be a problem with the raw materials; 0.7 is already the limit for our factory
Our plant uses natural gas, and the level of cyanuric dihydrate has never been below 0.8
It has nothing to do with coal gas. Granulation is carried out in a granulation tower, and the content of biuret in the product is generally 0.9%. Of this, approximately 0.40% is generated in the high-pressure section, about 0.05% occurs within the distillation tower, around 0.20% is produced in the evaporation section, and the remainder is generated in the overhead pipeline. The longer the pipeline to the tower, the higher the biuret concentration.
Conventional granulation techniques certainly cannot achieve this. The Dutch company Stamicarbon has a special process that can achieve this.
In the modified Japanese C method, the dicyandiamide level can be reduced to 0.3, but this process is no longer used in China.