To what extent can a deep hydrolysis unit reduce ammonia and urea?
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In many urea plants, deep desorption and hydrolysis systems are typically used; what is the minimum level to which these systems can reduce the ammonia and urea content in the process condensate?
Monsanto’s deep desorption can reach 5PPM
The urea deep hydrolysis recovery system can reduce the ammonia content in the residual liquid to 20 mg/kg and the urea content to 2 mg/kg. Last edited by Chemical Kid on 2008-1-23 08:59.]
Most hydrolysis processes can reduce the ammonia content in the condensed liquid resulting from the hydrolysis process to ≤5PPm； The urea content is reduced to ≤5PPm.
Urea can be reduced to 2mg/kg
I’m sorry, it was a mistake just now; the urea level can be reduced to 2 mg/kg, which is 2 PPM
The project I am working on involves urea at 3 ppm and ammonia at 5 ppm. －－My own design
Is there a manufacturer? Let’s check that out.
The project I am working on involves urea at 3 ppm and ammonia at 5 ppm. －－My own design-----------Where do the successful cases come from?
In use at our factory; available for inspection, and particularly suitable for the renovation of the raw solution circulation method.
Below 5PPmc. Our device is in use right now.
As far as I know, the design values are all below 5PPM, but some manufacturers still face difficulties in actually achieving these design specifications. (Vapor consumption)
As far as I know, it’s rare for the ammonia level to reach 5 ppm at present; there’s no problem with urea. The ammonia level I can achieve is around 10 ppm. The wastewater can be further treated to serve as feed water for the gas generation jacket.
Currently, the best technologies for the deep hydrolysis of urea are those developed by Monsanto in the United States and by Ningbo Far East in China; both claim to be able to reduce ammonia nitrogen levels to below 5 ppm. However, Monsanto’s technology is relatively expensive, with a transfer fee said to be as high as $200,000. Domestic technology is much cheaper.
It is said that Cassali, an expert in synthetic ammonia reactors, has used U-shaped plate internals in its hydrolyzers to improve the efficiency of gas stripping and hydrolysis, enabling the NH3 concentration in the output water to remain below 3 ppm; currently, 10 such hydrolyzers are in operation. The technology transfer fee is unknown; for specific details, you can inquire with their representative office in Shanghai
All companies claim that their technology can reduce urea levels to 3 ppm and ammonia levels to 5 ppm in wastewater, but in practice these levels are usually between 20 and 30 ppm
Isn’t it specified that both urea and ammonia should be reduced to below 3 ppm? In short, this is how our design is structured, and domestic suppliers also provide such guarantee values! No on-site experience; needs to be verified!
Last month, our company put into operation a 25-cubic-meter hydrolysis unit for which the hydrolysis technology was provided by Monsanto in the United States (now known as Monmoc), with domestic parties handling the design work. The unit is currently operating normally and requires little adjustment; however, it has not yet passed the acceptance inspection due to issues related to analysis and the recovery of methylammonium solution.
The medium-pressure hydrolysis technology and low-pressure stripping hydrolysis technology, independently developed by Ningbo Far East Chemical Group Co., Ltd., have been successfully deployed in over 30 units across China; the urea and ammonia contents in the waste liquids produced by these systems are both below 10PPM. The low-pressure stripping hydrolysis technology has also been successfully used in 4 units in China, with another 2 units under design. The low-pressure gas lift hydrolysis unit of Fujian Yong’an Zhisheng Chemical Co., Ltd. was contracted out in its entirety by our company under a turnkey project. The unit has been operating for over a year with excellent results: the ammonia level in the waste liquid is around 4 PPM, and urea is practically undetectable. Ningbo Far East Chemical Group Co., Ltd. has localized foreign technologies, reducing investments by 25%. For inquiries or to request information, please call 0574-87979373 or 13505742491.
Our company uses technology from Monsanto in the United States; the ammonia nitrogen level in the wastewater is 5 ppm, and that of urea is 5 ppm. But Monsanto’s technology transfer fee amounted to $250,000.