Deep processing of synthetic ammonia and urea
Thread Content
Given the rising prices of natural gas, and the **strict restrictions on fertilizer prices. The homogeneity of products results in unfavorable profit prospects for fertilizer factories alike. What are the good approaches that various manufacturers have for the further processing of synthetic ammonia and urea? I hope everyone will discuss it.
Synthetic ammonia is used as a raw material for phosphorus-ammonia production; urea products were previously used in urea-formaldehyde adhesives, but only in small quantities (with no market demand), or as melamine
Melamine is produced by condensing urine containing urea, in a 3:1 ratio; its cost is more than three times that of urea. It seems that the production scale for it isn’t very large at present
It is 6:1; 6(NH2)2CO → C3N6H6 + 6NH3 + 3CO2 – Q. In China, all production of melamine currently relies on the urea method. The 12,000 kt/a melamine production facility owned by Sichuan Chemical Industry Group uses the DSM method from the Netherlands, and it is equipped with a urea synthesis unit as well. Shandong Haihua Co., Ltd. employs improved low-pressure production technology and has introduced some advanced foreign equipment to build production facilities with capacities of 0.6 thousand tons per year and 1.2 thousand tons per year. Manufacturers such as Zhongyuan Dahuahua, Fujian Sanming, and Sichuan Chemical have adopted high-pressure process equipment. Other production facilities (with a capacity of generally 0.1 to 0.6 ten thousand tons per year) employ low-pressure production technology developed domestically; the exhaust gases from these facilities are recycled to produce ammonium carbamate. Depending on the specific conditions of each manufacturing plant, ammonium carbonate or ammonium sulfate is produced, and in some cases, it is even exported as agricultural ammonia.