Commercial Urea Crystallization

Within the last 3 yr. there has been a very rapid increase in the usage of urea as a high grade fertilizer, animal feed supplement, and raw material for certain resins. The low-cost production of urea in large quantities has been widely studied by chemical engineers, and a number of processes have been developed, both in this country and abroad, which reflect considerable sophistication in engineering technology and in the use of specialized alloys to meet the corrosion problems encountered in the reactions required to produce urea.