Patent ID: 8604239
Filing Date: 2013-12-10
Classification: C07C,C08J,C08L

Abstract:
1. A method of manufacturing diethylene tricarbamide comprising the steps of: mixing diethylenetriamine, urea, and at least one reaction medium comprised of one or more organic solvents to form a reaction mixture; reacting said reaction mixture by heating the reaction mixture, up to between about 105° C. and 180° C., or to the boiling point of the reaction mixture within the indicated temperature range, for a predetermined length of time, to generate an ammonia by-product and removing the ammonia by vaporization or by distillation with a part of the reaction mixture to form a first solution or slurry of diethylene tricarbamide in the organic solvents; cooling said first solution or slurry of diethylene tricarbamide in the organic solvents to complete the formation of precipitates as crude wet diethylene tricarbamide particles; collecting the crude wet diethylene tricarbamide particles by filtration; drying the crude wet diethylene tricarbamide particles resulting in dried diethylene tricarbamide; optionally purifying the crude wet diethylene tricarbamide particles by dispersing in water, in at least one organic solvent, or in a combination thereof, at a predetermined elevated temperature to form a second solution or slurry, a cooling said second solution or slurry to complete the formation of wet purified diethylene tricarbamide crystals, collecting the wet purified diethylene tricarbamide crystals by filtration, and drying the wet purified diethylene tricarbamide crystals resulting in dried diethylene tricarbamide.