FIELD: modification of technology of production of carbamide from ammonia and carbon dioxide. SUBSTANCE: plant includes two synthesis reactors and desorption equipment where carbamate is subjected to partial decomposition in reaction mixture fed from synthesis zones of first and second reactors, as well as to partial separation of vapors of free ammonia in mixture of water vapor and admixtures. After partial condensation of vapors, first carbamate solution is obtained which is returned to first synthesis reactor. Second synthesis reactor is placed before desorption equipment and is connected with this equipment. Second carbamate solution obtained in separation section for recovery of carbanide is returned to second reactor. Thus, plant includes additional equipment for recirculation of second carbamate solution obtained at carbamide separation stage to second synthesis reactor, as well as equipment for return of ammonia flow and carbon dioxide in vapor phase to second reactor. EFFECT: facilitated procedure at increased production of end product. 26 cl, 8 dwg
Authors
Dates
2001-04-10—Published
1995-12-21—Filed