Method for reducing content of biuret in industrial urea and production device

• Main Authors: HAN LIANG, CHEN YITENG, GE CHAOWEI, LIU WEI, ZHOU TIANFEI, ZHANG JUN, LIU YONGGANG, ZHANG YONGQIANG
• Format: Patent
• Language: Chinese; English
• Published: 02.11.2021
• Subjects: ACYCLIC OR CARBOCYCLIC COMPOUNDS; CHEMISTRY; METALLURGY; ORGANIC CHEMISTRY; PERFORMING OPERATIONS; PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL; SEPARATION; TRANSPORTING

The invention discloses a method for reducing the content of biuret in industrial urea, and relates to the technical field of urea production. The method comprises the steps that 1) urea methylamine liquid enters a flash tank for decomposition; (2) a decomposed liquid-phase product flows out from the bottom of the flash tank, and is conveyed to an evaporation device for evaporation and concentration; and (3) the evaporated concentrated urine is sent to a granulator to be granulated, and urea particles are obtained, wherein the content of biuret in the urea product is reduced to 0.83%, and the requirement of an industrial fertilizer can be met. The invention also discloses a growth device of the method. According to the production device, an existing urea buffer tank is removed, the diameter of a granulation pipeline is reduced, and the retention time of urine in a system is shortened, so that the technical effect of reducing biuret in a urea finished product is achieved. 本发明公开了一种工业用尿素中缩二脲含量降低的方法，涉及尿素生产技术领域，包括