Process and device for producing strong ammonia water through negative pressure operation

• Main Authors: WANG SONGLIN, YU HAILU, LIU JING, ZHANG SULI
• Format: Patent
• Language: Chinese; English
• Published: 17.05.2017
• Subjects: AMMONIA; CHEMISTRY; COMPOUNDS THEREOF; CYANOGEN; INORGANIC CHEMISTRY; METALLURGY

The invention discloses a process and a device for producing strong ammonia water through negative pressure operation, and belongs to a coking chemical product recovery technology. Ammonia steam from an ammonia steaming tower dephlegmator is cooled by a condenser to be partially condensed, condensed liquid is discharged to the bottom of an ammonia recovering tower through the gravity action, and the non-condensed ammonia steam and noncondensable gas are pumped by a dry vacuum pump to generate negative pressure; the gas phase pumped through the dry vacuum pump is heated and pressurized to enter the ammonia recovering tower, ammonia removal is conducted by circulating ammonia water cooled externally, and the recovery rate of the ammonia is 90 to 95 percent; the noncondensable gas at the top of the ammonia recovering tower and containing a small amount of ammonia is directly discharged into a gas pipeline in front of an ammonia absorbing device or an ammonia process oxidation desulfurization device, and a strong