PROCESS FOR SCRUBBING AMMONIA FROM ACID GASES COMPRISING AMMONIA AND HYDROGEN SULFIDE

• Main Authors: DAVIS, MONROE, TEKIE, ZERU, BERHANE, FLOWERS, ROBERT, JOSEPH, BLACKWELL, BENNY, E, GRISE, STEVEN, LAMAR, ELY, WAYNE, B, CHU, LUIS, ALBERTO
• Format: Patent
• Language: English; French; German
• Published: 15.04.2009
• Subjects: ADDING MATERIALS TO FUELS OR FIRES TO REDUCE SMOKE ORUNDESIRABLE DEPOSITS OR TO FACILITATE SOOT REMOVAL; AMMONIA; CHEMISTRY; COMPOUNDS THEREOF; CYANOGEN; FIRELIGHTERS; FUELS; FUELS NOT OTHERWISE PROVIDED FOR; INORGANIC CHEMISTRY; LIQUEFIED PETROLEUM GAS; LUBRICANTS; METALLURGY; NATURAL GAS; PEAT; PERFORMING OPERATIONS; PETROLEUM, GAS OR COKE INDUSTRIES; PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL; PURIFYING OR MODIFYING THE CHEMICAL COMPOSITION OF COMBUSTIBLEGASES CONTAINING CARBON MONOXIDE; SEPARATION; SYNTHETIC NATURAL GAS OBTAINED BY PROCESSES NOT COVERED BYSUBCLASSES C10G, C10K; TECHNICAL GASES CONTAINING CARBON MONOXIDE; TRANSPORTING

The present invention provides a process for removing ammonia as an aqueous salt solution from an acid gas comprising ammonia and hydrogen sulfide. A strong acid, such as sulfuric acid, is used as a scrubbing agent to convert ammonia to an ammonium salt. Control of pH and stripping in combination with reboiler or evaporators reduces hydrogen sulfide concentration. The ammonium salt is produced as an aqueous solution, which may crystallized to form a solid product. The ammonium salt solution or solid may be used as a fertilizer.