RECOVERY METHOD OF AMMONIA

• Main Authors: UNNO HIROSHI, ITO AKITOSHI, FUJIMURA YASUSHI
• Format: Patent
• Language: English; Japanese
• Published: 14.06.2018
• Subjects: AMMONIA; BLASTING; CHEMISTRY; COMBINED HEATING AND REFRIGERATION SYSTEMS; COMPOUNDS THEREOF; CYANOGEN; HEAT PUMP SYSTEMS; HEATING; INORGANIC CHEMISTRY; LIGHTING; LIQUEFACTION SOLIDIFICATION OF GASES; LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS; MANUFACTURE OR STORAGE OF ICE; MECHANICAL ENGINEERING; METALLURGY; MIXTURES BY PRESSURE AND COLD TREATMENT; PERFORMING OPERATIONS; PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL; REFRIGERATION OR COOLING; SEPARATION; TRANSPORTING; WEAPONS

PROBLEM TO BE SOLVED: To prepare ammonia efficiently without an additional heat source by flash evaporation of at least a part of ammonia from absorption liquid which is rich in ammonia following absorption and separation of ammonia, which resolves the above problem.SOLUTION: A recovery method of ammonia which comprises reacting gas containing nitrogen with hydrogen, absorbing and separating ammonia from a resulting product gas with ammonia absorption liquid at temperature from 20 to 80°C, desorbing at least a part of ammonia from the ammonia rich absorption liquid which absorbed and separated ammonia by flash evaporation, condensing evaporated ammonia gas to recover ammonia as liquid ammonia, and recovering the ammonia lean absorption liquid which desorbed ammonia to use it as the ammonia absorption liquid.SELECTED DRAWING: Figure 1 【課題】アンモニアを吸収分離したのち、アンモニアリッチ吸収液から少なくとも一部のアンモニアをフラッシュ蒸発させて回収させることによって、上記課題を解決し、追加の熱源の必要なく効率的にアンモニアを合成する。【解決手段】窒素含有ガスと水素を反応させて、得られた生成ガス中のアンモニアを２０〜８０℃の温度で、アンモニア吸収液によって吸収分離し、アンモニアを吸収分離したアンモニアリッチ吸収液から少なくとも一部のアンモニアをフラッシュ蒸発により放散させて、気化した気体アンモニアを凝縮させて液体アンモニアとして回収するとともに、アンモニアを放散させたアンモニアリーン吸収液を回収して、アンモニア吸収液として利用することを特徴とするアンモニアの回収方法。【選択図】図１