METHOD FOR SEPARATING AMMONIA FROM CIRCULATING GAS FOR AMMONIA SYNTHESIS AND DEVICE FOR ITS IMPLEMENTATION Russian patent published in 2023 - IPC C01C1/12 B01D53/14 B01D53/22 

FIELD: chemical synthesis.

SUBSTANCE: selective separation of ammonia from the Haber-Bosch process circuit using a hybrid method of membrane-absorption gas separation, method can be used in the process of ammonia synthesis in the gas and other chemical industries. The method for separating ammonia from the circulating gas of ammonia synthesis is characterized by the fact that, using one of the two input fittings, a liquid absorbent is supplied until a liquid level appears in the viewing window on the side of the other fitting, which fills the intermembrane space between the hollow fiber gas separation membrane of a smaller diameter and a hollow fiber pervaporation membrane of larger diameter. Then the fittings for introducing the liquid absorbent are closed and through the fitting for the input of the feed flow, circulating ammonia synthesis gas is supplied at a speed of 5-50 ml/min with a pressure of 4-10 bar into the internal volume of the outer casing, then it passes through the hollow fiber pervaporation membrane, separated by preferential dissolving ammonia in the volume of liquid absorbent, which passes through the hollow fiber gas separation membrane and enters the purged cavity, from where it is removed by the flow of purge gas. The purge gas is supplied through the carrier gas inlet fitting, in the permeate stream through the permeate outlet fitting in the carrier gas stream, and the remaining components of the ammonia synthesis cycle gas that are not dissolved in the absorbent liquid exit the internal volume of the outer casing through the outlet fitting retentate flow. The gas separation process is carried out at temperatures of 20–40°C.

EFFECT: providing a method with increased productivity of ammonia separation in the volume of one mass transfer apparatus and a device for its implementation.

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