Why is ammonia liquor used as the flushing liquor for condensing and cooling hot crude coke oven gas and what other liquid can be used?

Ammonia liquor is used as the flushing liquor for condensing and cooling hot crude coke oven gas because it effectively absorbs ammonia and other nitrogen compounds, which helps reduce environmental pollution and recover valuable byproducts. Its high solubility in water allows for efficient gas scrubbing and cooling. An alternative liquid that can be used for this purpose is water itself, though it is less effective in recovering ammonia compared to ammonia liquor.