METHOD OF PROCESSING SPENT GLYCOL-CONTAINING ANTI-ICING FLUID FOR AIRCRAFT Russian patent published in 2024 - IPC C07C29/76 C07C31/20 C09K3/18 

FIELD: performing operations.

SUBSTANCE: present invention relates to a method of processing spent glycol-containing anti-icing fluid. This method is characterized by the fact that water stripping from the filtered and preheated solution of the spent anti-icing liquid is carried out in a mechanical steam recompression unit containing a heat exchanger of the mechanical steam recompression unit, an adjacent vessel and a compressor. Heat exchanger of this unit comprises a tubular part and a lower vessel, where the tubular part has an annular space and a plurality of tubes, and the lower vessel is made interconnected with the adjacent vessel by means of two branch pipes. Heat exchanger is equipped with condensate discharge means. Water stripping is carried out by directing the filtered and preheated solution into the tubes of the heat exchanger of the mechanical vapour recompression unit, where in the process of stripping when the solution flows through the tubes, the lower and adjacent vessels are partially filled with the concentrated solution with accumulation of water vapour above it. Concentrated solution is again directed into the tubes of the heat exchanger as a recycle, and water vapour from the reservoirs is heated by means of a compressor and forced into the tube space of the tubular part of the heat exchanger. Formed water vapour condensate by means of condensate removal means of heat exchanger is removed from heat exchanger of mechanical vapour recompression unit to preheating heat exchanger, where due to the heat energy transfer from the said condensate, the filtered solution supplied to the mechanical vapour recompression unit is preheated.

EFFECT: increasing the efficiency of the method by reducing energy costs.

5 cl, 1 dwg