FIELD: chemistry.
SUBSTANCE: stream of a solution of krypton and xenon is fed into a primary concentrate line 1. A large portion of the stream of the solution undergoes vapour-lift evaporation in an evaporator-condenser 2. The remaining portion is gasified in the evaporator 7. The evaporated portion of the solution of the solution is heated in a main heat exchanger 4 and then mixed with the gasified portion to form a stream of gaseous mixture. The gaseous mixture is fed into a physical-chemical purification unit 9, cooled and then undergoes separation in a fractionation column 12 to form a krypton-xenon concentrate product stream and a product solvent vapour stream. In another version, the solvent product stream is heated with a stream of gaseous mixture purified from impurities, mixed with an expanded and heated expander stream, then compressed, cooled and separated into an expander stream which expanded in an expander, and a solvent stream which is cooled in an expander heat exchanger and condensed in a evaporator condenser to form a liquid solvent product.
EFFECT: method increases cost effectiveness, increases extraction of desired components from the incoming solution, increases content thereof in the obtained concentrate, and enables to obtain a solvent product in liquid form or in vapour form.
4 cl, 2 dwg, 1 ex
