The invention relates to the chemical industry and can be used in column apparatus for carrying out processes of rectification, absorption, desorption and extraction in the system “liquid – liquid”. The nozzle element of the mass exchange apparatus contains a shell in the form of a straight circular cylinder with open bases and a liner placed in it. The liner is made in the form of a solid body with open pores with the possibility of passing the processed phases through the shell and preventing the formation of stagnant zones in it.

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