Apparatus for recovering products of the electrolysis of an alkali metal chloride solution, comprising: an electrochemical reactor represented by one or more modular electrochemical cells hydraulically connected in parallel, wherein an anode compartment and a cathode compartment of the reactor are divided by a porous tubular ceramic diaphragm coaxially arranged between electrodes (2, 3) of the modular electrochemical cells, a device for supplying saline solution under pressure connected to an inlet of the anode compartment, a device for stabilising a predetermined overpressure in the anode compartment, which is connected to an outlet of the anode compartment, a mixing device for gaseous products of the anodic electrochemical reaction with fresh water flow, which is connected to the device for stabilising the predetermined overpressure in the anode compartment, a catholyte circuit comprising the cathode compartment of the electrochemical reactor, a capacitive separator for separating hydrogen from the catholyte, means for discharging the excess catholyte from a receiving tank of the separator and a heat exchanger for cooling the circulating catholyte, and a dosing pump for adding the catholyte to the oxidant solution to regulate its pH, characterised in that the catholyte circuit includes a circulation pump with overflow device for the return of the pumping liquid, which ensures the forced circulation of the catholyte continuously through the heat exchanger, the cathode chamber and the capacitive separator for the separation of the hydrogen from the catholyte, the receiving tank of the separator connected to the pump inlet is lower than the electrochemical reactor, such that the level of the catholyte in the receiving tank of the separator, which is determined by the position of the spigot (attached pipe) for the discharge of the excess catholyte from the circuit, is below the inlet spigot from the cathode compartment of the electrochemical reactor, and a cooled moisture separator is installed in the discharge of the hydrogen from the capacitive separator, the condensate collecting tank of which is connected via the metering pump to the feed line of the fresh water to the mixing device of the fresh water flow with the gaseous oxidant mixture. an electrochemical reactor represented by one or more modular electrochemical cells hydraulically connected in parallel, wherein an anode compartment and a cathode compartment of the reactor are divided by a porous tubular ceramic diaphragm coaxially arranged between electrodes (2, 3) of the modular electrochemical cells, a device for supplying saline solution under pressure connected to an inlet of the anode compartment, a device for stabilising a predetermined overpressure in the anode compartment, which is connected to an outlet of the anode compartment, a mixing device for gaseous products of the anodic electrochemical reaction with fresh water flow, which is connected to the device for stabilising the predetermined overpressure in the anode compartment, a catholyte circuit comprising the cathode compartment of the electrochemical reactor, a capacitive separator for separating hydrogen from the catholyte, means for discharging the excess catholyte from a receiving tank of the separator and a heat exchanger for cooling the circulating catholyte, and a dosing pump for adding the catholyte to the oxidant solution to regulate its pH, the catholyte circuit includes a circulation pump with overflow device for the return of the pumping liquid, which ensures the forced circulation of the catholyte continuously through the heat exchanger, the cathode chamber and the capacitive separator for the separation of the hydrogen from the catholyte, the receiving tank of the separator connected to the pump inlet is lower than the electrochemical reactor, such that the level of the catholyte in the receiving tank of the separator, which is determined by the position of the spigot (attached pipe) for the discharge of the excess catholyte from the circuit, is below the inlet spigot from the cathode compartment of the electrochemical reactor, and a cooled moisture separator is installed in the discharge of the hydrogen from the capacitive separator, the condensate collecting tank of which is connected via the metering pump to the feed line of the fresh water to the mixing device of the fresh water flow with the gaseous oxidant mixture.