Abstract: An apparatus for chlorinating swimming bath water, includes an electrochemical cell (2) with an anolyte chamber (25) and a catholyte chamber (22), which are separated by an ion-selective diaphragm (290), a metering device (7) for supplying consumption hydrochloric acid to the cell (2), a chlorine gas outlet from the upper space (26) of the anolyte chamber (25), a chlorine gas pipe (29) for transferring chlorine gas from the cell (2), to a circulation pipe (15) for the bath water, an ejector (10) connecting the chlorine gas pipe (29) to the bath water pipe (15). The ejector (10) is adapted to generate a pressure in the chlorine gas pipe (29) which is lower than atmospheric pressure, and a gas flow in the gas pipe (29) which is greater than the greatest chlorine gas production flow of the cell (2). An atmospheric air pipe (35,45) communicates with the chlorine gas pipe (29). A liquid trap device (3) is arranged in the air pipe.

Abstract: A catalyst element is described which is intended for use in a reactor for a chemical reaction where a lyophobic fluid is contacted with a lyophilic fluid for a reaction in the presence of catalyst in said element. The essential feature of the elements is that it is in the form of a porous lyophobic, e.g. hydrophobic, body which has a pore size essentially below 20 .mu.m, and is provided with a surface layer having a thickness of at most 100 .mu.m of lyophilic, e.g. hydrophilic, catalyst particles with a size essentially below 50 .mu.m, across part of its periphery only, said catalyst layer having been formed by sintering and/or pressing the catalyst particles into the porous lyophobic body.Preferable shapes of said catalyst element are a plate or a so-called packing element.Furthermore, a process for the preparation of said element is disclosed, which comprises adhering a surface layer of lyophilic catalyst to part of the periphery of a porous lyophobic body by sintering and/or pressing.

Abstract: A method of joining together a plurality of graphite members providing a low transition resistance is described. The method includes the steps of interposing a layer of a thermally sensitive material between the graphite members to be joined, applying pressure to force the graphite members together, applying sufficient heat to melt the thermally sensitive material, and releasing the pressure after providing a period of time for cooling. The thermally sensitive material is preferably composed from a thermoplastic material, and the heat for melting this material is preferably provided by resistance brazing.

Abstract: A method of joining two metal members to a graphite member to form a structure having a low transition resistance is described. The method includes the steps of providing a plurality of openings in the graphite member, interposing the graphite member between the two metal members and positioning the metal members to cover the openings in the graphite member, and resistance spot welding the metal members to the graphite member at the openings in the graphite member. This method is advantageous in forming a bus-bar connection between a pair of opposite polarity graphite electrodes in an electrochemical cell stack, such as a zinc-chloride battery. In this particular application, it is preferred that titanium be used for the metal members.