RF Patent # 2042639. Filed 03.04.1992, published 27.07.1995.
Bakhir V.M., Zadorozhny Yu.G.
A flow-through electrochemical modular cell of FEM-2 type, a flow-through electrochemical linear reactor of RPE-L type. Ideologically, FEM-2 module is evolution of FEM-1 module, however, technically it is an absolutely new device that essentially differs from its prototype – FEM-1 module. FEM-2 module is the first device with precisely indicated absolute and relative dimensions of electrode chambers, which is crucial for electrochemical treatment of low-mineralized electrolyte aqueous solutions and fresh water. It also considerably decreases risk of bi-polar areas’ emergence on electrode surfaces. The device can be commercially manufactured using plastic collectors made not by lathing as in case of FEM-1 module, but by casting plastic parts in press-molds. This was achieved thanks to a different structure of collector head end-points and, correspondingly, collector heads themselves.
In the period of legal, that is, in conformity with license agreements and under the authors’ control, manufacture of FEM-2 modules (1992-1995), the joint Soviet-British venture EMERALD produced over 100,000 FEM-2 modules, which were used in STEL, EMERALD and other electrochemical systems.
From 1995, FEM-2 module production, which had been under constant scientific and engineering control of the authors up to that time, along with the production of all electrochemical systems fitted with it, was stopped by the authors due to the development of the third generation of compact-size electrochemical diaphragm-type reactors - FEM-3 modules.