Improvements in or relating to conduits

... In the production of a glass conduit having an electrode embedded in its inner surface, the electrode 1, 2 is positioned on a former 3 by means of a spacing material 5, 6 of glass, the whole assembly is encased with a glass compatible with the spacing material, the assembly heated to a temperature at which the encasing material and the spacing material fuse and the former 3 is subsequently extracted. Glass fibres 5, 6 are wound on the former between the wire electrodes 1, 2 in the form of a multi-start helix and a tube of glass drawn down, as it softens under heat, on to the assembly. The electrodes are of platinum and the former may be of copper which is extracted by stretching and withdrawing or removed as by nitric acid.

Improvements in or relating to deuterium concentration processes

D2 is concentrated by contacting gaseous H2 with a liquid mixture of NH3 and a primary or secondary aliphatic amine, or a fully hydrogenated cyclic secondary amine, containing an ionic catalyst, e.g. potassamide, for the H2 isotope exchange reaction between liquid NH3 and gaseous hydrogen. The aliphatic amine may be methyl-, dimethyl- or diethyl-amine and the cyclic amine may be pyrrolidine or piperidine or homologues thereof, e.g. 2-methyl-pyrrolidine. In an example, dimethylamine was added to a mixture of liquid NH3 and potassamide, and H2 gas was bubbled, using a sintered glass disc, once through the mixture at -46 DEG C. in a vertical column which was externally cooled. The above process may be applied to a dual-temperature exchange system, in which a stream of liquid NH3 is passed successively through contacting apparatus at two different temperatures countercurrently to a stream of gaseous H2, both NH3 and H2 being recirculated.

Verfahren zur Anreicherung von Deuterium im Ammoniak durch Isotopenaustausch zwischen Wasserstoff und Ammoniak in Gegenwart von Kaliumamid