Abstract: Cooling by carbon dioxide. The apparatus comprises:as an expansion member, at least one appliance (5) for the expansion and separation of the solid and gaseous phases, which is interposed between the pipe (3) and the chamber (4) and which has a gaseous-phase outlet and a solid-phase outlet communicating with the chamber via a sealing means (10),a gaseous-phase recovery pipeline (15) connected to the gaseous-phase outlet of the appliance (5),a compressor (16) fed by the recovery pipeline (15),and a means (17) for liquefying the gaseous phase for the purpose of re-using it.Application for the deep-freezing of food products.

Abstract: An arrangement for and method of generating hydrogen wherein hydrogen and hydroride are generated by reacting hydrogen hydride with water. The hydrogen hydride is generated by subjecting hydroride to cryogenic temperature and subatmospheric pressure conditions. This cycle is repeated with the resulting liberation of hydrogen. The hydroride is produced initially and as needed by subjecting water to the action of light photons.