Abstract: Prills of ammonium dinitramide (ADN) are prepared by melting this salt with a stabilizer and, by dry nitrogen pressure, injecting the molten salt i an inert, perfluorinated carrier liquid of greater specific gravity which, initially, is above the solidification temperature of the salt. The molten salt and carrier liquid pass together in turbulent flow through a heated conduit in which stationary vanes disperse the salt into droplets. The liquid and salt then pass in turbulent flow through a cooled conduit for solidification of the salt into prills without agglomeration. The prills are then separated from the liquid by flotation and any liquid carried with the prills recycled. The main flow of carrier liquid is pumped through a preheater and then back to the molten salt injector. The cooled conduit is provided with compression refrigeration, the refrigerant passing in parallel flow along the conduit and the compressed refrigerant passing to the preheater before condensation.

Abstract: Prills are prepared by melting a salt and introducing the molten salt into carrier liquid. Oxidizing salts of ammonia, ammonium nitrate (AN) and ammonium dinitramide (ADN) are melted with a stabilizer and introduced by dry nitrogen pressure into an inert, perfluorinated carrier liquid of greater specific gravity than the molten salts. In a first embodiment, the carrier liquid is quiescent and below the salt solidification temperature so that prills solidify from drops of the salt rising through a column which substantially retains the liquid. In a second and continuous embodiment, the carrier liquid is initially above the solidification temperature, and the salt is injected into the moving liquid which passes with the molten salt in turbulent flow through a heated conduit, in which stationary vanes disperse the salt into droplets, and then through a cooled conduit for solidification of the salt into prills without agglomeration.

Abstract: A voltage regulator is disclosed for a photovoltaic panel (PVP) battery cging system having a relay switch in series with a reverse current blocking diode disposed between the positive terminals of the photovoltaic panel and the battery to be charged. A variable resistor is wired in series with the coil of the relay in such manner that the voltage drop across the combination will equal the potential difference across the terminals of the battery being charged at a point in time when the normally closed relay switch will be caused to open to discontinue further charging of the battery and prevent overcharge. The reverse current blocking diode is customarily provided to prevent discharge of the battery through the PVP at night.

Abstract: A composite insulated wall includes a pair of outer poured concrete layers cured in a form and an organic or inorganic insulating panel or panels disposed between the concrete layers and retained in place by a number of lateral tie-rods extending through the insulating panel and into the concrete.