Abstract:
A lithium-water battery provides reliable power for long durations in the ocean at temperatures down to 0.degree. C. and pressures up to 680 atmospheres (10,000 psi) without the need for mechanical pumps or valves to admit reactant water from the ocean into the battery or to maintain a circulating electrolytic solution in the battery. The battery has a natural circulation, alkaline, aqueous electrolyte contained in the housing with a lithium anode and a cathode disposed in the electrolytic solution. A hydrophilic cation exchange membrane attached to the housing is disposed between the electrolytic solution and the ocean environment surrounding the battery for retaining the hydroxyl ions in the alkaline electrolytic solution while admitting water into the solution from the environment.Advantageously, a low power lithium-water battery can provide several watts at about 1.4-1.5 volts for up to a year or more anywhere in the ocean.
Abstract:
Chromic acid is now efficiently prepared in a process using dichromate, such as the dichromate typically available as an intermediate in the chromic acid production from chrome ore. In the process, the dichromate is introduced into the center compartment of a three-compartment electrolytic cell and dichromate-containing center compartment electrolyte flows through a porous diaphragm into the anode compartment of the cell. Electrolyte is introduced to the cell cathode compartment which is separated from the center compartment by a substantially hydraulically impermeable cation-exchange membrane means. During electrolysis, chromic acid is prepared in the anolyte and alkali product is produced in the catholyte.
Abstract:
The invention is a method of recharging a thermal battery after it has been activated and at least partially discharged and the battery is still at a temperature where the electrolyte is still active. The method comprises the step of at least partially recharging the battery prior to the battery temperature reaching a level where the electrolyte becomes non-active. The method optionally may include insulation or supplemental heater system about the thermal battery.
Abstract:
A metal-air battery having a liquid electrolyte above which is an air plenum. The battery includes a horizontally or vertically disposed anode completely within the electrolyte and a reticulated cathode arrangement which floats at the surface of the electrolyte and can accommodate for changes in the liquid level.
Abstract:
The present disclosure relates to a cathodic protection system for inhibiting oxidation of a reinforcing member disposed within a cementitious structure. The system comprises a compact, autonomous battery adapted to mount to the cementitious structure at an open-air location, the battery having a positive terminal and a negative terminal, a conductor adapted to electrically connect the negative terminal of the battery to the reinforcing member of the cementitious structure, an anode jacket constructed of a cementitious material and being adapted to be placed in physical contact with the cementitious structure, and an anode disposed within the anode jacket and being adapted to be positioned proximate to a portion of the reinforcing member disposed within the cementitious structure that is to be cathodically protected, the anode being electrically connected to the positive terminal of the battery.
Abstract:
Chromic acid production is now simplified in a process using the concentrated dichromate typically available at an intermediate stage when chromic acid is produced from chrome ore. In the process, the dichromate is treated in a three-compartment cell as, for example, after removal of the sulfate or carbonate salt evolved in the overall production process. The dichromate feed enters the center compartment of the three-compartment cell and then flows through a porous diaphragm to the anode compartment of the cell and is electrolyzed at elevated current density. Depleted feed solution may be withdrawn from the center compartment and recirculated for reuse. Concentrated, water-white alkali product is produced in the cathode compartment. The anolyte from the cell, rich in chromic acid, can be concentrated, cooled, and the chromic acid recovered. Liquid removed from chromic acid recovery can be recirculated for subsequent electrolysis, as by combination with the feed. Both alkali product and anolyte chromic acid can be produced at enhanced current efficiency.