"United States Air Force Academy, Colorado .nqAO surement to prevent the formation of internal concentration The vapor pressures of liquid aluminum chloride-sodium gradients. chloride mixtures containing 53-74 mol % aluminumThe data are given in Table I. Pres.iures have been corrected chloride were measured from the condensation for the vapor pressure of mercury within the isoteniscope. temperatures of solid aluminum chloride to 251 °C.Interactions between A1 2 CI6 vapor and Hg vapor were assumed Samples were contained In Pyrex Isoteniscopes which to be negligible. The measurement method for each datum is * utilized mercury as the manometric fluid. The mercury indicated in the table. Several additional measurements were columns were brought to null by an external pressure made at temperatures lying below the X,t polygon for each of which was In turn measured at each experimental point, the eight compositions richest in AICI 3 . These pressures lay on The b.',er'mental pressures were fit to a single equation the curve of saturated vapor pressure of solid AIC1 3 (10), and which serves the entire composition-temperature region, fell distinctly away from the X,p, Tsurface for AIC1 3 -NaCl melts.WalWe assumed the vapor pressure of AIC1 3 -NaCl melts could We measured the vapor pressure of aluminum chloridebe represented by an equation of the form sodium chloride molten mixtures as part of our continuing in-S vestigation of Iow-meiting molten salt battery electrc.;ytes.Previously reported vapor pressures of this system (2, 3, 5, where 6) are in disagreement by more than an order of magnitude.Preparation of the AiCl 3 , the glovebox atmosphore, lacqng The vapor pressures of individual compositions were fit by other of the isoteniscope, the constant temperature bath and its investigators to equations of the form of eq 1 (3, 5, 6) or eq temperature regulation and measurement, and the measurement 1 modified by the addition to the right-hand side of the term of vapor pressure were all as described previously (10). A .XCp/R log T(1, 2).mercury manometer was used as n additional external piessure The data were least-squares fit in such a way as to minimize measurement device.the perpendicular distance, z, from the experimental points to Powdered mixtures of AIC1 3 and NaCl were loaded into a Pyrex the function surface in X, p, and Tgiven by eq 1 and 2. This isoteniscope similar to that used for saturated AICI vapor procedure is similar to the fitting technique used aarller (10).. pressures (10). NaCl was dried by maintaining it molten for The equations were solved for the values of A) and B which several hours (7). The AICI 3 -NaCl mixtures were prepared by minimized the sum, E,=iNzl where grinding and mixing weighed amounts of AIC1 3 crystals with weighed amounts of dry NaCI crystals in a glovebox. zI=

No abstract

No abstract

This paper describes the design and construction of a system which responds directly to rapid pressure changes and allows a recording of the response on a strip-chart recorder. The device is similar in concept to a recording manometer designed by Svec and Gibbs.