Compounds Involved in Production of Synthetic Rubber

Glasgow, Augustus R.; Krouskop, N. C.; Beadle, Joan.; Axilrod, G. D.; Rossini, Frederick D.

doi:10.1021/ac60017a004

Cited by 27 publications

(6 citation statements)

References 31 publications

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“…The center half of the distillate was selected as the "best" portion. The purity of this cyclopropane was determined from measurements of freezing points, according to a procedme previously described (8,9,10], with the following results: freezing point of the actual sampl e, in a ir at 1 atmosphere, -127.53 ±0.01 deg C; calculated freezing point for zero impurity, in air at 1 atmosphere, -127.42 ± 0.04 deg C; calculated amount of impurity, 0.0034± 0.0012 mole fraction. It is calculated that the effect on th e heat of combustion of this amount of the most probable impurity, propylene, would be 0.005 percent.…”

Section: Method Apparatus and Materialsmentioning

confidence: 99%

Heats of combustion and formation of cyclopropane

Knowlton¹,

Rossini²

1949

J. RES. NATL. BUR. STAN.

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The data of this investigation give tJ.Hco = -2091.38 ± 0.54 absolute ki lojo ul es (or -499.S5 ± 0.13 kcal) per mole, at 25° C for the heat of combustion of gaseous cyclopropane in oxygen to form gaseous carbon dixoid e and liquid water. i~Tith this value, the heat of formation of gaseous cyclopropane, from solid carbon (graphite) and gaseous hydrogen each in its thermodynamic standard reference state, is calculated to be tJ.Hr = + 12.74 ± 0.14 kcal/ mole, at 25° C. The heat of isomerization of gaseous cyclopropane into ga eous propylene is calculated to be tJ. 1' [0 = -7.86 ± O.lS kcal/mole, at 25° C.

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Section: Method Apparatus and Materialsmentioning

confidence: 99%

Heats of combustion and formation of cyclopropane

Knowlton¹,

Rossini²

1949

J. RES. NATL. BUR. STAN.

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“…The procedures for determining the purity and triple-point temperature from time-temperature freezing curves and the principles involved have previously been described [2, 3, 4].…”

Section: Determination Of Purity and Triple-point Temperaturesmentioning

confidence: 99%

Thermodynamic properties of some methylphosphonyl dihalides from 15 to 335 ÃƒÆ’Ã¢â‚¬Å¡Ãƒâ€šÃ‚Â°K

Furukawa¹,

Reilly²,

Piccirelli³

et al. 1964

J. RES. NATL. BUR. STAN. SECT. A.

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M eas ur em ents of t h e heat capac it y of mC't h y lph osp ho ny l di flu o ri de (CH , P OF2) , methylphospho nyl di chl o rid e (CI-I 3PO Cl,), and m ethylphospho ny l chlo ro flu o ri de (CH aPOC lF) " 'ere m a de fro m a bo ut 15 to 335 oK by m eans of an adi abat ic calorim C'ter. These hi g hl y react ive and toxic su bstances were pu rifi ed in a com pletely closed glass appa rat us b.v co mbini ng s low crysta ll izat ion a nd fractional m eltin g proced lll·C'S. TI1l' puri t ies dC't('l" min ed b~' t hr fr eezin g-e ur vc mf't hod a re s hown to be generall y in agrC'emc nt with t hosE' valu es ohtain C' c\ h. v t he calo r.imetri c m et hod. From t he r('s ults of t he Iwat, m eaSll re m (' nt~, t he t ri p le-point k mperatu rc, heat o f fu sio n, and t heir co rrespo nclin g est im ated un certai nties \\"('I'e foun d to bp, res pectively, 236.34 ± 0.05 oJ\: and 1I ,878 ± 12 J / mo le fo r CH 3POF 2, 306. Triple-point tC'mpe rat ures obtain ed b.v thp fr cez ing-cu rve me t hod a rc in ag rec m ent \\" ith t he above val lies. A tab le of smoothed values of heat capac ity, enthalpy, entha lp y fun ct io n, ent ropy, G ib bs fr ee ene rgy, and G ibbs frp e e nergy fun ct ion fl'om 0 to 335 OK was obtained from t he d ata. T he ent ropy a nd its co rrespondin g pst im ated unce rt.ainty fo r C H3P OF2, CH 3POC I2, and CH3P OC IF in t heir respcc tive condenspd phase at 298. 1.5 o J( a nd sat urat ion press ure \Vas fo und to be 208.3 ± 0.3, 164.8 ± 0.3 , a nd 216.4 ± 0.4 J /d pg mole, rcs pecti ve ly. The entropies in the gaseo us state fLt 298. 15 OK a nd 1 atm press ure "-ere found to be 312.7 ± 3, 339.7 ± 3, a nd 335.0 ± 3 J /deg mol e, respecti ve ly.

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“…This alloy has more elasticity and hardness than pure platinum. The double helical coil (1) is made by winding one strand of wire on cylinders of the required size. Two ends of the coil are then fused to shaft B at point C. The armature in one model, as shown in part X, was gold plated by the Electrodeposition Section of this bureau.…”

Section: Details Of Ironencased Solenoidmentioning

confidence: 99%