I. AN IMPROVED GAS-LIQUID CALORIMETER AND A COMPARISON WITH PREVIOUS MODELS. II. BUTTRESSING EFFECT IN 2-METHYL-3-TERT-BUTYLPYRIDINE AND 2,6-DIMETHYL-3-TERT-BUTYLPYRIDINE
Abstract
An improved gas-liquid calorimeter has been developed which can be used in connection with a high vacuum apparatus for measuring the heats of reaction of air sensitive gases with solutions. This calorimeter (Graves model) which utilizes a thin wall glass reaction chamber was compared with previous models which employed platinum reaction chambers.The known advantages of glass over platinum were realized in that the effective thermal leakage modulus of the Graves model was significantly lower than that of a corresponding platinum model. The values were determined to be, K =-3.41 x 103 deg./min./deg. for the Graves model and K 4.42 x 10 deg./min./deg. for the platinum Olcott model. It is significant that the use of a thin wall glass reaction chamber gives values for the heat capacity and thermal lag not only comparable but superior to those of a platinum model (Graves, Cp, 2.37 0.07 cal./deg.; Olcott, Cp, 3.58 ± 0.06 cal./deg.).
Degree
Ph.D.
Subject Area
Organic chemistry
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