Experimental pressure versus temperature isochoric – isoplethic curves for n-pentane – dimethyl ether, n-pentane – dimethyl ether – polybutadiene and n-pentane – dimethyl ether – polybutadiene– hydrogen at high pressures

Abstract

Experimental pressure versus temperature isochoric-isoplethic curves for n-pentane-dimethyl ether, n-pentane-dimethyl etherpolybutadiene and n-pentane-dimethyl etherpolybutadiene-hydrogen at high pressures.

Hydrogenation of Polybutadiene at High Pressure

“…Table presents selected experimental data taken from ref for the nonreactive system PB+DME+C 5 +H 2 . In such experiments, the dependent variable was the measured pressure, and the specified variables were global composition, overall density, and temperature. The PVT-composition conditions in Table were in this work taken as reference conditions for the hydrogenation experiments.…”

“…The PB, which was synthesized through high vacuum anionic polymerization following a standard procedure, was already considered in a previous work . Grupo Linde Gas Argentina S.A. (Buenos Aires, Argentina) provided the H 2 (1333-74-0 CAS number), 97.0% pure.…”

“…The high-pressure hydrogenation reactions were performed in the same constant-volume cell used in previous publications to obtain isochoric–isoplethic experimental data. , The experimental setup and the details of the constant-volume reactor are shown in Figures and . Briefly, the reactor (7, Figure ) is a stainless-steel tube (closed at both ends, no sight windows) with a nominal diameter of 1.27 × 10 –2 m and wall thickness of 2.5 × 10 –3 m. The inner volume of the cell is 1.893 × 10 –5 ± 0.008 × 10 –5 m 3 .…”

“…Accordingly, hydrogenation reactions were carried out using 10, 15, or 20 times the stoichiometric amount of H 2 (i.e., the H 2 excess was 9, 14, or 19 times the stoichiometric amount, respectively). All the reactions were performed using an initial overall PB concentration of about 3% w/w …”

“…As already mentioned, the initial global composition and the overall mass density conditions of a reactive mixture were selected according to the results of preliminary hydrogenation experiments and previous PVT experimental information for nonreactive systems . Moreover, the procedure is almost identical to that of the nonreactive isochoric–isoplethic experiments.…”