Critical Point and Vapor Pressure Measurements for Nine Compounds by a Low Residence Time Flow Method

Propylene carbonate (PC) wets graphite with a contact angle of 31• at ambient conditions. Molecular dynamics simulations agree with this contact angle after 40% reduction of the strength of graphite-C atom Lennard-Jones interactions with the solvent, relative to the models used initially. A simulated nano-scale PC droplet on graphite displays a pronounced layering tendency and an Aztex pyramid structure for the droplet. Extrapolation of the computed tensions of PC liquid-vapor interface estimates the critical temperature of PC accurately to about 3%. PC molecules lie flat on the PC liquid-vapor surface, and tend to project the propyl carbon toward the vapor phase. For close PC neighbors in liquid PC, an important packing motif stacks carbonate planes with the outer oxygen of one molecule snuggled into the positively charged propyl end of another molecule so that neighboring molecule dipole moments are approximately antiparallel. The calculated thermal expansion coefficient and the dielectric constants for liquid PC agree well with experiment. The distribution of PC molecule binding energies is closely Gaussian. Evaluation of the density of the coexisting vapor then permits estimation of the packing contribution to the PC chemical potential, and that contribution is about 2/3rds of the magnitude of the contributions due to attractive interactions, with opposite sign.

show abstract

“…The experimental critical temperature 15 is Tc = 763 K, whereas the triple temperature is about T triple ≈ 220 K.…”

mentioning

confidence: 97%

Interfaces of propylene carbonate

Chaudhari

Pratt

Pesika

et al. 2013

The Journal of Chemical Physics

View full text Add to dashboard Cite

show abstract

“…The comparison of our and literature data of the enthalpy of vaporization [4,[7][8][9][10][11][12][13] is given in Table 2. For the consistency of the g l H m comparison, all enthalpy of vaporization values were developed from the originally reported vapour pressures [4,[7][8][9][10][11][12][13] using Eqs. (3) and (4).…”

Section: Resultsmentioning

confidence: 99%

Vapour pressure and enthalpy of vaporization of cyclic alkylene carbonates

Verevkin

Toktonov

Chernyak

et al. 2008

Fluid Phase Equilibria

View full text Add to dashboard Cite

“…The vapor phase in the IR analyzer, therefore, consists of N 2 , CO 2 , and little amounts of H 2 O and alkanolamines (MDEA, BEA, and AEEA). The concentration of CO 2 in the IR analyzer is calculated as follows: [7,8], thus MDEA, BEA and AEEA contents in the vapor phase through the analyzer can then be disregarded. After terminating the experiment, a liquid sample was then analyzed by the barium chloride (BaCl 2 ) method [9].…”

Section: Gas and Liquid Analysesmentioning

confidence: 99%

Absorption of Carbon Dioxide in Aqueous Solutions of N-methyldiethanolamine Mixtures

Ma’mun

Svendsen

2018

IOP Conf. Ser.: Mater. Sci. Eng.

View full text Add to dashboard Cite

idAbstract. Carbon dioxide (CO 2 ) is one of the greenhouse gases (GHG) that has contributed to the global warming problem. Carbon dioxide is produced in large quantity from coal-fired power plants, iron and steel production, cement production, chemical and petrochemical industries, natural gas purification, and transportation. Some efforts to reduce the CO 2 emissions to the atmosphere are then required. Amine-based absorption may be an option for post-combustion capture. The objective of this study is to measure the effect of promoter addition as well as MDEA concentration for the CO 2 absorption into the aqueous solutions of MDEA to improve its performances, i.e. increasing the absorption rate and the absorption capacity. Absorption of CO 2 in aqueous solutions of MDEA mixtures were measured at 40 °C in a bubble tank reactor. The systems tested were the mixtures of 30 wt% MDEA with 5 and 10 wt% BEA and the mixtures of 40 and 50 wt% MDEA with 6 wt% AEEA. It was found that for MDEA-BEA-H 2 O mixtures, the higher the promoter concentraation the higher the CO 2 absorption rate, while for the MDEA-AEEA-H 2 O mixtures, the higher the MDEA concentration the lower the CO 2 absorption rate.

show abstract

Critical Point and Vapor Pressure Measurements for Nine Compounds by a Low Residence Time Flow Method

Cited by 48 publications

References 8 publications

Interfaces of propylene carbonate

Interfaces of propylene carbonate

Vapour pressure and enthalpy of vaporization of cyclic alkylene carbonates

Absorption of Carbon Dioxide in Aqueous Solutions of N-methyldiethanolamine Mixtures

Contact Info

Product

Resources

About