Vapor-liquid equilibrium of mixtures containing formaldehyde, water, and butynediol

Mapping Intimacies ◽

10.31219/osf.io/3mr7u ◽

2021 ◽

Author(s):

Jürgen Berje ◽

Jens Baldamus ◽

Jakob Burger ◽

Hans Hasse

Keyword(s):

Multicomponent Mixture ◽

Chemical Model ◽

Liquid Equilibrium ◽

Vapor Liquid Equilibrium ◽

System P ◽

Physico Chemical ◽

Mass Fractions ◽

Vapor Liquid

Measurements of the vapor-liquid equilibrium in the system formaldehyde þ water þ butynediol wereperformed at 393 K and 413 K for overall formaldehyde mass fractions between 0:1gg?1 and 0:2gg?1and overall butynediol mass fractions between 0:05 g g?1 and 0:35 g g?1. The studied system is acomplex reactive multicomponent mixture as formaldehyde reacts both with formaldehyde and buty?nediol. A predictive physico-chemical model of the vapor-liquid equilibrium from the literature [1] isvalidated by the experiments of the present work. Residue curves are calculated to illustrate thedistillation behavior of the studied system.

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Vapor-Liquid Equilibrium Measurements of Polymeric Solutions – A Review

Buletin Profesi Insinyur ◽

10.20527/bpi.v3i2.72 ◽

2020 ◽

Vol 3 (2) ◽

pp. 99-102

Author(s):

Ianatul Khoiroh

Keyword(s):

Thermophysical Properties ◽

Chemical Properties ◽

Comprehensive Understanding ◽

Liquid Equilibrium ◽

Reliable Measurement ◽

Vapor Liquid Equilibrium ◽

Physico Chemical ◽

Molecular Behavior ◽

Polymeric Solutions ◽

Vapor Liquid

The nature of the molecule of the substance depends heavily on its physico-chemical properties. An accurate and reliable measurement of physical properties is therefore, essentially needed as a framework to gain a comprehensive understanding of the molecular behavior. Of these properties, saturated pressure is one of the most important thermophysical properties in the design of products, equipment, and processes in various chemical industries. In this review, various techniques that have been utilized in measuring the vapor-liquid equilibrium (VLE) for polymeric solutions are discussed.Keywords: VLE, polymer, measurements, pressure.

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Vapor–liquid Equilibrium and Distillation of Mixtures Containing Formaldehdye and Poly(oxymethylene) Dimethyl Ethers

10.31219/osf.io/8uarg ◽

2021 ◽

Author(s):

Niklas Schmitz ◽

Christian F. Breitkreuz ◽

Eckhard Stöfer ◽

Jakob Burger ◽

Hans Hasse

Keyword(s):

Liquid Equilibrium ◽

Vapor Liquid Equilibrium ◽

Diesel Fuels ◽

Production Processes ◽

Physico Chemical ◽

Different Types ◽

Group A ◽

Continuous Distillation ◽

Bottom Product ◽

Vapor Liquid

Poly(oxymethylene) dimethyl ethers (OME, H3C–O–(CH2O)n–CH3) are promising synthetic diesel fuels. Fordesigning OME production processes, a model for describing the vapor–liquid equilibrium (VLE) in mixtures of(formaldehyde + water + methanol + methylal + OME + trioxane) is needed. Building on previous work ofour group, a physico-chemical model for the VLE in these mixtures is developed in the present work. For thedevelopment and the testing of the model, experiments of different types were carried out: VLE measurements ina thin film evaporator, batch evaporation experiments in an open still, and continuous distillation experiments ina laboratory column. The model predicts the results of the distillation experiments well. It is shown that OMEwith n ≥ 3 can be separated as bottom product from mixtures of formaldehyde, water, methanol, methylal, andOME with n ≥ 2. This separation is a critical step in a novel OME production process that increases the sustainabilityof OME production.

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