Freezing temperatures of water, alkanoic acids and their mixtures

Barr, R.S.; Newsham, D.M.T.

doi:10.1016/0300-9467(86)80037-5

Cited by 7 publications

(3 citation statements)

References 4 publications

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“…By measuring the CPMG and summing up the first 100 echoes over 20 ms, we were able to follow the melting behavior of the mixtures in the temperature range between À5 C to 22 C. The melting curves are presented in Figure 2. The melting temperature dependence of the mixtures is in agreement with the literature 42 and with the suspected trends-the more water, the lower the freezing point. Additionally, the graph presents the signal from the empty setup (gray line) to show that the box and container do not influence the results.…”

Section: Freezing Temperature Study Of Acetic Acid/water Mixturessupporting

confidence: 90%

CAT on MOUSE: Control and automation of temperature for single‐sided NMR instruments such as NMR‐MOUSE

Mailhiot,

Mankinen,

et al. 2023

Magnetic Reson in Chemistry

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Temperature‐dependent experiments are a rapidly growing area of interest for low‐field NMR. In this work, we present a new device for wide‐range temperature control for single‐sided NMR instruments. The presented device, called CAT, is simple to build, inexpensive, and easy to modify to accommodate different samples. We present the capabilities of the device using a freezing temperature study of acetic acid/water mixtures. Additionally, we present the stability of the device over long measurement times. We believe that by introducing such a device with an open‐source design, we allow researchers to use it in a wide range of applications and to fully incorporate variable‐temperature studies in the world of single‐sided instruments.

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Section: Freezing Temperature Study Of Acetic Acid/water Mixturessupporting

confidence: 90%

CAT on MOUSE: Control and automation of temperature for single‐sided NMR instruments such as NMR‐MOUSE

Mailhiot,

Mankinen,

et al. 2023

Magnetic Reson in Chemistry

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“…(c) The phase diagram for aqueous solutions of AAc. The data points in (c) were obtained by Barr et al36…”

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confidence: 99%

Freezing of Aqueous Carboxylic Acid Solutions on Ice

et al. 2020

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We study the properties of acetic acid and propionic acid solutions at the surface of monocrystalline ice with surface-specific vibrational sum-frequency generation (VSFG) and heterodyne-detected vibrational sum-frequency generation spectroscopy (HD-VSFG). When we decrease the temperature toward the eutectic point of the acid solutions, we observe the formation of a freeze concentrated solution (FCS) of the carboxylic acids that is brought about by a freeze-induced phase separation (FIPS). The freeze concentrated solution freezes on top of the ice surface as we cool the system below the eutectic point. We find that for freeze concentrated acetic acid solutions the freezing causes a strong decrease of the VSFG signal, while for propionic acid an increase and a blue-shift are observed. This different behavior points at a distinct difference in molecular-scale behavior when cooling below the eutectic point. We find that cooling of the propionic acid solution below the eutectic point leads to the formation of hydrogen-bonded dimers with an opposite alignment of the carboxylic acid O−H groups.

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“…The monohydrate, sometimes called acetous acid, was formerly the main article of commerce. Data on solidification points of aqueous acetic acid mixtures have been tabulated, and the eutectic formation mapped (10). The aqueous eutectic temperature is about À26 C. A procedure for concentrating acetic acid by freezing, hampered by eutectic formation, has been sought for some time.…”

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confidence: 99%

Acetic Acid

Wagner

2002

Kirk-Othmer Encyclopedia of Chemical Technology

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Acetic acid, CH 3 COOH, is a corrosive organic acid having a sharp odor, burning taste, and pernicious blistering properties. It is found in ocean water, oilfield brines, rain, and at trace concentrations in many plant and animal liquids, and has a place in organic processes comparable to sulfuric acid in the mineral chemical industries. It is central to all biological energy pathways. Fermentation of fruit and vegetable juices yields 2–12% acetic acid solutions, usually called vinegar. Uses include the manufacture of vinyl acetate, acetic anhydride and terephthalic acid. Vinyl acetate is used to make latex emulsion resins for paints and adhesives. Acetic anhydride is used in making cellulose acetate fibers and cellulosic plastics. About one‐half of the world production comes from methanol carbonylation and about one‐third from acetaldehyde oxidation. Glacial acetic acid is dangerous, but its precise toxic dose is not known for humans. Vinegar, on the other hand, which is dilute acetic acid, has been used in foods and beverages since ancient times.

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Freezing temperatures of water, alkanoic acids and their mixtures

Cited by 7 publications

References 4 publications

CAT on MOUSE: Control and automation of temperature for single‐sided NMR instruments such as NMR‐MOUSE

CAT on MOUSE: Control and automation of temperature for single‐sided NMR instruments such as NMR‐MOUSE

Freezing of Aqueous Carboxylic Acid Solutions on Ice

Acetic Acid

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