𝔖 Bobbio Scriptorium
✦   LIBER   ✦

Studies in coal tar bases. I. Separation of β- and γ picolines and 2:6-lutidine

✍ Scribed by Coulson, E. A. ;Jones, J. Idris

Publisher
Wiley (John Wiley & Sons)
Year
1946
Weight
772 KB
Volume
65
Category
Article
ISSN
0368-4075

No coin nor oath required. For personal study only.

✦ Synopsis

Abstract

Tar base fractions commonly described as “commercial β‐picoline” are mixtures containing β‐ and γ‐picoline and 2 : 6‐lutidine in variable, if usually roughly equal proportions. Many methods for the separation of one or more of the individual components have been proposed yet few are suitable for commercial exploitation. In the present paper it is shown that by azeotropic fractional distillation the three bases may be readily separated in purities of 95‐98% and with little loss, if acetic or propionic acids are used as azeotropic‐formers, and it is possible to recover for re‐use the acids from the separate base‐acid azeotropes with the aid of a suitable hydrocarbon entrainer.

It is also shown that the hydrochlorides of the bases differ very markedly in physical properties and can be easily separated.

Pure specimens of the three bases were obtained by fractional freezing of 95‐88% pure materials : 2 : 6‐lutidine, b.p. 144°, f.p. −5·97°; β‐picoline b.p. 1447middot;0°, f.p. −177middot;77°; γ‐picoline b.p. 145·37°, f.p. + 47middot;3°.

📜 SIMILAR VOLUMES

Studies in the coal tar bases. II. The i
Studies in the coal tar bases. II. The isolation of 2-methyl-6ethylpyridine from a lutidine fraction
✍ Jones, J. Idris 📂 Article 📅 1950 🏛 Wiley (John Wiley & Sons) ⚖ 224 KB

## Abstract 2‐Mcthyl‐6‐cthylpyridinc, hitherto not reported as a coal tar constituent, has been isolated from a lutidine fraction of coal tar bases as an zoetrope with proionic acid. Its orientation has been established by oxidation to picolinic acid and by comparison of its ultraviolet absorption

High-Pressure Stopped-Flow Study of the
High-Pressure Stopped-Flow Study of the Kinetics of Base Hydrolysis of the Dichromate Ion by Hydroxide Ion, Ammonia, Water, and 2,6-Lutidine in Aqueous Solution
✍ Peter Moore; Yves Ducommun; Peter J. Nichols; André E. Merbach 📂 Article 📅 1983 🏛 John Wiley and Sons 🌐 German ⚖ 184 KB

## Abstract Volumes of activation for the base hydrolysis of the dichromate anion have been measured at 298.2 K, using high‐pressure stopped‐flow spectrophotometry. The values of Δ__V__\* (cm^3^ · mol^−1^), − 17.9 ± 0.6, − 19.2 ± 0.9, − 24.9 ± 0.9 and − 26.0 ± 0.7 for OH^−^, NH~3~, H~2~O and 2,6‐lu