Azeotropy in binary systems formed by components of the absorption fraction of coal tar
It was shown that indole, together with phenols and bases, is the main azeotrope-forming component in the absorption fraction of coal tar, and the presence and concentration of indole in it determine the technological limitations on isolation of napthalene homologs and biphenyl. In addition to indole, the absorption fraction contains small amounts (about 1%) of its homologs. Indole forms minimum-boiling azeotropes with components of the naphthalene homologous series, boiling in the range 237 to 270/sup 0/C. Azeotrophy in series formed by indole homologs with naphthalene homologs can be examined on the basis of existing experimental and predicted data on azeotropy in zeotropic-azeotropic series formed by indole with naphthalene homologs and by 2-methylindole with naphthalene homologs. For example, the systems indole-2,3-dimethylnaphthalene and 2,3-dimethylnaphthalene-2-methylindole are azeotropic; therefore the systems formed by 1,6-dimethylnaphthalene with indole homologs boiling in the range 254.5 to 274/sup 0/C are also aqeotropic. Therefore binary systems formed by naphthalene homologs boiling in the range 265.2 to 270/sup 0/C with indole homologs boiling in the range 254.5 to 274.2/sup 0/C are zaeotropic, and consequently the series formed by naphthalene homologs with indole homologs are zeotropic-azeotropic. Since not only indole but also its homologs are principal azeotrope-forming components in the absorption fraction of coal tar, this imposes technological limitations on isolation of dimethylnaphthalenes and acenaphthenes by rectification.
- Research Organization:
- Ural Polytechnic Inst., Sverdlovsk, USSR
- OSTI ID:
- 5542471
- Journal Information:
- J. Appl. Chem. USSR (Engl. Transl.); (United States), Journal Name: J. Appl. Chem. USSR (Engl. Transl.); (United States) Vol. 54:7; ISSN JAPUA
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
010500* -- Coal
Lignite
& Peat-- Products & By-Products
ACENAPHTHENE
AROMATICS
AZEOTROPE
AZOLES
BINARY MIXTURES
BIPHENYL
BOILING POINTS
COAL TAR
CONDENSED AROMATICS
DATA
DISPERSIONS
EXPERIMENTAL DATA
FLUORENE
HETEROCYCLIC COMPOUNDS
HYDROCARBONS
INDOLES
INFORMATION
MIXTURES
NAPHTHALENE
NUMERICAL DATA
ORGANIC COMPOUNDS
ORGANIC NITROGEN COMPOUNDS
OTHER ORGANIC COMPOUNDS
PHYSICAL PROPERTIES
PROCESSING
PYRROLES
SEPARATION PROCESSES
TAR
THERMODYNAMIC PROPERTIES
TRANSITION TEMPERATURE