Other

Novruz I Guseinov

Vagab S Aliev

Sakhib M Aliev

Dzhavid N Khydyrov

Rafail S Sverdlov

Medzhid A Mardanov

Nuri T Sultanov

Shamkhal A Mamedov

Vagif A Nagiev

Farrukh R Gadzhiev

The process for preparing methyl isocyanate includes feeding methyl halide through a reaction mixture at a rate of 0.5 to 3 moles of methyl halide per mole of cyanate per hour, the contact time being 1 to 4 min and a molar ratio of an organic solvent to methyl halide being (3 to 5):1 with subsequent withdrawal of the product out of the reaction zone.

Process for preparing methyl isocyanate

A method for preparing .alpha.-naphthol according to the present invention comprises sulphonation of naphthalene with an equimolar amount of a concentrated sulphuric acid at a temperature ranging from 30.degree. to 85.degree. C. for a period of from 60 to 120 minutes in the presence of acetic anhydride whereafter .alpha.in an amount of from 0.5 to 1.5 mole per mole of naphthalene. The resulting naphthalene-.alpha.-sulphonic acid is fused with an alkali taken in an amount of 3-4 moles per mole of naphthalene-.alpha.-sulphonic acid at a temperature ranging from 180.degree. to 285.degree. C. for a period of from 10 to 30 minutes. The resulting melt consisting of the alkali metal .alpha.-naphtholate and the alkali metal sulphite is mixed with a polar solvent; the resulting mixture is acidified with a mineral acid taken in an amount equimolar relative to the alkali metal .alpha.-naphtholate, whereafter.alpha.-naphthol is separated from the resulting suspension. The method according to the present invention makes it possible to increase the yield of .alpha.-naphthol up to 98% of the theoretical amount and produce .alpha.-naththol with a purity of up to 99.5%.

Method for preparing .alpha.-naphthol

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Novruz I Guseinov