Study of processes occurrıng between ethylnaphthalenes and 1-naphthol

Abstract

The work is devoted to the study of an additional method for the synthesis of monoethylnaphthols by the reaction of transethylation of 1-naphthol with ethyl- and diethylnaphthalene, which are by-products of alkylation of 1-naphthol with ethanol and has a small area of application.In the catalytic process carried out in the presence of modified H-mordenite based on 1-naphthol and ethanol, along with the target products (1-ethoxynaphthalene, monoethyl-1-naphthols), up to 10.0% ethyl homologues of naphthalene are obtained. In this regard, the interaction of 1-naphthol with diethylnaphthalenes in the presence of Pd-HSVM and composite mordenite was studied, the effect of pressure on the process, which was identified as an important factor, was studied. In the presence of 1.0 wt % palladium pentasil (x=40), a positive effect of a pressure of 0.5 MPa on the results was noted, the selectivity for monoethyl-1-naphthols was 85.0%, and in the presence of H-mordenite containing zirconium, chromium and sulfur, this indicator was 94.3% under the same conditions. An increase in pressure adversely affects the course of the reaction and increases the rate of other transformations in the process, such as isomerization and disproportionation.