TITLE:
Preparation of Ethyl 4-Nitrobenzoate Using Ultradispersed Natural Zeolite Catalysts, Ultrasound and Microwave Irradiation
AUTHORS:
Tsiuri Ramishvili, Vladimer Tsitsishvili, Tinatin Bukia
KEYWORDS:
Ultradispersed Natural Zeolite, Ethyl 4-Nitrobenzoate, Microwaves, Ultrasound
JOURNAL NAME:
Advances in Chemical Engineering and Science,
Vol.11 No.4,
October
11,
2021
ABSTRACT: The new
possibilities of preparing the ethyl 4-nitrobenzoate by esterification of 4-nitrobenzoic
acid (4-NBA) with ethanol under argon at 80°C are shown; particularly, over catalysts: on
micrometric (4.8 - 7.0 μm) or ultradispersed crystallites (290 - 480 nm) of
hydrogen forms of nanoporous natural zeolites H-CL, H-MOR, H-HEU-M, H-PHI and
under irradiation of the reaction mixture with ultrasound (US, 37 kHz, 330 W, 2
h) or microwaves (MW, 2450 MHz, 300 W, 2 h).
Ultradispersed crystallites of zeolite catalysts were prepared from
hydrogen forms of parent natural zeolites by their treatment with US or MW. In
the esterification, the synergism of the actions of catalysts and MW or US was
revealed; wherein on the ultradispersed best catalysts H-HEU-M and H-MOR
conversion of 4-NBA and yield of ethyl 4-nitrobenzoate reached up to 70% and 67%,
respectively. GC/MS, FTIR, NMR methods were used in the study.