Res. Chem. Intermed.
, Vol. 27, No. 3, pp. 249–258 (2001)
L. KURC, V. VOPRAVIL and L.
Department of Organic Technology, Institute of Chemical Technology, Prague, Technická 5, 166 28,
Praha 6, Czech Republic
Received 17 February 2000; accepted 1 November 2000
Abstract—Catalytic oxidation rate of 2-ethyl-5,6,7,8-tetrahydro-9,10-anthrahydroquinone
(ETHAHQ) using oxygen in a stirred reactor was studied. It was found that NaOH and some amines
exhibit catalytic properties suitable for this oxidation. In the presence of NaOH with its amount-
of-substance concentration of 2 mmol /l
, ve times increased reaction rate is achieved. Ad-
ditionally, mineral acids (sulphuric and phosphoric) and antioxidants (diphenylamine, N-isopropyl-
4-diphenylamine) were used for a thorough study of partial mechanism steps and their rates during
oxidation. Experimental results were used for determination of the rate limiting step of the ETHAHQ
oxidation. It was the hydrogen elimination from hydroxyl of hydroquinone.
: Oxidation; 2-ethyl-5,6,7,8-tetrahydro-9,10-anthrahydroquinone; oxygen; catalysis; H
Industrial production of hydrogen peroxide via the so-called anthraquinone method
is a process during which H
is produced in discontinuous cyclic oxidation and
reduction transformations of anthraquinone derivatives according to the following
2-Alkyl-5,6,7,8-tetrahydro-9,10-anthraquinone or 2-alkyl-9,10-anthraquinone are
used as the substrates for the production of H
. In the industrial practice, solution