OP-II-3

PP-III-80A NEW PROCESS OF ANTHRAQUINONE PRODUCTION IN THEPRESENCE OF HETEROPOLY ACID SOLUTIONSZhizhina E.G., Odyakov V.F.Boreskov Institute of Catalysis SB RAS,Prospekt Akad. Lavrentieva, 5, Novosibirsk 630090, Russia;Fax: 8(383)3 30 80 56, E-mail: zhizh@catalysis.ruCatalysis by heteropoly (HP) compounds is an intensively developed direction ofcatalysis especially for processes of fine organic synthesis. The Mo-V-P HP acids(HPA, H 3+х PMo 12-х V х O 40 ) hold a prominent place among HPA because their reducedforms (Н m HPA) are able to be oxidized with dioxygen [1]. Thus, HPA are reversiblyoxidants. We have shown that organic compounds of different classes can beoxidized with high selectivity (90-99%) in the presence of the HPA solutions [1].Catalytic processes of oxidation of any substrates (Su) are combined from twostages (1)+(2) proceeding in different reactors. The target reaction (1) proceeds inreactor 1 at 40-70°C. The catalyst regeneration with O 2 goes in reactor 2 att > 100°С and O 2 pressure.m / 2 Su + m / 2 H 2 O + HPA ⎯⎯→ m / 2 SuO + Н m HPA (1)Н m HPA + m / 4 O 2 ⎯⎯→ HPA + m / 2 H 2 O (2)The HPA solutions have bifunctional (oxidative and acidic) properties. It permitsus to use them as bifunctional catalysts in the process of anthraquinone (AQ)production [2].Acylation of benzene by phthalic anhydride according Friedel-Krafts reactionfollowed by cyclization of ortho-benzoylbenzoic acid is the main industrial process ofAQ preparation. However, a problem of excessive acid catalysts utilization exists inthis process. In another industrial process based on 1,3-butadiene addition to 1,4-naphthoquinone, concentrated alkalies, high boiling organic solvents, and stronginorganic oxidants are used [3]. A growing demand for AQ and its derivatives cannotbe supplied with archaic technologies of their manufacture.We have developed a new one-pot process of AQ production in the presence ofthe HPA solution in 1,3-butadiene atmosphere [1]. At atmospheric pressure (70-80°С), AQ can be produced from hydroquinone (HQ) by scheme (3)+(4) or 1,4-naphthoquinone (NQ) by scheme (4). In that, we have joined the acid-catalyticreaction of diene synthesis with oxidation of its adducts into one technological stage.590