818 zyxwvutsrqponmlkjihgfedcbaZYXWVUTSRQPONMLKJIHGFEDCBA Ind. Eng. Chem. Res. 1992,31, 818-827 zyxwvutsrqponmlkjihgfedcbaZYXWVUTSRQPO De70 zyxwvutsrqpo eo = - zy rp2 The initiation rate equation is obtained from the dimen- sionless form of eq A57. bD31'2CCo3+CArCHO(s) zyxwvutsrq ki Ri = (A60) rP k2'I2 Registry No. Benzaldehyde, 100-52-7; perbenzoic acid, 93-59-4. Literature Cited Bawn, C. E. H. Freeradical Reaction in Solution Initiated by Heavy Metal Ion. Discuss. Faraday Soc. 1953,14, 181-190. Blyumberg, E. A.; Malievshii, A. D.; Emanuel, N. M. Effect of Sol- vents on the Mechanism of Liquid-phase Oxidation of n-Butane. Int. Chem. Eng. 1964,4,400-404. Bykovchenko, V. G.; Berezin, L. V. A Study of the Kinetics and Mechanism of Cyclodecaneby Molecular Oxygen IV Study of the Oxidation Mechanism of Cyclododecane by the Inhibition Me- thod. Int. Chern. Eng. 1964,4,391-397. Caloyannis, A. G.; Graydon, W. F. Heterogeneous Catalysis in the Oxidation of p-xylene in the Liquid Phase. J. 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Received zyxw for review May 30, 1991 Accepted November 5,1991 VII, pp 526-532. 31-32. Treatment of Pitch in Argon/Hydrogen Plasmas Bogdan Z. Dlugogorski,t Dimitrios Berk,* and Richard J. Munz Department zyxwvutsrqp of Chemical Engineering, McGill University, Montreal, Quebec, Canada H3A 2A7 Pitch-like vacuum-distilled residue from the CANMET coprocessing process was treated in a sta- tionary particle reactor with argon/hydrogen plasmas. The production of light, unsaturated hy- drocarbons was optimized as a function of the average p h a temperature, composition, and residence time. The unconverted residue was characterized in terms of ita elemental and mineralogical content. In pure argon plasma, the conversion to acetylene was about 14% and did not vary appreciably with temperature; other hydrocarbons were detected only in trace quantities. In argon/ hydrogen plasmas the maximum conversion to acetylene and ethylene (25%) was attained between 2900 and 3400 K. Large quantities of soot were produced, but no liquid hydrocarbons were detected. Sulfur was fixed in the unconverted residue by the reduction of calcium sulfate to calcium sulfide. Introduction Canada and the United States possess some of the world's most important deposita of coal and heavy oils. Present address: Department of Chemical Engineering, &ole Polytechnique, Montreal, Quebec, Canada. 0888-5885/92/2631-0818$Q3.00/Q The Canada Centre for Mineral and Energy Technology (CANMET) is currently developing a process to transform these into lighter petroleum products, such as C1-CI gases, naphtha, and light and heavy gas oil. The main concept of this process is to mix finely ground coal particles with the heavy oil and an additive (functioning as a catalyst) and then to hydrogenate the resulting mixture. A major 0 1992 American Chemical Society