I&EC REPORTS
solve DYFo-Drocessinu Droblems Catalyst in Fused Salts The potential of fused salts as catalysts has intrigued chemists for many years. Fused solids, especially ionic salts, usually have high thermal conductivity which permits very close control of reaction temperatures in highly exothermic reactions such as hydrocarbon chlorinations. I n addition, catalytically active melts remain active and are not usually miscible with reactants and products. Despite the possibilities and the issuance of about 20 patents describing 41 elements as fused catalysts, the actual number of industrial applications of fused catalysts is very small. I n an extensive review of fused salts, W. Sundermeyer [Angezo. Chem (Intern. Ed.) 4 (3), 222 (1965)] cites only four process patents issued since 1950. Dr. Sundermeyer suggests, however, that this may be misleading and indicates that we may be entering an era of revived interest in ionic liquids, Le., fused salts as media for conducting sensitive reactions. From the industrial viewpoint one of the more interesting reactions is the Friedel-Crafts synthesis in melts containing aluminum chloride catalysts. Although large amounts of tarry products are formed, there is, apparently, some work being done to make the reaction more specific. I
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Corrections A Relative Hazard Classification of Organic Peroxides, by David C. Noller, Stanley J. Mazurowski, Gilbert F. Linden, Frederick .I. G. de Leeuw, and Orville L. Mageli, Ind. Eng. Chem. 56, No. 12, 18-27 (Dec. 1964) : In the description of the Pressure Vessel Test, on page 23 of the above article, it should be noted that this testing instrument was first developed by the Technological Laboratory of the National Defense Research Organization TNO, Delft, The Netherlands. As stated in the article, this tester was then modified by the authors to give more reliable results.
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THE SKINNER MULTIPLE-HEARTH FURNACE is used for treatment of materials from %’ to extreme fine sizes. It is capable of handling a mixture of sizes simultaneously. It provides maximum flexibility. Requires minimum floor space. It is a compact, completely integrated unit, with built-in conveying arrangement, and just one drive. TEST SERVICE. Most pyro-processing problems must be solved through test work. We offer both batch and continuous testing services in our laboratory. Or you may purchase or lease a continuous pilot plant or batch laboratory unit. EXPERIENCE. 70 years of satisfying customers through engineering and manufacturing experience on Skinner Furnaces and other processing equipment.
The Shieldallov- CorDoration ~~
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of Newfield, New Jersey is a prominent producer of metals and ferro-alloys, such as columbium, vanadium, titanium, and ingredients for welding rod coatings.
The Skinner Furnace is essential equipment in the Shieldalloy plant for efficient production of .materials of high quality and purity. Application of the Skinner Furnaces to Shieldalloy’s various requirements was established through experience and test service by Mine and Smelter, in cooperation with the company’s engineers.
Write or call for additional information on the Skinner Furnace, laboratory services, and company capabilities
MINE AND SMELTER SUPPLY CO.
Dept. IE-2 ,3800Race Street, Denver, Colorado 80216 I
Area Code 303 I 244-4353
O n p. 63 of the April issue, scaling up of an isoprene plant was incorrectly attributed to Goodrich-Gulf. Credit for this work should go to GoodyearScientific Design. Circle No. 17 on Readers’ Service Card
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