T h e Swenson D T B (draft tube baffle) crystallizer reflects both the recent trend toward e q u i p m e n t to make large uniform crystals a n d the broad background of Swenson's decades of crystallizer experience. Better understanding of the causes of wall salting has focused attention on the control of slurry densities, and the D T B is one of the latest designs providing for control of this variable. Already proved in over a dozen plants, this unit is designed to make crystals with superior filtration, centrifugation, washing, drying, a n d storage- characteristics. It can be built of most all corrosion resistant materials. Swenson maintains a fully equipped pilot plant unit to demonstrate performance of the D T B crystallizer a n d do test work aimed at solving your individual crystallizer problems. M o r e and more chemical producers are buying packaged plant units rather t h a n purchasing individual e q u i p m e n t items for in-plant assembly. Paul O. Abbe, already offering a complete line of v a c u u m drying and blending equipment, now puts together a completely-packaged R o t a - C o n e v a c u u m dryer—including heating, solvent recovery, and v a c u u m systems, a n internal agitator, and facilities for adding liquids in a n atomized spray. Bowen Engineering has designed a n d installed a n u m b e r of closed cycle spray drying systems in which the drying m e d i u m is recycled. This type system is particularly useful where the solvent in the feed must be recovered. Interest in these processes has picked u p in recent months, a n d Bowen designed a packaged laboratory system—with all necessary e q u i p m e n t , piping, wiring, ductwork, a n d controls. Test work can be carried out on systems where superheated solvent itself is the drying m e d i u m or where some other m e d i u m , such as a n inert gas, is used. Bowen has offered custom built systems of this type for some time, but believes that this is the only closed cycle packaged laboratory spray drying system available. T h e stacked-hcarth kiln, a new concept of the multiple-hearth furnace, is introduced in a five-foot-diameter, seven-foot-high pilot unit by (Continued on page 72 A)
BUY KOWTRANSMIT LATER The Brooks Full-View* rotameter has a remarkable ability to adapt to changes in process requirements. With the addition of a float extension and a Brooks Series MPT unit, it can become a pneumatic or electric transmitter. Or, just as easily (and economically), a high-low flow alarm. Or a flow totalizer. Or a combination of any of these. When used as a simple flow indicator, the Full-View offers another kind of adaptability. Suppose there's a change in capacity requirements after installation. No problem. Just by turning the float head around you can increase or decrease the flow range anywhere from 2 5 % to 3 3 % . Substitute a heavier or
lighter float body, and you can raise or lower capacity a full 1 0 0 % . Without disturbing calibration. And you can do the job in a matter of minutes. The Full-View's side-plate, dowel-pin construction eliminates all alignment difficulties. It also makes the meter exceptionally rugged. And easy to maintain. In fact, it is probably the most sensible rotameter construction going. Why else would most of the " n e w " meter designs you see around be derivative of this idea, which Brooks developed fifteen years ago? Our Bulletin 115 will give you technical data on the complete Full-View line. A word from you will put a copy in the mail.
BROOKS INSTRUMENT COMPANY, INC. 5 6 1 1 W. Vine Street, Hatfield, Pa. TM
SA-2499
VISIT BOOTH NO. 998 — 28TH EXPOSITION OF CHEMICAL INDUSTRIES Circle No. 35 on Readers' Service Card VOL. 53, NO. IT
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NOVEMBER 1961
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