NEW PRODUCTS Chemicals and Materials
SUBMICRON FILTER MEDIUM A unique new submicron filter medium, Cox M-780, greatly extends throughput in productionT olume microfiltration for industry. Other advantages are reduced filtration time, increased loading capacity, easy replacement, and a wide temperature range. Developed by Cox Instrument, Dilision of Lynch Corp., Detroit, Mich., the M-780 filter medium, while readily interchangeable with film-type filters without modification to existing filter housings, offers as much as eight to ten times the throughput of film-type membrane filters. T h e M-780 medium represents a n entirely new concept in high-volLime microfiltration. At 780, it is approximately six times the thickness of film-type filters. M-780 has a complex inner pore structure which routes any fluid through a mare containing many thousands of ever-narrowing vertical and horizontal flow paths. Film-type filters, on the other hand, act somewhat as a “screen” to trap contaminants principally on their upstream surface. Tl‘ith the M-780 filter, contaminants are captured, not only on the surface, or a t the rated pore-size level, but throughout the entire filter matrix. Loading capacity is \ astly increased, and throughput is extended many times beyond the point where other filters fail through clogging. T h e design of the M-780 eliminates the prefilter stage often needed lvith film-type media to keep larger contaminants from causing premature clogging. Actual filtration time, particularly with highly viscous or proteinaceous materials, is greatly reduced. I n the period that the M-780 medium has been available for test purposes, numerous instances of time savings from 60% to 90% have been demonstrated. I n one case, a medical laboratory 84
shortened the time required for sterile filtration from 4 h r to 17 min through the switch to Cox M-780 medium. Time-saving is closely related to pressure drop in the filter. T h e complex structure of ever-narrowing flow paths effectively traps contaminants, yet permits the free flow of liquid or gas with minimum pressure drop, resulting in important process savings. M-780 disks require none of the extreme care in handling that is characteristic of working with filmtype submicron filters. No soaking is necessary before installation. It’s about as easy to stack M-780 filters onto their associated support plates as to deal playing cards from a deck. This physical strength and ease of handling add considerable timesavings to the over-all process cost profile. Whether used in conjunction with Cox filter housings or as a straight replacement medium in competitive membrane filter holders, M-780 disks enable normal pro-
duction to proceed with minimum shutdown time for replacement and sterilizing of filters. With a 30- or 45-plate filter enclosure, the downtime saving is dramatic, often i n the range of 70y0to SOYo. T h e thermal stability of M-780 permits easy sterilization and sustained high-temperature operation. It can be stored without elaborate fire precautions and can withstand sterilizing and operating teniperatures (from cryogenic to 400°F) far beyond the limitations of cellulosic arid other organic membranes. No problems are incurred by sterilization on-line in live steam or by autoclaving in dry heat or ethylene oxide. T h e inert porous ingredients of M-780 are sealed in a rugged, flameresistant binder. Maximum service temperature is limited more by the housing seals than by the filter medium itself. Process cost is further affected by the all-purpose nature of the M-780 filter. There is n o need to stock one grade of filter for its resistance
T w o commonly w e d disk sizes of submicron filter medium, M-780
INDUSTRIAL AND ENGINEERING C H E M I S T R Y
to alcohol, another for its ability to withstand overnight autoclaving, a n d another for its compatibility with hydrocarbons. M-780 meets the severest requirements of almost any production-volume submicron filtration application. And, since shelf life of M-780 filter disks is unlimited, the user can take advantage of the convenience and savings inherent i n quantity purchasing. T h e Cox M-780 filter medium is available in all standard sizes, with and without a center hole, in maximum pore sizes of 0.20, 0.45, 0.65, 0.80, 1, 2, 5, and 10., Lynch Corp. 20 1 DRY ICE PELLETS
These pellets are an economical replacement in manufacturing applications requiring Dry Ice processing. T h e pellets can lower labor costs because they come i n ready-touse form and require n o special handling. Because the pellets are discrete particles and of uniform diameter, they can be accurately measured and metered. They are available i n 3000-lb box loads and in bagged quantities from J4-in.to 1-in. diameter and random lengths. Chemetron Corp. 202 LIQUID ANTIFOAM AGENT
T h e product, called Nuodex AF-100, is a nonsilicone a n d reportedly has excellent uniformity (will not separate on aging), as well as heat and cold stability. T h e agent for latex paint demonstrates a superior resistance to bubble buildup during paint manufacturing. Tenneco Chemicals, Inc. 203 LUBRICANT ADDITIVE
An entirely new additive has been introduced to increase the lubricity of conventional materials. T h e product provides a film which relieves surface-to-surface contact of moving parts. Bearing compound is made with Liquilon, which is inert and unaffected by acids, oil, caustics, alcohols, and common solvents. Oil Center Research, Inc. 204
M o r e information i s as near as your mailbox. Just circle the number of the item in which you are interested on the Readers’ Information Card.
LITERATURE
Graphite Filament Packing. A 4-page brochure describes service problems solved by Garfite 100. Characteristics of the packing are described as revolutionary for uses in the chemical, petrochemical, petroleum refining, and other industries. Advantages that are offered include long service, reduction of installation and maintenance costs, and elimination of product loss. Garlock, 205 Inc. Industrial Gypsum. A 16-pagebooklet, called “Densite/Denscal Gypsum Cement Industrial Tooling Techniques,” covers topics ranging from pouring, screeding, and splash casting to basic forming methods, physical properties, pattern preparation, mixing, pouring, pattern removal, straight-run molding, circular molding, and reinforcement. 206 Georgia-Pacific Corp. Crystals. A new 1968 cataIog listing over 100 different single crystals is available. Among the new items added are zirconium crystals and alloys, zinc oxide, magnesium oxide, proustite, and silicon monoxide powder. The catalog includes a section of semiconductor materials including group 111-V and 11-VI compounds. Ventron Electronics Corp. 207 Metallurgical Products. A 9-page list of products is available. Included is a description or grade of the product, yo typical composition and application. Information concerning packaging and product description will be furnished upon request. Chemical and mineral products are described in a separate publication. Foote Mineral Co. 208 Fundamentals of Polymerization. An article in Or-Chem Topics, a quarterly technical publication is available (No. 24) from Rohm and Haas Co. The article discusses the kinetics of free radical polymerization in basic, readily understood terms and develops a definition of the initial role of polymerization for acrylic polymeric products in bulk or solution processes. Rohm and 209 Haas Co. Extrusion of ABS. A technical bulletin covering extrusion equipment procedures for Cycoloy ABS-polycarbonate alloy and Cycolac ABS. The bulletin, PB-117, explains that because of basic differences in chemical composition and physical properties, extrusion techniques required to obtain high quality sheet with Cycolac and Cycoloy resins are somewhat different from other thermoplastics. BorgPVarner Corp. 210
New and profitable uses are being found for a special class of complexi n g agents t h a t effectively c o n t r o l trace m e t a l - i o n reactions i n aqueous solutions. Commonly called chelating agents, identical products are offered under a variety of different and often confusi n g trade names. To assist in clearing u p t h e confusion and to help m a k e comparisons easy, Cowles has prepared a brochure that lists leading m a n u facturers’ products and chemical equivalents. T h i s b r o c h u r e a Is0 contains a g r a p h i c p r e s e n t a t i o n that illustrates distinguishing characteristics of chel a t i o n a n d sequestration. If you would like a copy, write today for Cowles chelating agent comparison brochure.
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