Products and Processes Piperine Insecticides · Plant researchers at the Boy ce Thompson Institute, Yonkers N. Y., have obtained unusually effective insecticidal compounds employing pipeline and pyrethrins in varying proportions. Interest of the institute in insecticides employing pipeline was stimulated by its studies of black pepper, which contains this ingredient with resin to the extent of 7 to 8%. In teste employing the official Peet-Cïrady chamber method, and ufing the official test insecticide for comparisons, the Boyce Thompson investiga' >r>» found the piperinepyrethrum mixtures to \>e highly toxic to
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that the black pepper alkaloid was more* toxic to flies than pyrethrum, and at concentrations of 10% pipeline killed 75% and pyrethrins 5».1% of flies in the Peet-Grady tests. Used alone, however, its paralyzing action was too slow, arid pyrethrum was found necessary in fly sprays for the required knockdown properties. Pi peri ne, in the form of a pure alkaloid, a white crystalline solid melting at 128° to 129° C , was employed by the Boyce Thompson investigators in the fly spray tests, and has the following formula:
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OLIVER CONTINUOUS VACUUM FILTER Its Versatility Has Already Helped Numerous I n d u s t r i e s Solve T h e i r F i l t r a t i o n P r o b l e m s Its A d a p t a b i l i t y W i l l H e l p Others Solve Theirs O n the opposite page are shows! nine i portant variations of -the standard O l i v e r Continuous Vaeyurn Filter, each d e v e l o p e d t o provide special filtering performance ior certain Industries with ynysyai filtering probferns. Each variation stemmed from the standard O l i v e r Continuous V a c u u m Filter shown at the right and broy^hl o y t originally im 1 9 0 7 , These developments made it possible for the users t© e n j o y the d e c i d e d advantages of continuous vacuum filtration „ „ . the method which all plants should yse if at ell possible. But there's more to ihe story than the adaptab i l i t y o§ the O l i v e r Coreti^uoys Vacuum Filter, important as this is. Th$r& f s the fenyaty of O l i v e r U n i t e d Engineers who can take the hmïc O l i v e r design mé moélîy H m s© many ways. It implies not ©o thorough knowledge of filter design but an understanding of processing and of the p. filtration plays in the many different prs^eesses, Considering ail these developments and the fact that we have numerous pressyre filters, d o n ' t y o u think It w o u l d pay you to bring y o y r filtering problem to Olives- United?
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OLIVER CHEMICAL
O v e r t h ^ y e a r s ^ o r ® than 1 7 , 0 0 0 O l i v e r U n i t e d Filters h s v ^ b^ems i n s t a l l e d t h r o u g h o u t the w © r l d . These sneiydc cerêtifèUQias 'VâeyuEti falters^ e©ntsny©^s pressyr@ filters., a n d b s f c h prssssir® filters»
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©LIWEi PBECGAT F l L ï i l (0p^Êi Type)
Designed t o handle products producing thin cakes or sticky, cloth-blinding cakes. First a layer of porous material (preeoat) is formed o n arum, then product to be filtered is f e d into the tank. Cake forms on the surface of the precoat artd is shaved off at discharge point b y traveling knife edge. Fresh filter surface of precoatis presented at aft times for filtration.
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Designed to handle crystalline products such as pm and grainer salt, borax, potash, Epsom salts. Products can be taken down t o bone dryness. Dust loss is negligible and there is little danger c i damaging friable products.
Designed, after much experimentation, especially for the synthetic rubber I n dustry which had a difficult washing apd dewaterasig problem in connection with the handling of coagulated latex. Several score O l i v e r Synrub Filters are elresdy installed.
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FILIEI Type)
Designed to wash or thicker wood pulp. Unicfus feature is centrally located valve inside the drum adjacent to the fiStessections. Filtrat© pssses throyçh tk© ported valve directly into the d?um thence ©ut through isrs@ trunnion. Elimination of long piping and tortyoys turns produces sneeptionally high capacity, unifoïra sb^et @fnd improved washing.
PRODUCTS AND PROCESSES Lucite for Lighting According to the Du Pont Co., a practical wartime use of Lucite methyl methacrylate resin is in a cylindrical transparent housing used with portable fluorescent lighting equipment. Lighting manufacturera say that the lightweight plastic housing· machined from tubes of the clear plastic, provides good light transmission, is practically unbreakable under normal working conditions, and is water- and vaportight—an important advantage over wire guards commonly used with this type of lighting equipment. The fluorescent units are manufactured and distributed by the Commercial Reflector and Manufacturing Co.. Los Angeles.
Chloramine-B Chloramine-B, now commercially available from Wyandotte Chemicals Corp., Wyandotte, Mich., is a member of a group of organic, active-chlorine compounds which came into prominence during World War I as sterilizing agents. The compound, which has a minimum available chlorine content of 27.6%, liberates chlorine slowly in water solution and more rapidly in the presence of acids. In neutral or slightly alkaline solutions it can be used at elevated temperatures without rapid decomposition. This 'ability to liberate chlorine makes the compound a mild oxidising and chlorinating agent.
It is reported safe for use on rayons, cottons, and woolens at the proper pH nnd in the proper concentrations. It should prove useful for the modifying of starch. It is recommended as a deodorising agent for airconditioning units and in mold, slime, and fungi control problems. It is an ' a c t i v e germicidal agent, and a mild bleach.
tially insoluble in water and are very stable to hydrolysis by water. They can yield only neutral produots and oarbon dioxide when hydrolyzed. The properties of these diglycol carbonate esters suggest that they may be used to advantage as plasticiaers, high-boiling solvents, and softening agents, as well as in pharmaceutical and lubricant compositions.
Surface Moisture of Coal Surface moisture content controls such properties of crushed coal as bulk density and angle of repose, and the real measure of accomplishment in drying or dewatering coal in washeries is the reduotion in surface moisture content. A rapid method for determining the surface moisture of coal has been developed by the Bureau of Mines experiment station in Pittsburgh. A measured sample of the coal to he tested is placed in a solvent such as alcohol and the surface moisture is dissolved. The solvent then is filtered from the coal and its moisture content is determined by measuring the dilution of the solvent by its change in spécifie gravity.
Fiberglas Tower Packing Using old equipment not designed for the job, Atlantic Refining Co. engineers were confronted with a serious problem in producing 100-ootane gasoline from oil of high sulfur content. The process involved passing ofl vapor through a catalyst, under pressure. The catalyst chamber is approximately 25 feet high and β feet la diameter. The vapor
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New Organic Ether-Esters Butyl diglycol carbonate, butoxyethyl diglycol carbonate, and phenyl diglycol carbonate are new colorless organic ether-esters of low volatility now available from the Pittsburgh Plate Glass Co. They are substan-
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ocean bed Navy designers provided all the elements for the solution of the problem save the means for retaining the float within the chamber during the test run. This was worked out by the electrochemicals department of the Du Pont Co. in cooperation with the Resistoflex Corp., Belleville, N. J. t which perfected methods of compounding polyvinyl alcohol to produce substances that range from absolute insolubility to complete solubility in water. The disks, formulated to withstand the water pressures which develop as the torpedo passes over the test course, remain intact for a certain time. Should the torpedo sink, the disk dissolves in a predetermined time interval. Disintegration admits water to the cham) er. The water pressure forces the float through the disk. The float then becomes a buoy marking the location of the torpedo.
Temperature Readings...
Ink for Glass To the growing list of special glycerolutilizing inks for glass may be added the products described by J. C. Wilson in Canadian Patent 424,925. According to his specifications, a smooth ink for glass marking consists of: Lampblack, 50 grams Titanium oxide, 10 grams Silver oxide, 3 grams Glycerol, 150 cc. After intimate mixing, the first three ingredients are gradually added to the heated glycerol with stirring, and the resulting mixture is passed through a paint mill.
Primer for M-69's According to the Chemical Warfare Service, a tiny explosive device smaller than a pencil-tip eraser and weighing only a fraction of an ounce, is burning Japan to the ground. The lethal instrument is a primer, the sparkplug of the Army's M-69 incendiary bomb, millions of which are being dropped almost daily on Japan from B-29 Superfortresses. Developed for the Army by ammunition experts of the Western Cartridge Co. division of Olin Industries, Inc., the 209-B primer is a modified version of the one used in shotshells.
Dye from Buckwheat Hulls A ~eport by N. A. Mukoseev [Tek&til. Prom., through Chem. Abalr., 39,815 (1945)] on 9 new dye from buckwheat hulls shows the role played b: glycerol in textile coloring procedures. In this method, buckwheat hulls, cleaned by washing at 40-50° C. in water and boiling for I." *o 20 minutes in two separate waters, were extrajt*>d with a hot alkali solution. The extract was filtered, the filtrate concentrated, and the resulting color resembled that produced by Alizarin Brown K. The color was fast to water and soap at 40° C. and to perspiratic and dry rubbing.
VOLUME
S3, N O . 12 > » -
at one glance ! WITHREADABLE,RELIABLE
WESTON J&hi. THERMOMETERS Readability does i t . . . whether its single or multiple t znperature readings... in dark comers in hard-to-get-at places, or spots laigb overhead... Weston AllMetal Industrial Thermometers are "kind to the eyes'*. Their bold, gaugetype scalers pre quickly and accurately read» even, a distance away. And for accuracy and all-round rug· gedness, too, you can depend on their sturdy, yet Simple, all-metal construction. The only moving pat: is the allmetal temperature-element—-and that is safety enclosed in à'stainless steel stem. Ilnas the high initial accuracy of the WESTON thermometer... within 1% over the entire scale...is maintained over long periods; despite shock, vibration or other severe usage. Literature gladly sent out request... Weston Electrical Instrument Corporation» 660 Frelingfetzysen Ave., Newark 5, N. J.
Weston All Metal J U N E 15, 1 9 4 5
THERMOMETERS 1111
