LETTERS
Fortunately, there’s CAIROX’ Potassium Permanganate ~aaea to ne water of a gas 8Cr‘UDtx?ror au wasner, GAIKUX uesnoys the odorcausing or toxic molecules in the air stream. It doesn’t merely maak or neutralize the odor. Carus Chemical Company spent years perfecting the technique that now make8 it easy and economical for industry to direct the powerful oxidizing power of potassium permanganate against a wide variety of noxious gases. How completely doea CAIROX clean the air of odor pollutants? The following results from laboratory teats,using the actual waste gases from plant process equipment, show threshold odor redudion (ASTM D139157) after a l - s e m d wash with a CAIROX treatment. CHEMIUL MANUFACTURER; Effluent from the absorlmr of a dibasic acid anhydrida -Contaminants a n lachrymators. primarily aldehydes. Thnahold odor reduced 94%.
PErROLEUU REFINER Effluent from uphalt blowing opntion -Contaminants a n m e r u w n s and other sulfur compounds. Threshold odor n d u d 99%. PHARMACEUTICAL MANUFACTURER%Emuent fmm hrmentatlon vats. Threshold odor m d u d 100%. CONTAINER MANWACWRERI Effluent from wlnt curing owns. Contaminants a n a mlxhlm of resins. Threshold odor d u d 90%. PAPER MANUFACTURER8 Effluent from pulp digester. Contomlruntr a n sulfides. Threshold odor Mused 99%.
Can CAlROX help you? For full &Mils, write for File 1032 1375 EIGHTH STREET
CARUS C H E M 1CA L COMPANYING
LA SALLE, ILLINOIS
(815) 223-1500
I N OUR FIFTY-FIRST YEAR OF SERVICE TO YOU cirtl8 Ma. I am ndm‘ &niu C I ~ 16
I N D U S T R I A L A N D ENGIHEERING CHEMISTRY
I
Sir: Your November issue of I&EC again contains a review article by J. Palumo and K. H. Lin on Crystallization. Dr. Palerrno has done an extraordinary job on reviewing and reporting on the literature. T o report on in excea8 of 800 references involves the searching out of far more than that number. This review, as well as many others that have appeared in I&EC over the years, represents many hours of tedious work by reviewers and those who help the authors. The reviews represent a real and lasting contribution to the chemical engineering literature. Where else can you be brought up to date so readily in a field of interest? As a long standing reader of I&EC, I would like to express my thanks to you for continuing to publish the reviews and above all to the many reviewers who have given of their time and effort. Herbert M. Sehoen Tarrytown, N. Y. Sir: I read with much interest and general agreement your report in the October issue, “DATA-Needs, Evpluation, and Dissemination.” Hawever, two statements raised my eyebrows. One was that projects to fiu data gaps may be a mistake and the other was the “inevitable viscosity of government.” I hope that you differentiate between filling data gaps “because they are there” and those brought to light because of needs. To me the most inviting areas of work are those where usage has cast doubts on the accuracy or where needs to extrapolate call for additional data. The viscosity of government should be recognized as a function of bigness as well as lack of profit motive. A governmentaldata center which must serve the entire technological area cannot have the mobility of a two-man operation specializing in infrared spectra of hydrocarbons. I sincerely believe that science can be served within the Government. John S. Ball Bartlesville, Okla.
