Corrosionom Fansteel
Diether Lubricants Designated as the D L B Series, new materials are diethers and have no terminal hydroxy group. Dif ferent structure from conventional polyalkylene alcohols imparts im proved viscosity-temperature char acteristics and complete solubility in hydrocarbons. Absence of func tionally active groups also reduces chemical activity. Suggested uses are in manufacture of lubricants. Dept. IEC, Union Carbide Chemi cals Co., 30 East 42nd St., Neiu York 17, Ν. Υ. 32
Polyester Fiber Kodel is a new superior polyester fiber. Outstanding properties in clude: resistance to piling and to heat, dimensional stability, greater covering power, and ability to dye easily. Dept. IEC, Eastman Chem ical Products, Inc., 260 Madison Ave., New York 16, Ν. Υ. 33
Encapsulating Resin A new silicone-modified encap sulating resin has been developed. Fosterite S F R BT-3199 is designed for use in treating electronic com ponents t h a t require high moisture resistance and flame retardance. Dept. IEC, Micarta Division! Benolite Plant, Westinghouse Electric Corp., Manor, Pa. 34
REGISTERED
U.S.
PATENT
TANTALUM HEAT EXCHANGER SOLVES HIGH TEMPERATURE HNO3 PROBLEM Commercial Solvent's plant at Sterlington, La., produces flake ammonium nitrate by neutralizing nitric acid with anhydrous ammonia. The reaction takes place at 400-460°F., driving off water introduced with the acid. Λ key piece of equipment in this operation is a Fansteel tantalum heat exchanger which has been giving outstanding service with no visible corrosion noted over a number of years. H a n d l e s H N O 3 at 45 G a l / M i n This Fansteel equipment handles up to 45 gal/min at elevated tempera tures with a heat transfer coefficient greater than 550 Btu/hr/sq ft/°F. It is made of three 8-ft. sections in series. If one unit must be removed the other two may be coupled and run at re duced flow. Each unit consists of a bundle of 19 straight tantalum tubes, Vz" O . D . and with a 0.015" wall. This gives 20 square feet of heat transfer surface for each section.
Corrosion Rate N i l in H N O 3 Montecatini, the huge Italian chem ical company in Milan, exposed tan talum to 9 8 % H N O 3 containing 0 . 1 % H2SO4, 0.4% nitrogen oxides and 1.5% H2O at 132°C for 762 hours. The corrosion rate was 0.00002 inches per year and the metal was unchanged in appearance. Tests by other com panies confirm the low corrosion rates of HNO3 in all concentrations even at elevated temperatures—as high as 200°C. "U" T u b e Bundles A l s o Available Fansteel heat exchangers are also available with " U " tube bundles where processing or physical require ments call for a unit with input and output at the same end. No internal gaskets are used, which makes the leakage problem nonexistent. Teflon * grommets support each tube in the baffle holes and permit free move ment, thereby eliminating the differ- . cntial expansion problem. Tantalum Also Resistant to Concentrated H2SO4 and H3PO4
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Acrylic Solution for Auto Lacquers Acryloid A-21 is a clear, color less, rapidly drying, hard, polymer solution developed for the automo tive industry. I t is said to have application to industries where ad hesion t o other surfaces is a prob lem. Dept. IEC, Resinous Prod ucts Division, Rohm & Haas Co., Washington Square, Philadelphia 4, Pa. 35
JJwJL.ore information is as near as your m a i l b o x ! Just circle the number o f the item in which y o u a r e interested on the Readers' Infor mation C a r d , preceding this section.
O F F I C E
A JOURNAL OF USEFUL I N F O R M A T I O N FOR THE S O L U T I O N OF CORROSION PROBLEMS
TEMPERATURE DECREES C
Free Tantalum Test Kit A corrosion test kit, available without charge to research technicians, if re quested on your letterhead; contains both tantalum sheet and wire. Free Technical Information
Shown without lagging, threersection tantalum heat exchanger raises nitric acid temperature to 330°F. * Registered trade mark, E. 1. duPont deffemours & Co., Inc.
T h e above condensation is typi cal of the articles which appear in CORROSIONOMICS, a Fansteel publication. Mail us your name for i n c l u s i o n on o u r free mailing list.
For further data on the above, write:
G584A
FANSTEEL METALLURGICAL C O R P O R A T I O N CHEMICAL
EQUIPMENT
: NORTH
DIVISION
.:... v.:
CHICAGO, ILLINOIS,
U.S.A.
Circle No. S3 on Readers' Service Card VOL. 5 1 , NO. 2
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FEBRUARY 1959
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