Storage alloys

Precaution Avoid contact with aluminum or It. alloys Storage 1 yr shelf life DVB 55 [Dow]... 

While benchtop instruments can use pressurized tanks as the hydrogen source, carrying pressurized hydrogen is very inconvenient in field apphcations, and many believe tanks in the field present a major safety hazard. Alternatively, small hydrogen alloy storage devices that contain reasonable amounts of hydrogen (in the form of a metal hydride) are available, and these can be used safely in the field. 

CH3 CO O C0H4COOH. In the production of ace-tylsalicylic acid, the raw materials, acetic anhydride and salicylic acid, and the final product have been handled in aluminum alloy storage tanks, piping and reaction vessels. See also Ref (2) p. 26, (3) p. 130, (5) p. 9. (7) p. 7,... 

BUTYL ACETATE CH,COO(CH KCH.v In laboratory tests, alloy 3003 was resistant to butyl acetate at ambient temperature and at the boiling point. Under refluxing conditions, butyl acetate caused mild attack ( 3 mpy) of 3003 alloy. Aluminum alloy storage tanks have been used for butyl acetate. See also Ref (Dp. 128. (2) p. 118. (3) p. 136. (7) p. 39. 

BUTYRIC ANHYDRIDE. [CH3 (CHjljCOjjO. In laboratory tests, butyric anhydride and mixtures of butyric anhydride and butyric acid at temperatures from ambient to boiling caused moderate attack ( - 7 mpy) of 1100 alloy. In the same tests, a mixture of dehydrated butyric acid and commercial strength anhydride was corrosive to 1100 alloy. Aluminum alloy storage tanks and shipping drums have been... 

FATTY ACIDS. RCOOH. Laboratory tests have shown that fatty acids cause mild attack of 1100 alloy at ambient temperature. Anhydrous fatty acids were found to be veiy corrosive to aluminum alloys at the boiling point in other laboratoty tests. Aluminum alloy storage tanks, separators, settling and receiving tanks, condensers, vapor lines, and steam trace lines have been used to process and handle fatty acids and fatty acid derivatives. See also Ref (1) p. 132, (2) p. 274, (3) pp. 125, 127, (4) pp. 25, 100, (7) p. 93. 

PROPIONIC ANHYDRIDE. (CHjCHiCOIA I" laboratory tests, 1100 alloy was resistant to propionic anhydride at ambient temperature and at 50 C (122°F). At the boiling point, propionic anhydride was very corrosive. Propionic anhydride has been handled in aluminum alloy storage tanks, drums and tank ears. See also Ref (3) p. 128. 

ANSI B96.1. American National Standard for welded aluminum-alloy storage tanks. 

American National Standard for Welded Aluminum-Alloy Storage Tanks, ANSI B96.1-1981, American National Standards Institute, New York, 1981. 

Faron Lyons (212) 591-8540 B96 Welded Aluminum Alloy Storage Tanks Committee... 

Its alloys include solder, type metal, and various antifriction metals. Great quantities of lead, both as the metal and as the dioxide, are used in storage batteries. Much metal also goes into cable covering, plumbing, ammunition, and in the manufacture of lead tetraethyl. 

Hydrogen separation Hydrogen storage Hydrogen-storage alloys Hydrogen sulfide... 

Hie common acrylic ester monomers are combustible liquids. Commercially, acrylic monomers are shipped with DOT red labels in bulk quantities, tank cars, or tank tmcks. Mild steel is the usual material of choice for the constmction of bulk storage facilities for acrylic monomers. Moisture must be excluded to avoid msting of the tanks and contamination of the monomers. Copper or copper alloys must not be allowed to contact acrylic monomers intended for use in polymerization because copper is an inhibitor (67). 

Hydrogen-storage alloys (18,19) are commercially available from several companies in the United States, Japan, and Europe. A commercial use has been developed in rechargeable nickel—metal hydride batteries which are superior to nickel—cadmium batteries by virtue of improved capacity and elimination of the toxic metal cadmium (see BATTERIES, SECONDARYCELLS-ALKALINe). Other uses are expected to develop in nonpolluting internal combustion engines and fuel cells (qv), heat pumps and refrigerators, and electric utility peak-load shaving. 

Storage as Hydrides. The discovery of metal compounds that reversibly absorb hydrogen is relatively recent. In the 1970s, the AB and AB family of alloys, which reversibly absorb hydrogen at room temperature and low pressure, were identified (205). Both A and B are metals. As of this writing many such compounds are known LaNi and TiFe are examples. 

One of the problems with early hydride systems was decrepitation of the alloy. Each time the metal hydride storage tank was recharged the particles would break down and eventually the particles became so small that they began to pass through the 5-p.m sintered metal filter which kept the hydride inside the tank. Addition of 0.5% manganese, which caused the decrepitation process to cease once the particles reached a size of about 10 p.m, solved this problem. 

The lanthanides can form hydrides (qv) of any composition up to LnH. Lanthanide hydrides can desorb hydrogen reversibly with temperature. Therefore, the lanthanides and some of thek alloys ate good candidates for hydrogen (qv) storage, of which LaNi is probably the most promising (see... 

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