By E. Rabald (Auth.)
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Additional resources for Corrosion Guide
Storage and transportation tanks (I). Acetylation apparatus for cellulose acetate, pipelines, centrifuges for moist (acid and anhydride) cellulose acetate (Π). At 700 °C vapours are catalytically decomposed. + 132 °C, strong agitation, 98% acetic anhydride + 2% acetic acid + potassium permanganate (II). , 50% acetic anhydride -f- 50% acetic acid, rapid agitation. 023 mm/year. (+) 640 °C, pressure 15 psig, 40% acetic anhydride + 36% acetic acid + 20% water. S. type 316). p. Pumps, valves. + 70 °C, rapid agitation, 65% acetic anhydride + 35% acetic acid: steel with 29% Ni, 20% Cr, 3% Cu, 2% Mo.
At 300 °C catalytic decomposition of vapours of acetic acid. , vinegar and other kinds of acetic acid by fermentation: Inconel. , pure 80% acetic acid. Corrosion rate: 1 mm/year (Inconel). Monel metal + 20 °C, all concentrations. Corrosion rates: in presence of little air, about 2 g/m per day; strong ventilation and stirring, about 5-15 g/m per day (the greatest attack with 80% acid). p. 6 g/m per day; in 26%, 11 g/m per day; in 56%, 14 g/m per day; in 90%, 15 g/m per day. : 2 Concn. 2 Boilers, pipes, fittings.
7 g/m per day (III). — 120 °C, mixtures of 5% acetic acid and 10% sulphuric acid (II). 5-98%. Corrosion rate: 15-60 g/m per day, when air is excluded. e. by stirring and oxygen to 5000 g/m per day in the case of glacial acetic acid. 2 2 Nickel + Corrosion is dependent on the presence of air and other oxidizing agents. Corrosion rates in 1-100% acid: Temp. p. , little air (pure acid): 2 Concn. 4 Boilers for hydrogénation in acetic acid solutions (also by pressure), centrifugal cups, fittings. Corrosion is diminished by the addition of small quantities of mercuric sulphate.
Corrosion Guide by E. Rabald (Auth.)