Method for directly heating concentrated sulfuric acid by electr

Details Method for directly heating concentrated sulfuric acid by electr Method for directly heating concentrated sulfuric acid by electr

1977-12-06

1981-02-17

Bartis, A.

Electric heating

Heating devices

Combined with diverse-type art device

159DIG1, 159DIG19, 204 56R, 204290R, 204292, 219275, 219288, 423531, H05B 360, F22B 130, C01B 1788

Patent

active

042517150

ABSTRACT:
A method is provided for directly heating a concentrated sulphuric-acid solution by passing alternating electric current between surface-passivated electrodes immersed in the solution and by using electrodes of iron or an iron alloy having a low resistance iron or iron alloy inner core covered by an outer high resistance passivating surface layer which are so surface-passivated that the transition resistance between the electrodes and the concentrated sulphuric-acid solution is at least as great as the resistance exerted by the concentrated sulphuric-acid solution.

REFERENCES:
patent: 1419008 (1922-06-01), Baum
patent: 1441610 (1923-01-01), Topp
patent: 1507120 (1924-09-01), Keep et al.
patent: 1610751 (1928-12-01), Dantsizen
patent: 1685210 (1928-09-01), Baum
patent: 1782482 (1930-11-01), Siefert et al.
patent: 2871424 (1959-01-01), Aikman
patent: 3317415 (1967-05-01), Delahunt
patent: 3664929 (1972-05-01), White et al.

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