Energy recovery method and system for combined sulphuric acid an

Details Energy recovery method and system for combined sulphuric acid an Energy recovery method and system for combined sulphuric acid an

1984-04-16

1985-01-22

Straub, Gary P.

Chemistry of inorganic compounds

Treating mixture to obtain metal containing compound

Alkaline earth metal

423320, 423522, 423533, 422161, 159 17R, 159 471, 203 12, C01B 2516, C01B 1798, C01B 1748

Patent

active

044951612

ABSTRACT:
In conventional processes for manufacturing phosphoric acid, sulphuric acid is reacted with phosphate rock to produce weak phosphoric acid which is concentrated using steam from the associated sulphuric acid manufacturing operation. Low grade heat from the absorbers and drier of the sulphuric acid manufacturing plant has been wasted. According to the invention waste heat from the drier and one or more absorbers of the sulphuric acid manufacturing plant is used in all the evaporators of the phosphoric acid plant. The evaporators all operate at low pressures and their heaters are arranged in series, to enable the heat to be used at the relatively low temperatures available. The valuable steam is thus freed for other uses.

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Olsen, John C., Unit Processes and Principles of Chemical Engineering, D Van Nostrand Co. Inc., New York, N.Y, 1932, pp. 1-3.
CPI Firms Map Strategy for Energy-Saving Plans Chemical Engineering, Nov. 7, 1977, pp. 49-51.
Sander et al., Waste Heat Recovery In Sulfuric Acid Plants CEP, Mar. 77, pp. 61-64.
Sander et al., Concentration of Dilute Sulfuric Acid and Phosphoric Acid with Waste Heat, Proceedings of British Sulfur Corp. 5th International Conf. Part II, London, Nov. 16-18, 1981, pp. 440-458.

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