C - Chemistry – Metallurgy – 01 – B
Patent
C - Chemistry, Metallurgy
01
B
23/384, 23/76
C01B 25/222 (2006.01) B01J 8/00 (2006.01) C01B 17/765 (2006.01) C01B 25/234 (2006.01)
Patent
CA 1146722
ABSTRACT OF THE DISCLOSURE In conventional processes for manufacturing phosphoric acid, suplhuric 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 beer. 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 avail- able. The valuable steam is thus freed for other uses.
375178
Cameron Gordon M.
Orlando John V.
Barlow Charles Brian
Chemetics International Ltd.
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