C - Chemistry – Metallurgy – 23 – G
Patent
C - Chemistry, Metallurgy
23
G
149/5
C23G 1/02 (2006.01) B09C 1/02 (2006.01) C02F 5/08 (2006.01) C02F 5/10 (2006.01) C02F 5/12 (2006.01) C09K 8/528 (2006.01) E02D 3/00 (2006.01) E21B 43/28 (2006.01) G21F 9/00 (2006.01)
Patent
CA 2030535
Surface layers of the earth contaminated with precipitates of alkaline earth metal sulfates including radium sulfate derived from subterranean waters brought to the surface of the earth, are decontaminated using an aqueous chemical composition including a polyaminopolycarboxylic acid such as ETDA or DTFA in combination with a synergist, preferably oxalate or monocarboxylic acid anion such as salicylate. The surface layers may be decontaminated in situ by applying the solvent to the earth to bring the precipitates into dissolved form after which the dissolved precipitates are leached into lower layers of the earth by percolation with water. Alternatively, the earth may be removed from its original site and decontaminated in a tank or lined pond after which the decontaminated earth may be returned to its approximate original site. There is also disclosed a method of decontaminating natural gas processing equipment using the aqueous chemical composition.
Un premier composant d'une substance fluide est exprimé d'une cartouche (C) pouvant être vidée au moyen d'une presse. Le composant principal s'écoule dans le conduit d'amenée (8) jusqu'au conduit de décharge (11), mettant en rotation deux rotors (31) montés dans la chambre de dosage (9) à l'intérieur du boîtier (1). Des pignons montés sur les arbres (30) des rotors (31) s'engrènent et forment ainsi une pompe à engrenages (24). La pompe à engrenages (24) refoule par un conduit de refoulement un composant à mélanger contenu dans un récipient intégré (18), jusqu'au conduit de décharge (11). Ce chapeau doseur permet de mélanger au moins deux composants dans des proportions extrêmement précises.
Morris Richard L.
Paul James M.
Wilson Peggy M.
Gowling Lafleur Henderson Llp
Mobil Oil Corporation
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