Detail of "7631-94-9"

CAS Number:
7631-94-9
Name:
Dithionic acid, sodiumsalt (1:2)
Molecular Structure:
Formula:
H₂NaO₆S₂
Molecular Weight:
185.132
Synonyms:
Dithionicacid, disodium salt (8CI,9CI);Sodium dithionate (6CI,7CI);Disodiumdithionate;Sodium hyposulfate;Sodium sulfate (Na2S2O6);
EINECS:
231-550-1
Appearance:
solid

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Nondispersed aqueous drilling fluid containing additive for removing oxygen and impeding corrosion: Nondispersed aqueous drilling fluid containing additive for removing oxygen and impeding corrosion. Carney, Leroy Lloyd; Watson, Jimmie Lee (Halliburton Co., USA). Braz. Pedido PI BR 7504775 31 Aug 1976, 28 pp. (Portuguese). (Brazil). CODEN: BPXXDX. CLASS: IC: C23F011-08. PRIORITY: US 74-518306 29 Oct 1974. DOCUMENT TYPE: Patent CA Section: 51 (Fossil Fuels, Derivatives, and Related Products) A mixt. of Na2S2O4 [7775-14-6] and Na2S2O6 [7631-94-9] was added to an aq. drilling mud contg. Na montmorillonite, a carboxylated polymer, and NaCl to remove dissolved O and prevent the corrosion of metal surfaces of drilling equipment caused by O. Thus, 350 g of a Na2S2O4-Na2S2O6 mixt. was dissolved in 294 g diesel oil and 10 g oleophilic clay was added. An aq. soln. was prepd. contg. Wyoming bentonite 4.54, a maleic anhydride-vinyl acetate copolymer [9011-07-8] 0.227, and NaCl 5.45 kg/159 L, and this aq. fluid contained 6.3 ppm dissolved O at 23°. The O-removing additive mixt. was added at 45.4 g/159 L to the aq. soln. at 22.9°, and the O content was immediately reduced from 6.3 to 2.0 and after 5 min to 0.75 ppm.

Solution for regenerating water wells: Solution for regenerating water wells. Alekseev, V. S.; Grebennikov, V. T.; Andreev, K. N. (All-Union Scientific-Research Institute for Water Supply, Sewage Systems, and Hydraulic Installations, USSR). U.S.S.R. SU 1117287 A1 7 Oct 1984 From: Otkrytiya, Izobret. 1984, (37), 67. (Russian). (Union of Soviet Socialist Republics). CODEN: URXXAF. CLASS: IC: C02F005-04; E21B043-25. APPLICATION: SU 83-3609496 28 Jun 1983. DOCUMENT TYPE: Patent CA Section: 61 (Water) The soln. ensuring increased degree of dissoln. of ferruginous deposits contains 8-10 wt.% rongalite [149-44-0] in addn. to 6-8 Na dithionate [7631-94-9], 0.3-0.5 wt.% Na hexametaphosphate [10124-56-8], the balance being H2O.