Detail of "10588-01-9"

Reference

Method and composition for acidizing subterranean formations

Method and composition for acidizing subterranean formations. Swanson, Billy L. (Phillips Petroleum Co., USA). U.S. US 4055502 25 Oct 1977, 16 pp. (English). (United States of America). CODEN: USXXAM. CLASS: IC: E21B043-27. NCL: 252008550C. APPLICATION: US 75-643984 24 Dec 1975. DOCUMENT TYPE: Patent CA Section: 51 (Fossil Fuels, Derivatives, and Related Products) Section cross-reference(s): 37 Subterranean petroleum formations are subjected to either matrix acidizing or fracture acidizing by the use of gelled acidic compns. contg. water, a water-dispersible acrylamide polymer or copolymer, and a flavotannin gelling agent. The compns. may also contain a gelation promoter (e.g., Na2Cr2O7). Thus, 1 g quebracho was dispersed in 250 mL of a 0.5 wt.% aq. soln. of a com. hydrolyzed polyacrylamide (6.3% degree of hydrolysis), the soln. was warmed to 130°F, and 64 mL concd. HCl was added. A portion of the soln. was subjected to a test tube thermometer test in which the effect of temp. on the viscosity was obsd. qual. At 200°F a significant increase in viscosity was obsd., and this was considered evidence of gelation. When the HCl soln. used also contained 5 mL of a 10 wt.% aq. soln. of Na2Cr2O7.2H2O [10588-01-9], the gelation of the polymer soln. occurred at 130°F and the gel was stable for several min at >200°F. It was concluded that such compns. can be used in acidizing operations in wells having depths of at least 10,000 ft and at formation temps. of at least 200°F.

Coloring of stainless steel by chemical oxidation

Coloring of stainless steel by chemical oxidation. Moriyama, Toshio (Tokyo Metal Art Sangyo K. K., Japan). Japan. Kokai JP 52005634 17 Jan 1977 Showa, 4 pp. (Japanese). (Japan). CODEN: JKXXAF. CLASS: IC: C25D011-38. APPLICATION: JP 75-81531 2 Jul 1975. DOCUMENT TYPE: Patent CA Section: 55 (Ferrous Metals and Alloys) Stainless steels are treated in an aq. soln. contg. Cr6+ and H2SO4 to form visible oxide films on the surface and electrolyzed in a coloring bath. The degree of coloring can be controlled by the electrolysis time. Thus, a 15-mm-thick stainless steel plate SUS 304 [11109-50-5] was treated in an oxidn. bath contg. CrO3 [1333-82-0] 20, Na2Cr2O7 [10588-01-9] 60 g/L, and 50% H2SO4 [7664-93-9] 1 L at 95.degree. for 15 min and electrolyzed in a coloring bath contg. CrO3 10, Na2Cr2O7 50, KMnO4 [7722-64-7] 0.2 g/L, and 35% H2SO4 1 L at 50.degree. and 0.3 A/dm2 for 30-60 min. The plate color was dark brown, blackish brown, or black when electrolyzed for 30, 45, and 60 min, resp.In this experiment, several chemicals are used like 1333-82-0 and 7664-93-9 The colored plate had excellent corrosion resistance; no corrosion was obsd. on spraying brine soln. for 1000 h. .