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Corrosion inhibitor for high density brines

专利摘要

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基本信息

专利类型:
发明专利
申请/专利号:
IL77769
申请日期:
1986-02-03
专利申请人:
陶氏化学公司
分类号:
C23F11/10
发明/设计人:
-
权利要求: -23-*?7769 / 21. A composition for inhibiting the corrosion of ferrous metals in zinc-containing brines comprising a thioglycolate compound and at least one second compound selected from a thiocyanate, a thiourea, or mixtures thereof, wherein the ratio of the 5 thioglycolate compound to the second compound is from 1!10 to 500:1.2. The composition of Claim 1, wherein the ratio of the thioglycolate compound to the second 10 compound is from 1:2 to 15:1.3• The composition of Claim 1, wherein the ! thioglycolate is present in the brine in an amount of from 0.1 to 5.0 percent by weight and the secondA15 compound is present in the brine in an amount of from 0.01 to 1.0 percent by weight.4. The composition of Claim 1, 2 or 3» wherein the thioglycolate is ammonium thioglycolate.5. The composition of any one of the preceding claims, wherein the thiocyanate compound is ammonium thiocyanate.־ 23 ־ 3M65-F77769/26. The composition of Claim 1, wherein said zinc-containing brine has a density of from 1078 to 2756 kg/m^ (9 to 23 pounds per gallon).7. A ferrous metal corrosion inhibiting5 composition for use with a brine solution containing a zinc halide, said brine solution having a density of from 1078 kg/m^ to 2756 kg/m^ and being in contact, with the ferrous metal at a temperature ranging from 37.8°C (100°F) to 260°C (500°F), said corrosion inhibiting 10 composition comprising a thioglyoolate compound, and at least one second compound selected from thiocyanate, a thiourea, or mixtures thereof, wherein the ratio of the thioglyoolate compound to the second compound is from 15 ;1:10 to 500:1.8. The composition of Claim 7, wherein the thioglyoolate is present in the brine solution in an amount of from 0.1 to 5.0 percent by weight and the2q second compound is present in the brine solution in an amount of from 0.01 to 1.0 percent by weight.9. The composition of Claim 7 or 8, wherein ; the zinc halide is selected from zinc chloride, zincbromide, zinc iodide, or mixtures thereof.10. The composition of Claim 7» 8 or 9> including a metal halide selected from calcium chloride, calcium bromide, calcium iodide, magnesium20 chloride, magnesium bromide, magnesium iodide or mixtures thereof.11. The composition of Claim 10, wherein the zinc halide is zinc bromide and the metal halide is calcium bromide.-24- 31,465-F־ 25 ־ 77 7 6 9 fl ־12. The composition of any one of Claims 7 to 11, wherein the thioglycolate compound is ammonium thioglycolate and the thiocyanate is ammonium thiocyanate.5 13• A method for inhibiting the corrosion offerrous metals in a brine solution at a temperature ranging from 37.8°C to 260°C (100°F tc* 500oF), said brine solution containing a zinc halide and a corrosion inhibitor, said corrosion inhibitor comprising a 10 thioglycolate compound and at least one second compound selected from a thiocyanate compound, a thiourea compound or mixtures thereof, wherein the ratio of the thioglycolate compound to the second compound is from 1C- 1:10 to 500:1.14. The method of Claim 1J, wherein the thioglycolate compound is present in the brine solution in an amount of from 0.1 to 5.0 percent by weight and the second compound is present in the brine solution in an amount of from 0.01 to 1.0 percent by weight.v15. The method of Claim 14, wherein the ratio of the thioglycolate compound to the second compound is from 1:2 to 15:1.16. The method of Claim 13» 14 or 15 wherein the brine solution has a density of from 1078 to 2756 kg/m3 (g to 23 pounds per gallon).17• The method of any one of Claims 1316־, wherein the zinc halide is selected from zinc chloride, zinc bromide, zinc iodide or mixtures thereof, said brine also including a metal halide selected from calcium chloride, calcium bromide, calcium iodide,־ 25 ־ 31,465-Fס/.777 6 9 / 2V. v* rmagnesium chloride, magnesium bromide, magnesium iodide or mixtures thereof.For Applicant COHE B-26-3M65-F