# US 2019/0169501 A1 · Aqueous oil-in-water emulsions of organic amines > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2019/0169501 A1 - Document ID: US20190169501A1 - Status: Published application - Kind: A1 - Application number: 16/307,090 - Filed: 2017-06-07 - Published: 2019-06-06 - Earliest claimed: 2016-06-22 - Assignees: Kurita Water Industries Ltd. - Applicants: Kurita Water Industries Ltd. - Inventors: Julia JASPER; Kirstin ZIMMER; Andre DE BACHE; Wolfgang HATER - Web page: https://patentgrep.com/patent/US20190169501A1 ## CPC - C09K 15/18: containing an amine or imine moiety - B01F 23/4105: {Methods of emulsifying} - B01F 27/27: Mixers with stator-rotor systems, e.g. with intermeshing teeth or cylinders or having orifices (the stirrers having a central axial inflow and a substantially radial outflow B01F27/81) - C02F 5/12: containing nitrogen (C02F5/14 takes precedence) - C09K 5/10: Liquid materials - C23F 11/10: using organic inhibitors - C23F 11/141: {Amines; Quaternary ammonium compounds} - C23F 14/02: by chemical means - B01F 23/4145: {Emulsions of oils, e.g. fuel, and water} - C02F 2103/023: {Water in cooling circuits} - C02F 2303/08: Corrosion inhibition - C09K: MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE - B01F: MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING (mixing paints B44D3/06) - C02F: TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE (separation in general B01D; special arrangements on waterborne vessels of installations for treating water, waste water or sewage, e.g. for producing fresh water, B63J; adding materials to water to prevent corrosion C23F; treating radioactively-contaminated liquids G21F9/04; regeneration of reactants for recirculation into processes, see the relevant places for the processes) - C23F: NON-MECHANICAL REMOVAL OF METALLIC MATERIAL FROM SURFACE (working metal by laser beams B23K26/00; desurfacing by applying flames B23K7/00; working of metal by electro-erosion B23H; producing decorative effects by removing surface material, e.g. by engraving, by etching, B44C1/22; electrolytic etching or polishing C25F); INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL; MULTI-STEP PROCESSES FOR SURFACE TREATMENT OF METALLIC MATERIAL INVOLVING AT LEAST ONE PROCESS PROVIDED FOR IN CLASS C23 AND AT LEAST ONE PROCESS COVERED BY SUBCLASS C21D OR C22F OR CLASS C25 ## Abstract The present invention relates to aqueous oil-in-water emulsion containing: a) an oil phase comprising at least one organic amine of the formula (I) R1—(NH—R2)n—NH2 (I) wherein n is an integer from 0 to 7, in particular 0, 1 or 2, R1 is a linear or branched, acyclic hydrocarbon group having 12 to 22 carbon atoms; R2 is C2-C4-alkanediyl; b) and water, wherein the amount of amines of formula (I) with n being 1 or 2 is at least 90% by weight, based on the total amount of amines of the formula (I) contained in the oil phase. The invention also relates to the use of these emulsions as a corrosion inhibitor in water-bearing systems. ## Claims ### Claim 1 An aqueous oil-in-water emulsion containing a) 1 to 5% by weight, based on the total weight of the emulsion, of an oil phase comprising at least one organic amine of the formula (I) R1—(NH—R2)n—NH2 (I) wherein n is 0, 1 or 2 R1 is a linear or branched, acyclic hydrocarbon group having 12 to 22 carbon atoms; R2 is C2-C4-alkanediyl; b) and water, where the aqueous oil-in-water emulsion does not contain more than 2% by weight of organic ingredients, which are different from the amines of formula (I), based on total amount of organic components contained in the aqueous oil-in-water emulsion, and where the organic amine of formula (I) comprises at least 90% by weight, based on the total amount of the organic amine of formula (I) contained in the aqueous oil-in-water emulsion, of an organic amine of formula (I) with n being 1 or 2, where the aqueous emulsion has at least one of the following properties: P.1: the number average particle diameter of the droplets of the oil phase, as determined by light microscopy of at least 50 droplets is in the range of 1 to 11 μm, P.2: the instability index as defined by the ratio of observed clarification to maximum clarification, as determined by centrifugation for 390 seconds at a gravitational acceleration of 2.23 g and a temperature of 25° C. is at most 0.025. ### Claim 2 (depends on 1) The emulsion of claim 1, wherein R1 in formula (I) has 16 to 20 carbon atoms. ### Claim 3 (depends on 1) The emulsion of claim 1, wherein R1 in formula (I) is a saturated straight chain hydrocarbon group or an unsaturated straight chain hydrocarbon group having 1, 2 or 3 C═C double bonds. ### Claim 4 (depends on 1) The emulsion of claim 1, wherein at least 70% by weight of the amine of formula (I) bear a hydrocarbon group R1 having 18 carbon atoms, said hydrocarbon group being a saturated straight chain hydrocarbon group or an unsaturated straight chain hydrocarbon group having 1 C═C double bond. ### Claim 5 (depends on 1) The emulsion of claim 1, wherein the organic amine of formula (I) comprises at least 90% of the organic amine of formula (I), wherein n is 1. ### Claim 6 (depends on 1) The emulsion of claim 1, wherein R2 in formula (I) is propane-1,3-diyl. ### Claim 7 (depends on 1) The emulsion of claim 1, wherein the amine of formula (I), wherein n is 1 or 2, contributes with at least 90% by weight to the total amount of organic carbon contained in the emulsion. ### Claim 8 (depends on 1) The emulsion of claim 1 having a pH as determined at 20° C. in the range from 10.0 to 12.0. ### Claim 9 (depends on 1) A process for producing the aqueous oil-in-water emulsion of claim 1, which comprises the following steps: i) providing a mixture of an organic amine of the formula (I) and water, where the organic amine of formula (I) comprises at least 90% by weight, based on the total amount of the organic amine of formula (I), of an organic amine of formula (I) with n being 1 or 2, wherein the weight ratio of the organic amine of the formula (I) and water is in the range from 1:99 to 5:95; ii) homogenizing the mixture by using a rotor-stator homogenizer or by using a high pressure homogenizer, where steps i) and ii) can be performed successively or jointly. ### Claim 10 (depends on 9) The process of claim 9, where the water used for providing the mixture of the oil phase and water has a conductivity of at most 30 μS/cm. ### Claim 11 (depends on 10) The process of claim 10, where the homogenizer is a rotor of the rotor-stator homogenizer, which is operated with a peripheral speed of 5 to 40 m/s. ### Claim 12 (depends on 9) An aqueous oil-in-water emulsion, which is obtainable by a process of claim 9. ### Claim 13 (depends on 1) The use of the aqueous oil-in-water emulsion of claim 1 as a corrosion inhibitor in water-bearing systems. ### Claim 14 (depends on 1) A method for inhibiting corrosion in a water-bearing system, which comprises adding a corrosion inhibiting amount of an aqueous oil-in-water emulsion as defined in claim 1 to the water-bearing system. ### Claim 15 (depends on 13) The use of claim 13, where the water-bearing system is selected from water circuits and steam circuits of steam generators.