Corrosion inhibition
AssigneePetroliam Nasional Berhad
InventorsKris Anderson, Peter Goodrich, Christopher Hardacre, Azlan Hussain, David Rooney
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Abstract
The invention relates to a method of inhibiting corrosion by corrosive fluids, and more specifically to inhibiting corrosion of a metallic surface. The method comprising adding to the corrosive fluid a specifically selected ionic liquid which is added in an amount, based on the total weight of the corrosive fluid, effective to mitigate or alleviate corrosion.
Claims51
A method of inhibiting corrosion of a metallic surface in contact with a corrosive fluid, the method comprising adding to the corrosive fluid an ionic liquid having the formula:
- [Cat+][X−—Z-Bas]
- wherein:
- [Cat+] represents one or more cationic species;
- [X−—Z-Bas] represents one or more anionic species wherein:
- X− represents an anionic moiety;
- Z is a covalent bond joining X− and Bas, or a divalent linking group;
- and
- Bas is a basic moiety,
- in an amount of from 1 to 5,000 ppm by weight, based on the total weight of the corrosive fluid.
A method according to any one of the preceding claims, wherein Bas represents a basic moiety which is the conjugate base of an acidic moiety having a pKa of less than 14.0.
A method according to any one of the preceding claims, wherein Bas comprises at least one basic nitrogen, phosphorus, sulfur, or oxygen atom.
A method according to any one of the preceding claims, wherein Z is a divalent organic radical having from 1 to 18 carbon atoms, or a covalent bond.
A method according to any one of the preceding claims, wherein [Cat+] represents one or more cationic species selected from:
- ammonium, benzimidazolium, benzofuranium, benzothiophenium, benzotriazolium, borolium, cinnolinium, diazabicyclodecenium, diazabicyclononenium, 1,4-diazabicyclo[2.2.2]octanium, diazabicyclo-undecenium, dithiazolium, furanium, guanidinium, imidazolium, indazolium, indolinium, indolium, morpholinium, oxaborolium, oxaphospholium, oxazinium, oxazolium, iso-oxazolium, oxothiazolium, phospholium, phosphonium, phthalazinium, piperazinium, piperidinium, pyranium, pyrazinium, pyrazolium, pyridazinium, pyridinium, pyrimidinium, pyrrolidinium, pyrrolium, quinazolinium, quinolinium, iso-quinolinium, quinoxalinium, quinuclidinium, selenazolium, sulfonium, tetrazolium, thiadiazolium, iso-thiadiazolium, thiazinium, thiazolium, iso-thiazolium, thiophenium, thiuronium, triazinium, triazolium, iso-triazolium, and uronium.
A method according to any one of the preceding claims, wherein the ionic liquid has a melting point of less than 150° C.
A method according to any one of the preceding claims, wherein the basic ionic liquid is added to the corrosive fluid in an amount of from 10 to 2,000 ppm by weight, based on the total weight of the corrosive fluid.
A method according to any one of the preceding claims, wherein the corrosive fluid is an acid-containing hydrocarbon fluid.
A method according to any one of the preceding claims, wherein the metallic surface is the surface of a reactor vessel or distillation vessel.
A method according to any one of the preceding claims, wherein the metallic
A method according to claim 41, wherein the metallic surface is a steel surface.
Dependencies are inferred from the claim text.