EP3676245A1 - Weakly coloured sulfonic acid - Google Patents

Weakly coloured sulfonic acid

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Publication number
EP3676245A1
EP3676245A1 EP18773237.5A EP18773237A EP3676245A1 EP 3676245 A1 EP3676245 A1 EP 3676245A1 EP 18773237 A EP18773237 A EP 18773237A EP 3676245 A1 EP3676245 A1 EP 3676245A1
Authority
EP
European Patent Office
Prior art keywords
acid
ppm
sulfonic acid
sulfonic
solvent
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
EP18773237.5A
Other languages
German (de)
French (fr)
Inventor
Jean-Alex Laffitte
Bernard Monguillon
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Arkema France SA
Original Assignee
Arkema France SA
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Arkema France SA filed Critical Arkema France SA
Publication of EP3676245A1 publication Critical patent/EP3676245A1/en
Pending legal-status Critical Current

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
    • C07C309/00—Sulfonic acids; Halides, esters, or anhydrides thereof
    • C07C309/01—Sulfonic acids
    • C07C309/02—Sulfonic acids having sulfo groups bound to acyclic carbon atoms
    • C07C309/03—Sulfonic acids having sulfo groups bound to acyclic carbon atoms of an acyclic saturated carbon skeleton
    • C07C309/04—Sulfonic acids having sulfo groups bound to acyclic carbon atoms of an acyclic saturated carbon skeleton containing only one sulfo group
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
    • C07C303/00—Preparation of esters or amides of sulfuric acids; Preparation of sulfonic acids or of their esters, halides, anhydrides or amides
    • C07C303/42—Separation; Purification; Stabilisation; Use of additives
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
    • C07C309/00—Sulfonic acids; Halides, esters, or anhydrides thereof
    • C07C309/01—Sulfonic acids
    • C07C309/02—Sulfonic acids having sulfo groups bound to acyclic carbon atoms
    • C07C309/03—Sulfonic acids having sulfo groups bound to acyclic carbon atoms of an acyclic saturated carbon skeleton
    • C07C309/06—Sulfonic acids having sulfo groups bound to acyclic carbon atoms of an acyclic saturated carbon skeleton containing halogen atoms, or nitro or nitroso groups bound to the carbon skeleton
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
    • C07C309/00—Sulfonic acids; Halides, esters, or anhydrides thereof
    • C07C309/01—Sulfonic acids
    • C07C309/28—Sulfonic acids having sulfo groups bound to carbon atoms of six-membered aromatic rings of a carbon skeleton
    • C07C309/29—Sulfonic acids having sulfo groups bound to carbon atoms of six-membered aromatic rings of a carbon skeleton of non-condensed six-membered aromatic rings
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
    • C07C309/00—Sulfonic acids; Halides, esters, or anhydrides thereof
    • C07C309/01—Sulfonic acids
    • C07C309/28—Sulfonic acids having sulfo groups bound to carbon atoms of six-membered aromatic rings of a carbon skeleton
    • C07C309/29—Sulfonic acids having sulfo groups bound to carbon atoms of six-membered aromatic rings of a carbon skeleton of non-condensed six-membered aromatic rings
    • C07C309/30—Sulfonic acids having sulfo groups bound to carbon atoms of six-membered aromatic rings of a carbon skeleton of non-condensed six-membered aromatic rings of six-membered aromatic rings substituted by alkyl groups
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
    • C07C309/00—Sulfonic acids; Halides, esters, or anhydrides thereof
    • C07C309/01—Sulfonic acids
    • C07C309/28—Sulfonic acids having sulfo groups bound to carbon atoms of six-membered aromatic rings of a carbon skeleton
    • C07C309/33—Sulfonic acids having sulfo groups bound to carbon atoms of six-membered aromatic rings of a carbon skeleton of six-membered aromatic rings being part of condensed ring systems
    • C07C309/34—Sulfonic acids having sulfo groups bound to carbon atoms of six-membered aromatic rings of a carbon skeleton of six-membered aromatic rings being part of condensed ring systems formed by two rings
    • C07C309/35—Naphthalene sulfonic acids
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23F—NON-MECHANICAL REMOVAL OF METALLIC MATERIAL FROM SURFACE; 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
    • C23F11/00—Inhibiting corrosion of metallic material by applying inhibitors to the surface in danger of corrosion or adding them to the corrosive agent
    • C23F11/04—Inhibiting corrosion of metallic material by applying inhibitors to the surface in danger of corrosion or adding them to the corrosive agent in markedly acid liquids
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23F—NON-MECHANICAL REMOVAL OF METALLIC MATERIAL FROM SURFACE; 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
    • C23F11/00—Inhibiting corrosion of metallic material by applying inhibitors to the surface in danger of corrosion or adding them to the corrosive agent
    • C23F11/08—Inhibiting corrosion of metallic material by applying inhibitors to the surface in danger of corrosion or adding them to the corrosive agent in other liquids
    • C23F11/18—Inhibiting corrosion of metallic material by applying inhibitors to the surface in danger of corrosion or adding them to the corrosive agent in other liquids using inorganic inhibitors
    • C23F11/181—Nitrogen containing compounds

Definitions

  • the present invention relates to the field of sulfonic acids and more particularly the field of weakly colored sulfonic acids, and their preparation process.
  • Sulphonic acids and in particular so-called organic sulfonic acids, such as, for example, methanesulfonic acid (AMS), para-toluenesulfonic acid (APTS), benzenesulphonic acid (BS), ), trifluoromethanesulfonic acid are strong acids widely used in many applications, including catalysis and surface treatment, such as electroplating, stripping, cleaning, descaling, to name only the main ones of them, to limit themselves to it.
  • AMS methanesulfonic acid
  • APTS para-toluenesulfonic acid
  • BS benzenesulphonic acid
  • trifluoromethanesulfonic acid are strong acids widely used in many applications, including catalysis and surface treatment, such as electroplating, stripping, cleaning, descaling, to name only the main ones of them, to limit themselves to it.
  • weakly corrosive sulfonic acids also known as “weak corrosion”
  • weak corrosion have the disadvantage that they are colored more or less rapidly, depending on the nature of the sulphonic acid, the nitrite used, and the concentration of nitrite in said sulphonic acid.
  • This coloration may be troublesome for the intended applications, particularly when the sulfonic acids are used as cleaning agents, as reaction catalysts for the manufacture of high value-added products, and others.
  • the coloration may be considered as resulting from the presence of impurities which, in addition to polluting the sulphonic acid and rendering it unfit for the intended use, may at least render it incompatible with commercial specifications.
  • This coloration therefore represents a major drawback for "weak corrosion" sulfonic acids, that is to say for sulfonic acids which include nitrites to make them weakly corrosive vis-à-vis metals and passivable alloys, iron, nickel, titanium, copper, aluminum, molybdenum, manganese, lead, and their alloys, as well as the pairs of these metals or alloys obtained by contact (crimping, riveting, bolting, welding, brazing), in particular with respect to stainless steels, and in particular common stainless steels (for example of the type AISI 304L and AISI 316L), but also more generally any stainless steel as defined in the standard NF EN 10088-1.
  • sulfonic acids which include nitrites to make them weakly corrosive vis-à-vis metals and passivable alloys, iron, nickel, titanium, copper, aluminum, molybdenum, manganese, lead, and their alloys, as well as the pairs of these metals or
  • a sulphonic acid is "colored" when its APHA color is strictly greater than 20.
  • a weakly colored sulphonic acid in the sense of the present invention is a sulphonic acid which the color APHA is less than 20, preferably less than 15, more preferably less than 10, most preferably less than 5.
  • the APHA color is a color standard named for the American Public Health Association and defined by ASTM D1209, and more specifically ASTM D1209-05 (201 1).
  • the color APHA is a color scale, sometimes also called "yellowness index", which allows to evaluate the quality of liquids that are light to yellowish in color.
  • the APHA color is measured using a colorimeter with a standard range from 0 to 200 APHA.
  • a weak sulfonic acid corrosion according to the present invention remains in the passive state after application of a current of -800 ⁇ . ⁇ 2 , for 1 minute, while a sulfonic acid not in accordance with the present invention.
  • the present invention (corrosive), returns to the active state (corrosion) after depassivation by application of said current amount of -800 ⁇ . ⁇ 2 for 1 minute.
  • the low-corrosion sulphonic acids of the present invention are conventional sulphonic acids in which at least one nitrite has been added, and whose nitrite / sulphonic acid molar ratio is between 200 ppm and 6000 ppm, preferably between 400 ppm. and 2000 ppm, in particular between 500 ppm and 1900 ppm.
  • conventional sulfonic acids may contain chloride ions in greater or lesser amounts.
  • the presence and the quantity of chloride ions in the conventional sulphonic acids may result from many factors, among which the chlorine derivative (s) used in the process of manufacture of said conventional sulphonic acid itself, the chlorides or chlorinated derivatives present in the various solvents, additives, auxiliaries, fillers intended to formulate said sulphonic acid in order to facilitate its implementation, its use and its efficiency in the envisaged applications, and other.
  • the present invention relates to a sulfonic acid comprising:
  • APHA color is less than 20, preferably less than 15, more preferably less than 10, most preferably less than 5.
  • sulfonic acid any sulfonic acid known to those skilled in the art and more particularly the sulfonic acids of formula R-SO3H, where R represents a saturated or unsaturated hydrocarbon chain, linear, branched or cyclic , having 1 to 12 carbon atoms, substituted or unsubstituted by one or more radicals and / or atoms selected from halogen atoms (such as fluorine, chlorine, bromine), alkyl radicals containing from 1 to 6 carbon atoms, carbon and 6 or 10-membered aryl and heteroaryl radicals.
  • R represents a saturated or unsaturated hydrocarbon chain, linear, branched or cyclic , having 1 to 12 carbon atoms, substituted or unsubstituted by one or more radicals and / or atoms selected from halogen atoms (such as fluorine, chlorine, bromine), alkyl radicals containing from 1 to 6 carbon atoms, carbon and 6 or 10-membered aryl and hetero
  • alkyl is meant a saturated hydrocarbon radical, linear or branched.
  • aryl is meant an aromatic radical, preferably phenyl or naphthyl, more preferably phenyl.
  • heteroaryl is meant an aromatic radical having one or more heteroatoms selected from oxygen, nitrogen and sulfur.
  • R is a hydrocarbon chain having 1 to 6 carbon atoms, more preferably selected from methyl, ethyl, n-propyl, / 'so-propyl, n-butyl, /' so-butyl, sec-butyl tert-butyl, linear or branched pentyl radicals, linear or branched hexyl radicals, and phenyl and naphthyl radicals.
  • the sulphonic acids included in the context of the present invention are preferably selected from methanesulfonic acid, ethanesulfonic acid, n-propanesulfonic acid, propane-sulfonic isophthalic acid, n-butane-sulfonic acid, / 'n-butane-sulfonic acid, sec-butane-sulphonic acid, tert-butane-sulphonic acid, trifluoromethanesulfonic acid, para-toluenesulfonic acid, benzenesulfonic acid, naphthalenesulfonic acid and mixtures of two or more of them in all proportions.
  • the sulphonic acid used in the context of the present invention is methanesulfonic acid, ethanesulfonic acid, trifluoromethanesulphonic acid or para-toluenesulphonic acid.
  • the sulfonic acid is methanesulfonic acid.
  • the sulfonic acid used in the context of the present invention may be sulfonic acid alone or in a mixture of two or more sulfonic acids, optionally in a solvent medium and optionally in admixture with one or more additives and / or fillers. known to those skilled in the art.
  • the sulfonic acid (s) may be in a solvent medium, said solvent may be water or an organic solvent or a mixture of organic solvents, or water mixed with one or more other organic solvents.
  • concentration of sulphonic acid (s) in the solvent (s) is between 0.01% and 100%, inclusive limits, by weight of sulphonic acid (s) relative to the total weight of sulfonic acid (s) in a solvent medium, it being understood that when the concentration is equal to 100%, the amount of solvent is zero or negligible or non-detectable.
  • this concentration is between 0.01% and 99.99%, preferably between 0.1% and 99.9%, more preferably between 0.5% and 75%, limits included, by weight of sulfonic acid (s) relative to the total weight of sulfonic acid (s) in a solvent medium.
  • organic solvents indicated above and used to solvanter the (s) sulfonic acid (s) may be of any type known to those skilled in the art, and preferably the water-soluble organic solvents.
  • water-soluble organic solvents such as alcohols, sulphoxides, mineral or organic acids, more preferably the methanol, ethanol, dimethylsulfoxide, sulfuric acid, to name only the most common and well known of them.
  • the additives and fillers that may be present in admixture with the sulphonic acids may for example be, without limitation, one or more additives and / or fillers chosen from viscosity or rheology modifiers, foaming agents, anti-foaming agents, surfactants, disinfectants, biocides, stabilizers, oxidizing agents, enzymes, pigments, dyes, flame retardants, flame retardants, fragrances, flavors, and others.
  • nitrite in the proportions indicated above can be carried out according to any method known to those skilled in the art, in particular by adding one or more nitrite (s) of alkali metal or alkaline earth metal, in solid form or dissolved in a solvent, such as water.
  • a solvent such as water.
  • the amount of chlorides present in the sulfonic acid can be easily controlled and adjusted depending on the nature of the sulfonic acid production process itself, its degree of purity, which can be improved according to one or several techniques known to those skilled in the art, such as distillation, recrystallization, and others.
  • the amount of chlorides present in the sulfonic acid can be easily controlled and adjusted depending on the nature of the potential solvent (s), additives and fillers added thereto. Those skilled in the art will readily understand that a sulphonic acid with a low chloride content will see this content increased, if it is decided, for example, to dilute said sulphonic acid in water with a high concentration of chloride or to add a charge. such as a salt containing chlorides.
  • the low-corrosion sulfonic acid according to the present invention thus has an APHA color is less than 20, preferably less than 15, more particularly less than 10, especially less than 5, that is to say a absence or almost no color, which makes it possible to have a low-corrosion sulfonic acid, thus satisfying most or all commercial specifications, in a very large number of fields of application.
  • the present invention also relates to a composition
  • a composition comprising at least one sulphonic acid as defined above, a solvent as defined above, preferably water, and optionally one or more additive (s) and / or load (s) as defined above.
  • AMS methanesulfonic acid
  • sample 4 chloride / AMS molar ratio equal to 220 ppm.
  • the flask is immediately closed hermetically and the whole is placed under agitation (400 rpm) for 1 hour at 20 ° C. Nitrogen is then bubbled into the solution (flow rate 10 mL.mn- 1 ) for 360 minutes.
  • the color of each sample is then measured using a colorimeter LICO 620 from the company HACH, with a standard range between 0 and 200 APHA.
  • the apparatus is previously calibrated with standard solutions ranging from 0 to 200 APHA.
  • a sample of 4 mL of the solution whose color is to be determined is introduced into a cuvette provided by Hach and the color is read automatically on the device.
  • the AMS / inhibitor mixture is colorless
  • the APHA value is greater than 20 and the methanesulfonic acid is colored.
  • the measurement of the amount of chlorides present in a sulfonic acid is carried out by argentimetry using a potentiometer equipped with a silver sulfide electrode sold by the company Metrohm AG under the reference 6.0404.100.
  • Nitrites can be determined by any method known to those skilled in the art and for example by ion chromatography.
  • the samples to be tested are diluted approximately 150 times (0.6 g of sample and then 100 ml supplement with ultrapure water) and passed on an ICS5000 device from the company Dionex TM.
  • the detection mode is the conductimetry and the results are read against a previously established calibration curve.
  • the calibration range is prepared from standards of nitrites, as well as an AMS matrix.
  • Commercial standards of nitrites 1000 mg.L -1 in water, supplier CPA) 1, 10 and 100 mg.L "1 solutions are prepared by diluting them in ultra pure water.
  • the AMS matrix is made from a commercial solution of 70% AMS (Sigma-Aldrich) diluted in ultra pure water. To do this, 0.6 g of 70% AMS is weighed into a 100 ml volumetric flask, and then complete with ultra pure water.
  • reference electrode saturated calomel electrode or "ECS"
  • working electrode 304L stainless steel test specimen of size 1 cm 2 .
  • test piece of the material to be tested is polished with abrasive paper P400 and then passivated for 1 hour in a 10% nitric acid solution at room temperature. This allows an identical starting state for all tests.
  • the temperature of the test is thermostated at 20 ° C ⁇ 2 ° C.
  • the applied protocol comprises the following three steps:
  • the behavior is completely different in a 70% solution by weight in water of a methanesulfonic acid additive nitrites.
  • methanesulfonic acid added with sodium nitrite is a weak methane-sulfonic acid corrosion in the sense of the present invention.

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  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Inorganic Chemistry (AREA)
  • Preventing Corrosion Or Incrustation Of Metals (AREA)
  • Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
  • Coloring Foods And Improving Nutritive Qualities (AREA)
  • Detergent Compositions (AREA)

Abstract

The present invention relates to a weakly corrosive and weakly coloured sulfonic acid, with APHA colour index less than 20, comprising chlorides and nitrites in a chloride/sulfonic acid molar ratio of between 1 ppm and 200 ppm, and a nitrite/sulfonic acid molar ratio of between 200 ppm and 6000 ppm, with the limits included.

Description

ACIDE SULFONIQUE FAIBLEMENT COLORÉ  LOW COLOR SULFONIC ACID
[0001] La présente invention concerne le domaine des acides sulfoniques et plus particulièrement le domaine des acides sulfoniques faiblement colorés, ainsi que leur procédé de préparation. The present invention relates to the field of sulfonic acids and more particularly the field of weakly colored sulfonic acids, and their preparation process.
[0002] Les acides sulfoniques, et en particulier les acides sulfoniques dits organiques, tels que par exemple l'acide méthane-sulfonique (AMS), l'acide para- toluène-sulfonique (APTS), l'acide benzène-sulfonique (BS), l'acide trifluoro- méthane-sulfonique sont des acides forts largement utilisés dans de nombreuses applications, notamment en catalyse et en traitement de surfaces, telles que la galvanoplastie, le décapage, le nettoyage, le détartrage, pour ne citer que les principales d'entre elles, s'en s'y limiter.  [0002] Sulphonic acids, and in particular so-called organic sulfonic acids, such as, for example, methanesulfonic acid (AMS), para-toluenesulfonic acid (APTS), benzenesulphonic acid (BS), ), trifluoromethanesulfonic acid are strong acids widely used in many applications, including catalysis and surface treatment, such as electroplating, stripping, cleaning, descaling, to name only the main ones of them, to limit themselves to it.
[0003] Il a cependant été observé que les solutions aqueuses de tels acides sulfoniques corrodent les métaux, les vitesses de corrosion dépendant à la fois de la concentration en acide, de la température et de la nature du métal. Par exemple, à température ambiante, l'acier inoxydable du type 304L ou 1 .4307 est corrodable à des concentrations d'AMS supérieures à 5% en poids dans l'eau. De tels risques de corrosion sont inacceptables dans de nombreuses applications, et particulièrement pour le stockage de ces acides principalement lorsqu'ils sont en solution aqueuse.  It has however been observed that aqueous solutions of such sulfonic acids corrode metals, the corrosion rates depending on both the acid concentration, the temperature and the nature of the metal. For example, at room temperature, type 304L or 1,4307 stainless steel is corrodible at AMS concentrations greater than 5% by weight in water. Such corrosion risks are unacceptable in many applications, and particularly for the storage of these acids mainly when they are in aqueous solution.
[0004] Pour rendre les acides sulfoniques peu, voire non, corrosifs envers les métaux, et particulièrement envers les aciers inoxydables, de nombreux travaux ont déjà été réalisés, parmi lesquels une technique qui a montré des résultats satisfaisants consiste en l'ajout de nitrates dans lesdits acides. Cette méthode est en particulier décrite par B. Gaur et H. S. Srinivasan (« British Corrosion Journal », 34(1 ), (1999), 63-66) qui ont montré que l'addition d'ions ferriques ou nitrates permet de produire un effet inhibiteur de corrosion par l'AMS sur divers aciers. To make sulfonic acids little or no corrosive to metals, particularly to stainless steels, many work has already been done, among which a technique that has shown satisfactory results is the addition of nitrates in said acids. This method is in particular described by B. Gaur and HS Srinivasan ("British Corrosion Journal", 34 (1), (1999), 63-66) which have shown that the addition of ferric ions or nitrates makes it possible to produce a corrosion inhibiting effect by AMS on various steels.
[0005] D'autres solution ont été étudiées, parmi lesquelles on peut par exemple citer celle décrite dans la demande EP0931854, qui propose d'inhiber la corrosion des aciers inoxydables en milieu acide organo-sulfonique, en ajoutant au moins un oxydant choisi parmi les sels ou oxydes de cérium(IV), de fer(lll), de molybdène(VI) ou de vanadium(V), les nitrites et les persulfates. [0006] Les acides sulfoniques additivés par des nitrites sont tout spécialement intéressants en raison de leur caractère tout particulièrement peu corrosifs vis-à-vis des métaux et en particulier des aciers inoxydables. Ces acides sulfoniques faiblement corrosifs (dits aussi « faible corrosion ») présentent malheureusement l'inconvénient de se colorer plus ou moins rapidement, selon la nature de l'acide sulfonique, du nitrite utilisé, et de la concentration en nitrite dans ledit acide sulfonique. Other solutions have been studied, among which can be cited for example that described in the application EP0931854, which proposes to inhibit the corrosion of stainless steels in organosulfonic acid medium, by adding at least one oxidant chosen from salts or oxides of cerium (IV), iron (III), molybdenum (VI) or vanadium (V), nitrites and persulphates. The sulfonic acids additives with nitrites are especially interesting because of their particularly low corrosive character vis-à-vis metals and in particular stainless steels. These weakly corrosive sulfonic acids (also known as "weak corrosion") have the disadvantage that they are colored more or less rapidly, depending on the nature of the sulphonic acid, the nitrite used, and the concentration of nitrite in said sulphonic acid.
[0007] Cette coloration peut s'avérer gênante pour les applications envisagées, en particulier lorsque les acides sulfoniques sont utilisés comme agents de nettoyage, comme catalyseurs de réactions pour la fabrication de produits à haute valeur ajoutée, et autres. En outre, la coloration peut être considérée comme résultant de la présence d'impuretés qui, outre le fait de polluer l'acide sulfonique et le rendre impropre à l'utilisation envisagée, peut tout au moins le rendre incompatible aux spécifications commerciales.  This coloration may be troublesome for the intended applications, particularly when the sulfonic acids are used as cleaning agents, as reaction catalysts for the manufacture of high value-added products, and others. In addition, the coloration may be considered as resulting from the presence of impurities which, in addition to polluting the sulphonic acid and rendering it unfit for the intended use, may at least render it incompatible with commercial specifications.
[0008] Cette coloration représente donc un inconvénient majeur pour les acides sulfoniques « faible corrosion », c'est-à-dire pour les acides sulfoniques qui comprennent des nitrites pour les rendre faiblement corrosifs vis-à-vis des métaux et alliages passivables, notamment à base de fer, nickel, titane, cuivre, aluminium, molybdène, manganèse, plomb, et de leurs alliages, ainsi que les couples de ces métaux ou alliages obtenus par contact (sertissage, rivetage, boulonnage, soudage, brasage), notamment vis-à-vis des aciers inoxydables, et en particulier les aciers inoxydables courants (par exemple de type AISI 304L et AISI 316L), mais aussi plus généralement tout acier inoxydable tel que défini dans la norme NF EN 10088-1 .  This coloration therefore represents a major drawback for "weak corrosion" sulfonic acids, that is to say for sulfonic acids which include nitrites to make them weakly corrosive vis-à-vis metals and passivable alloys, iron, nickel, titanium, copper, aluminum, molybdenum, manganese, lead, and their alloys, as well as the pairs of these metals or alloys obtained by contact (crimping, riveting, bolting, welding, brazing), in particular with respect to stainless steels, and in particular common stainless steels (for example of the type AISI 304L and AISI 316L), but also more generally any stainless steel as defined in the standard NF EN 10088-1.
[0009] La Demanderesse a maintenant découvert que la coloration des acides sulfoniques dits « faible corrosion » est notamment due à la présence d'ions chlorures dans lesdits acides sulfoniques. The Applicant has now discovered that the coloration of sulfonic acids called "low corrosion" is due in particular to the presence of chloride ions in said sulfonic acids.
[0010] Dans la présente invention, on considère qu'un acide sulfonique est « coloré » lorsque sa couleur APHA est strictement supérieure à 20. À l'inverse, un acide sulfonique faiblement coloré au sens de la présente invention est un acide sulfonique dont la couleur APHA est inférieure à 20, de préférence inférieure à 15, plus particulièrement inférieure à 10, tout particulièrement inférieure à 5.  In the present invention, it is considered that a sulphonic acid is "colored" when its APHA color is strictly greater than 20. Conversely, a weakly colored sulphonic acid in the sense of the present invention is a sulphonic acid which the color APHA is less than 20, preferably less than 15, more preferably less than 10, most preferably less than 5.
[0011] La couleur APHA, est une norme de couleur nommée pour l'American Public Health Association et définie par la norme ASTM D1209, et plus précisément la norme ASTM D1209-05(201 1 ). La couleur APHA est une échelle de couleurs, parfois également dénommée «indice de jaunissement», qui permet d'évaluer la qualité des liquides qui sont de couleur claire à jaunâtre. La couleur APHA est mesurée à l'aide d'un colorimètre avec une gamme étalon allant de 0 à 200 APHA. The APHA color, is a color standard named for the American Public Health Association and defined by ASTM D1209, and more specifically ASTM D1209-05 (201 1). The color APHA is a color scale, sometimes also called "yellowness index", which allows to evaluate the quality of liquids that are light to yellowish in color. The APHA color is measured using a colorimeter with a standard range from 0 to 200 APHA.
[0012] Dans la présente invention, on entend par « acide sulfonique faible corrosion », un acide sulfonique dont le potentiel reste quasiment au même niveau et ne remonte pas après application d'une quantité de courant de -800 μΑ.αττ2, pendant 1 minute, puis arrêt de l'application de ce courtant, comme expliqué plus loin dans le protocole de test de validation « faible corrosion ». In the present invention, the term "weak sulfonic acid corrosion", a sulfonic acid whose potential remains virtually the same level and does not rise after application of a current amount of -800 μΑ.αττ 2 , while 1 minute, then stop the application of this short, as explained later in the "low corrosion" validation test protocol.
[0013] En d'autres termes un acide sulfonique faible corrosion selon la présente invention reste à l'état passif après application d'un courant de -800 μΑ.αττ2, pendant 1 minute, alors qu'un acide sulfonique non conforme à la présente invention (corrosif), retourne à l'état actif (corrosion) après dépassivation par application de ladite quantité de courant de -800 μΑ.αττ2, pendant 1 minute. In other words a weak sulfonic acid corrosion according to the present invention remains in the passive state after application of a current of -800 μΑ.αττ 2 , for 1 minute, while a sulfonic acid not in accordance with the present invention. the present invention (corrosive), returns to the active state (corrosion) after depassivation by application of said current amount of -800 μΑ.αττ 2 for 1 minute.
[0014] Les acides sulfoniques faible corrosion de la présente invention sont des acides sulfoniques conventionnels dans lesquels au moins un nitrite a été ajouté, et dont le ratio molaire nitrite/acide sulfonique est compris entre 200 ppm et 6000 ppm, de préférence entre 400 ppm et 2000 ppm, en particulier entre 500 ppm et 1900 ppm. The low-corrosion sulphonic acids of the present invention are conventional sulphonic acids in which at least one nitrite has been added, and whose nitrite / sulphonic acid molar ratio is between 200 ppm and 6000 ppm, preferably between 400 ppm. and 2000 ppm, in particular between 500 ppm and 1900 ppm.
[0015] Or les acides sulfoniques conventionnels peuvent contenir des ions chlorures en quantités plus ou moins importantes. La présence et la quantité d'ions chlorures dans les acides sulfoniques conventionnels peuvent résulter de nombreux facteurs, parmi lesquels on peut, de manière non limitative, citer le ou les dérivé(s) chloré(s) utilisé(s) dans le procédé de fabrication dudit acide sulfonique conventionnel lui-même, les chlorures ou dérivés chlorés présent dans les divers solvants, additifs, auxiliaires, charges destinés à formuler ledit acide sulfonique afin de faciliter sa mise en œuvre, son utilisation et son efficacité dans les applications envisagées, et autres.  However, conventional sulfonic acids may contain chloride ions in greater or lesser amounts. The presence and the quantity of chloride ions in the conventional sulphonic acids may result from many factors, among which the chlorine derivative (s) used in the process of manufacture of said conventional sulphonic acid itself, the chlorides or chlorinated derivatives present in the various solvents, additives, auxiliaries, fillers intended to formulate said sulphonic acid in order to facilitate its implementation, its use and its efficiency in the envisaged applications, and other.
[0016] Sans vouloir être lié par la théorie, il a été établi que la présence d'ions chlorures entraîne la coloration d'acides sulfoniques dans lesquels ont été ajoutés des ions nitrites afin de leur conférer des propriétés non corrosives ou faiblement corrosives. [0017] Il a maintenant été découvert qu'il est possible de pouvoir disposer d'un acide sulfonique faiblement coloré, même lorsque ledit acide comprend des ions chlorures, et des ions nitrites ajoutés afin de lui conférer des propriétés non corrosives ou faiblement corrosives. Without wishing to be bound by the theory, it has been established that the presence of chloride ions causes the coloration of sulfonic acids in which nitrite ions have been added to give them non-corrosive or weakly corrosive properties. It has now been discovered that it is possible to have a weakly colored sulphonic acid, even when said acid comprises chloride ions, and nitrite ions added in order to confer non-corrosive properties or weakly corrosive.
[0018] Ainsi, et selon un premier aspect, la présent invention concerne un acide sulfonique comprenant :  Thus, and according to a first aspect, the present invention relates to a sulfonic acid comprising:
un ratio molaire chlorure/acide sulfonique compris entre 1 ppm et 200 ppm, de préférence entre 5 ppm et 200 ppm, de préférence encore entre 10 ppm et 200 ppm, plus préférentiellement entre 10 ppm et 190 ppm, bornes incluses, et un ratio molaire nitrite/acide sulfonique compris entre 200 ppm et 6000 ppm, de préférence entre 400 ppm et 2000 ppm, particulièrement entre 500 ppm et 1900 ppm, bornes incluses,  a chloride / sulphonic acid molar ratio of between 1 ppm and 200 ppm, preferably between 5 ppm and 200 ppm, more preferably between 10 ppm and 200 ppm, more preferably between 10 ppm and 190 ppm, limits included, and a molar ratio nitrite / sulphonic acid of between 200 ppm and 6000 ppm, preferably between 400 ppm and 2000 ppm, particularly between 500 ppm and 1900 ppm, limits included,
et dont la couleur APHA est inférieure à 20, de préférence inférieure à 15, plus particulièrement inférieure à 10, tout particulièrement inférieure à 5. and whose APHA color is less than 20, preferably less than 15, more preferably less than 10, most preferably less than 5.
[0019] Dans la présente invention, on entend par acide sulfonique tout acide sulfonique connu de l'homme du métier et plus particulièrement les acides sulfoniques de formule R-SO3H, où R représente une chaîne hydrocarbonée saturée ou insaturée, linéaire, ramifiée ou cyclique, comportant de 1 à 12 atomes de carbone, substituée ou non substituée par un ou plusieurs radicaux et/ou atomes choisis parmi les atomes d'halogène (tels que fluor, chlore, brome), les radicaux alkyles contenant de 1 à 6 atomes de carbone et les radicaux aryles et hétéroaryles à 6 ou 10 chaînons. In the present invention, the term sulfonic acid any sulfonic acid known to those skilled in the art and more particularly the sulfonic acids of formula R-SO3H, where R represents a saturated or unsaturated hydrocarbon chain, linear, branched or cyclic , having 1 to 12 carbon atoms, substituted or unsubstituted by one or more radicals and / or atoms selected from halogen atoms (such as fluorine, chlorine, bromine), alkyl radicals containing from 1 to 6 carbon atoms, carbon and 6 or 10-membered aryl and heteroaryl radicals.
[0020] Par « alkyle » on entend un radical hydrocarboné saturé, linéaire ou ramifié. Par « aryle », on entend un radical aromatique, de préférence phényle ou naphtyle, plus préférentiellement phényle. Par « hétéroaryle » on entend un radical aromatique possédant un ou plusieurs hétéroatomes choisis parmi oxygène, azote et soufre.  By "alkyl" is meant a saturated hydrocarbon radical, linear or branched. By "aryl" is meant an aromatic radical, preferably phenyl or naphthyl, more preferably phenyl. By "heteroaryl" is meant an aromatic radical having one or more heteroatoms selected from oxygen, nitrogen and sulfur.
[0021] De préférence R représente une chaîne hydrocarbonée comportant de 1 à 6 atomes de carbone, plus particulièrement choisie parmi méthyle, éthyle, n-propyle, /'so-propyle, n-butyle, /'so-butyle, sec-butyle, terf-butyle, les radicaux pentyles linéaire ou ramifiés, les radicaux hexyles linéaire ou ramifiés, et les radicaux phényle et naphtyle. [0022] Ainsi, et de manière non limitative, les acides sulfoniques compris dans le cadre de la présente invention sont de préférence choisis parmi l'acide méthane- sulfonique, l'acide éthane-sulfonique, l'acide n-propane-sulfonique, l'acide iso- propane-sulfonique, l'acide n-butane-sulfonique, l'acide /'so-butane-sulfonique, l'acide sec-butane-sulfonique, l'acide terf-butane-sulfonique, l'acide trifluoro- méthanesulfonique, l'acide para-toluènesulfonique, l'acide benzènesulfonique, l'acide naphtalènesulfonique et les mélanges de deux ou plusieurs d'entre eux en toutes proportions. [0021] Preferably R is a hydrocarbon chain having 1 to 6 carbon atoms, more preferably selected from methyl, ethyl, n-propyl, / 'so-propyl, n-butyl, /' so-butyl, sec-butyl tert-butyl, linear or branched pentyl radicals, linear or branched hexyl radicals, and phenyl and naphthyl radicals. Thus, and without limitation, the sulphonic acids included in the context of the present invention are preferably selected from methanesulfonic acid, ethanesulfonic acid, n-propanesulfonic acid, propane-sulfonic isophthalic acid, n-butane-sulfonic acid, / 'n-butane-sulfonic acid, sec-butane-sulphonic acid, tert-butane-sulphonic acid, trifluoromethanesulfonic acid, para-toluenesulfonic acid, benzenesulfonic acid, naphthalenesulfonic acid and mixtures of two or more of them in all proportions.
[0023] Selon un mode de réalisation tout particulièrement préféré, l'acide sulfonique utilisé dans le cadre de la présente invention est l'acide méthane- sulfonique, l'acide éthane-sulfonique, l'acide trifluorométhanesulfonique ou l'acide para-toluènesulfonique, de manière tout à fait préférée l'acide sulfonique est l'acide méthane-sulfonique.  According to a most particularly preferred embodiment, the sulphonic acid used in the context of the present invention is methanesulfonic acid, ethanesulfonic acid, trifluoromethanesulphonic acid or para-toluenesulphonic acid. most preferably the sulfonic acid is methanesulfonic acid.
[0024] L'acide sulfonique utilisé dans le cadre de la présente invention peut être l'acide sulfonique seul ou en mélange de deux ou plusieurs acides sulfoniques, éventuellement en milieu solvanté et éventuellement en mélange avec un ou plusieurs additifs et/ou charges bien connus de l'homme du métier.  The sulfonic acid used in the context of the present invention may be sulfonic acid alone or in a mixture of two or more sulfonic acids, optionally in a solvent medium and optionally in admixture with one or more additives and / or fillers. known to those skilled in the art.
[0025] Ainsi, le ou les acides sulfonique peuv(en)t être en milieu solvanté, ledit solvant pouvant être l'eau ou un solvant organique ou un mélange de solvants organiques, ou encore de l'eau en mélange avec un ou plusieurs autres solvants organiques. En règle générale, la concentration en acide(s) sulfonique(s) dans le(s) solvant(s) est comprise entre 0,01 % et 100 %, bornes incluses, en poids d'acide(s) sulfonique(s) par rapport au poids total d'acide(s) sulfonique(s) en milieu solvanté, étant entendu que lorsque la concentration est égale à 100%, la quantité de solvant est nulle ou négligeable ou non détectable. De préférence, cette concentration est comprise entre 0,01 % et 99,99%, de préférence entre 0,1 % et 99,9%, de préférence encore entre 0,5 % et 75 %, bornes incluses, en poids d'acide(s) sulfonique(s) par rapport au poids total d'acide(s) sulfonique(s) en milieu solvanté. Thus, the sulfonic acid (s) may be in a solvent medium, said solvent may be water or an organic solvent or a mixture of organic solvents, or water mixed with one or more other organic solvents. As a rule, the concentration of sulphonic acid (s) in the solvent (s) is between 0.01% and 100%, inclusive limits, by weight of sulphonic acid (s) relative to the total weight of sulfonic acid (s) in a solvent medium, it being understood that when the concentration is equal to 100%, the amount of solvent is zero or negligible or non-detectable. Preferably, this concentration is between 0.01% and 99.99%, preferably between 0.1% and 99.9%, more preferably between 0.5% and 75%, limits included, by weight of sulfonic acid (s) relative to the total weight of sulfonic acid (s) in a solvent medium.
[0026] Les solvants organiques indiqués ci-dessus et utilisables pour solvanter le(s) acide(s) sulfonique(s) peuvent être de tout type connu de l'homme du métier, et de préférence les solvants organiques solubles dans l'eau, tels que les alcools, les sulfoxydes, les acides minéraux ou organiques, plus préférentiellement le méthanol, l'éthanol, le diméthylsulfoxyde, l'acide sulfurique, pour ne citer que les plus courants et les plus connus d'entre eux. The organic solvents indicated above and used to solvanter the (s) sulfonic acid (s) may be of any type known to those skilled in the art, and preferably the water-soluble organic solvents. such as alcohols, sulphoxides, mineral or organic acids, more preferably the methanol, ethanol, dimethylsulfoxide, sulfuric acid, to name only the most common and well known of them.
[0027] Les additifs et charges qui peuvent être présents en mélange avec les acides sulfoniques peuvent par exemples être, à titre non limitatif, un ou plusieurs additifs et/ou charges choisi parmi les modificateurs de viscosité ou de rhéologie, les agents moussants, les agents anti-moussants, les surfactants, les désinfectants, les biocides, les stabilisateurs, les agents oxydants, les enzymes, les pigments, les colorants, les ignifugeants, les agents retardateurs de flamme, les parfums, les arômes, et autres.  The additives and fillers that may be present in admixture with the sulphonic acids may for example be, without limitation, one or more additives and / or fillers chosen from viscosity or rheology modifiers, foaming agents, anti-foaming agents, surfactants, disinfectants, biocides, stabilizers, oxidizing agents, enzymes, pigments, dyes, flame retardants, flame retardants, fragrances, flavors, and others.
[0028] Ces divers additifs et charges sont présents dans des quantités bien connues de l'homme du métier, qui peuvent varier en fonction de l'effet recherché, de la nature de l'acide sulfonique utilisé et de l'application considérée pour ledit acide sulfonique utilisé.  These various additives and fillers are present in amounts well known to those skilled in the art, which may vary depending on the desired effect, the nature of the sulfonic acid used and the application considered for said sulfonic acid used.
[0029] L'ajout de nitrite dans les proportions précédemment indiquées peut être effectué selon toute méthode connue de l'homme du métier, notamment par en ajoutant un ou plusieurs nitrite(s) de métal alcalin ou alcalino-terreux, sous forme solide ou dissoute dans un solvant, tel que l'eau. De tels acides sulfoniques additivés par un nitrite sont décrits par exemple dans la demande EP0931854.  The addition of nitrite in the proportions indicated above can be carried out according to any method known to those skilled in the art, in particular by adding one or more nitrite (s) of alkali metal or alkaline earth metal, in solid form or dissolved in a solvent, such as water. Such nitrite additive-containing sulfonic acids are described, for example, in application EP0931854.
[0030] La quantité de chlorures présente dans l'acide sulfonique peut être aisément contrôlée et ajustée en fonction de la nature du procédé de fabrication de l'acide sulfonique lui-même, de son degré de pureté, qui peut être améliorée selon un ou plusieurs des techniques connues de l'homme du métier, telle que distillation, recristallisation, et autres. The amount of chlorides present in the sulfonic acid can be easily controlled and adjusted depending on the nature of the sulfonic acid production process itself, its degree of purity, which can be improved according to one or several techniques known to those skilled in the art, such as distillation, recrystallization, and others.
[0031] En outre, la quantité de chlorures présente dans l'acide sulfonique peut être aisément contrôlée et ajustée en fonction de la nature du ou des éventuels solvants, additifs et charges qui y sont ajoutés. L'homme du métier comprendra aisément qu'un acide sulfonique à faible teneur en chlorures, verra cette teneur augmentée, s'il est décidé par exemple de diluer ledit acide sulfonique dans une eau à forte concentration en chlorure ou encore d'ajouter une charge tel qu'un sel contenant des chlorures.  In addition, the amount of chlorides present in the sulfonic acid can be easily controlled and adjusted depending on the nature of the potential solvent (s), additives and fillers added thereto. Those skilled in the art will readily understand that a sulphonic acid with a low chloride content will see this content increased, if it is decided, for example, to dilute said sulphonic acid in water with a high concentration of chloride or to add a charge. such as a salt containing chlorides.
[0032] L'acide sulfonique faible corrosion selon la présente invention présente ainsi une couleur APHA est inférieure à 20, de préférence inférieure à 15, plus particulièrement inférieure à 10, tout particulièrement inférieure à 5, c'est-à-dire une absence ou quasi absence de couleur, qui permet de disposer d'une acide sulfonique faible corrosion répondant ainsi à la plupart voire la totalité des spécifications commerciales, dans un très grand nombre de domaines d'application. The low-corrosion sulfonic acid according to the present invention thus has an APHA color is less than 20, preferably less than 15, more particularly less than 10, especially less than 5, that is to say a absence or almost no color, which makes it possible to have a low-corrosion sulfonic acid, thus satisfying most or all commercial specifications, in a very large number of fields of application.
[0033] La présente invention concerne également une composition comprenant au moins un acide sulfonique tel que défini ci-dessus, un solvant tel que défini ci- dessus, de préférence l'eau, et éventuellement un ou plusieurs additif(s) et/ou charge(s) tels que définis ci-dessus. The present invention also relates to a composition comprising at least one sulphonic acid as defined above, a solvent as defined above, preferably water, and optionally one or more additive (s) and / or load (s) as defined above.
[0034] L'invention sera mieux comprise à l'aide des exemples qui suivent, lesdits exemples n'étant en aucun limitatifs et servant uniquement à illustrer l'invention.  The invention will be better understood with the aid of the following examples, said examples being in no way limiting and serving only to illustrate the invention.
EXEMPLES EXAMPLES
[0035] Dans un ballon tricol de 250 mL, sont introduits, sous agitation (400 rpm) à 20°C, 135 g d'acide méthane-sulfonique à 70% (c'est-à-dire dilué à 70% en poids dans l'eau). La solution obtenue contient un ratio molaire chlorures/AMS égal à 27 ppm.  In a 250 ml three-necked flask, stirring (400 rpm) at 20 ° C., 135 g of 70% methanesulphonic acid (that is to say diluted to 70% by weight) are introduced. in water). The solution obtained contains a chloride / AMS molar ratio equal to 27 ppm.
[0036] À partir de cet acide méthane-sulfonique (AMS), contenant déjà un ratio chlorures/AMS de 27 ppm, sont préparés 3 échantillons différents contenant des ratios molaires variables chlorures/AMS. Pour cela, des solutions de chlorure, sous forme d'acide chlorhydrique 0,1 N, sont ensuite ajoutées dans la solution d'acide méthane-sulfonique de départ.  From this methanesulfonic acid (AMS), already containing a chloride / AMS ratio of 27 ppm, are prepared 3 different samples containing variable chlorides / AMS molar ratios. For this, chloride solutions, in the form of 0.1 N hydrochloric acid, are then added to the starting methanesulfonic acid solution.
[0037] On obtient ainsi quatre échantillons avec des taux en chlorures variables : Four samples are thus obtained with variable chloride levels:
- échantillon 1 : ratio molaire chlorures/AMS égal à 27 ppm (aucun chlorure ajouté)sample 1: chloride / AMS molar ratio equal to 27 ppm (no added chloride)
- échantillon 2 : ratio molaire chlorures/AMS égal à 66 ppm sample 2: chloride / AMS molar ratio equal to 66 ppm
- échantillon 3 : ratio molaire chlorures/AMS égal à 100 ppm  sample 3: chloride / AMS molar ratio equal to 100 ppm
- échantillon 4 : ratio molaire chlorures/AMS égal à 220 ppm.  sample 4: chloride / AMS molar ratio equal to 220 ppm.
[0038] À l'aide d'une pipette automatique, on ajoute ensuite pendant 1 mn, dans chaque échantillon, 0,24 mL (soit 0,30375 g) de NaNO2 40% (c'est-à-dire dilué à 40% en poids dans l'eau) (soit 0,1215 g de NaNO2 pur). Le ratio molaire NaNO2/AMS est de 1800 ppm. With the aid of an automatic pipette, 0.24 ml (ie 0.30375 g) of 40% NaNO 2 (that is to say, diluted at 40% by weight in water) (ie 0.1215 g of pure NaNO2). The molar ratio NaNO 2 / AMS is 1800 ppm.
[0039] Le ballon est immédiatement refermé de manière hermétique et l'ensemble est placé sous agitation (400 rpm) pendant 1 heure à 20°C. De l'azote est ensuite mis à barboter dans la solution (débit 10 mL.mn"1) pendant 360 mn. [0040] La couleur de chaque échantillon est alors mesurée à l'aide d'un colorimètre LICO 620 de la société HACH, avec gamme étalon entre 0 et 200 APHA. L'appareil est préalablement étalonné avec des solutions étalons allant de 0 à 200 APHA. Un échantillon de 4 mL de la solution dont on veut déterminer la couleur est introduit dans une cuvette fournie par Hach et la lecture de la couleur se fait automatiquement sur l'appareil. The flask is immediately closed hermetically and the whole is placed under agitation (400 rpm) for 1 hour at 20 ° C. Nitrogen is then bubbled into the solution (flow rate 10 mL.mn- 1 ) for 360 minutes. The color of each sample is then measured using a colorimeter LICO 620 from the company HACH, with a standard range between 0 and 200 APHA. The apparatus is previously calibrated with standard solutions ranging from 0 to 200 APHA. A sample of 4 mL of the solution whose color is to be determined is introduced into a cuvette provided by Hach and the color is read automatically on the device.
[0041] Les résultats sont rassemblés dans le Tableau 1 ci-dessous :  The results are summarized in Table 1 below:
-- Tableau 1 -- - Table 1 -
[0042] On considère qu'il y a absence de coloration lorsque la valeur mesurée de couleur APHA est inférieure à 20. Ainsi, on constate que pour un ratio chlorures/AMS inférieur ou égal à 200 ppm, le mélange AMS/inhibiteur est incolore, alors que pour un ratio chlorures/AMS égal à 220 ppm, la valeur APHA est supérieure à 20 et la 'acide méthane-sulfonique est coloré. It is considered that there is no color when the measured APHA color value is less than 20. Thus, it is found that for a chlorides / AMS ratio less than or equal to 200 ppm, the AMS / inhibitor mixture is colorless , while for a chlorides / AMS ratio equal to 220 ppm, the APHA value is greater than 20 and the methanesulfonic acid is colored.
[0043] Il existe donc une corrélation entre le taux de chlorures dans un acide sulfonique contenant un inhibiteur de corrosion, sous forme de nitrites : plus le taux de chlorures est faible, moins la solution est colorée, voire être considérée comme incolore dans de nombreuses spécifications commerciales. There is therefore a correlation between the level of chlorides in a sulfonic acid containing a corrosion inhibitor, in the form of nitrites: the lower the chloride level, the less the solution is colored, or even be considered colorless in many commercial specifications.
Mesure des chlorures dans un acide sulfonique : Measuring chlorides in a sulfonic acid:
[0044] La mesure de la quantité de chlorures présente dans un acide sulfonique est effectuée par argentimétrie à l'aide d'un potentiomètre équipé d'une électrode au sulfure d'argent commercialisée par la société Metrohm AG sous la référence 6.0404.100.  The measurement of the amount of chlorides present in a sulfonic acid is carried out by argentimetry using a potentiometer equipped with a silver sulfide electrode sold by the company Metrohm AG under the reference 6.0404.100.
[0045] On pèse précisément 35 g d'acide sulfonique dans un bêcher contenant assez d'acétone pour pouvoir immerger l'électrode, et on titre avec une solution de nitrate d'argent 0,005 N dans l'acide acétique. La quantité (Qci) de chlorures (en ppm massiques) est exprimée par la formule suivante : Qc| _ Volume AgNOs (mL) x N AgNOs (m équivalenl/mL) x 35500 We weigh precisely 35 g of sulfonic acid in a beaker containing enough acetone to immerse the electrode, and titrated with a solution of 0.005 N silver nitrate in acetic acid. The quantity (Qci) of chlorides (in mass ppm) is expressed by the following formula: Qc | AgNOs volume (mL) x N AgNOs (m equivalents / mL) x 35500
poids de l'échantillon (gramme)  sample weight (gram)
Mesure des nitrites dans un acide sulfonique : Measurement of nitrites in a sulfonic acid:
[0046] Les nitrites peuvent être dosés selon toute méthode connue de l'homme du métier et par exemple par chromatographie ionique.  Nitrites can be determined by any method known to those skilled in the art and for example by ion chromatography.
[0047] Les échantillons à tester sont dilués, environ 150 fois (0,6 g d'échantillon puis complément à 100 mL avec de l'eau ultra-pure) et passés sur un appareil ICS5000 de la société Dionex™. Le mode de détection est la conductimétrie et les résultats sont lus par rapport à une courbe d'étalonnage préalablement établie.  The samples to be tested are diluted approximately 150 times (0.6 g of sample and then 100 ml supplement with ultrapure water) and passed on an ICS5000 device from the company Dionex ™. The detection mode is the conductimetry and the results are read against a previously established calibration curve.
[0048] La gamme d'étalonnage est préparée à partir d'étalons de nitrites, ainsi que d'une matrice AMS. Les étalons commerciaux de nitrites (1000 mg.L"1 dans l'eau, fournisseur CPA). On prépare des solutions à 1 , 10 et 100 mg.L"1 en les diluants dans l'eau ultra pure. The calibration range is prepared from standards of nitrites, as well as an AMS matrix. Commercial standards of nitrites (1000 mg.L -1 in water, supplier CPA) 1, 10 and 100 mg.L "1 solutions are prepared by diluting them in ultra pure water.
[0049] La matrice AMS est réalisée à partir d'une solution commerciale d'AMS à 70% (Sigma-AIdrich) dilué dans l'eau ultra pure. Pour ce faire, on pèse 0,6 g d'AMS 70% dans une fiole jaugée de 100 mL, puis on complète avec de l'eau ultra pure.  The AMS matrix is made from a commercial solution of 70% AMS (Sigma-Aldrich) diluted in ultra pure water. To do this, 0.6 g of 70% AMS is weighed into a 100 ml volumetric flask, and then complete with ultra pure water.
PROTOCOLE DE TEST DE VALIDATION « FAIBLE CORROSION » "LOW CORROSION" VALIDATION TEST PROTOCOL
[0050] Afin de vérifier la qualité « faible corrosion », au sens de la présente invention, d'un acide sulfonique, on réalise un essai d'électrochimie à l'aide d'un montage à 3 électrodes connectées sur un potentiostat BIOLOGIC VMP3 : In order to check the "low corrosion" quality, within the meaning of the present invention, of a sulphonic acid, an electrochemical test is carried out using a 3-electrode assembly connected to a BIOLOGIC VMP3 potentiostat. :
1 ) électrode de référence : électrode au calomel saturé ou « ECS »,  1) reference electrode: saturated calomel electrode or "ECS",
2) électrode de travail : éprouvette en acier inoxydable 304L de taille 1 cm2, et2) working electrode: 304L stainless steel test specimen of size 1 cm 2 , and
3) contre électrode en platine. 3) against platinum electrode.
[0051] L'éprouvette du matériau à tester est polie au papier abrasif P400 puis passivée pendant 1 heure dans une solution d'acide nitrique 10% à température ambiante. Ceci permet un état de départ identique pour tous les essais. La température de l'essai est thermostatée à 20°C ± 2°C.  The test piece of the material to be tested is polished with abrasive paper P400 and then passivated for 1 hour in a 10% nitric acid solution at room temperature. This allows an identical starting state for all tests. The temperature of the test is thermostated at 20 ° C ± 2 ° C.
[0052] Le protocole appliqué comporte les trois étapes suivantes : The applied protocol comprises the following three steps:
a) suivi du potentiel d'abandon de l'électrode de travail (304L) dans l'acide sulfonique additivé selon le procédé de la présente invention, c'est-à-dire mesure du potentiel du matériau dans la solution en fonction du temps, pendant 30 minutes, a) monitoring the abandoning potential of the working electrode (304L) in the additive-containing sulfonic acid according to the method of the present invention, ie measuring the potential of the material in the solution as a function of time, for 30 minutes,
b) immersion du système à trois électrodes dans une solution d'acide sulfonique standard (i.e. non additivé), puis application à l'électrode de travail d'un courant de -800 μΑ.αττ2 pendant 1 minute afin de dépassiver le matériau de manière artificielle en fixant le potentiel de celui-ci dans le domaine de corrosion, c) immersion du système à trois électrodes à nouveau dans la solution d'acide sulfonique additivé selon le procédé de la présente invention, et suivi à nouveau du potentiel d'abandon de l'électrode de travail, jusqu'à stabilisation de celui-ci. b) immersion of the three electrode system in a standard sulfonic acid solution (ie not additive), then application to the working electrode of a current of -800 μΑ.αττ 2 for 1 minute in order to exceed the material of artificially by setting the potential thereof in the area of corrosion, c) immersion of the three-electrode system again in the sulfonic acid solution additive according to the method of the present invention, and followed again the potential of abandonment of the working electrode, until stabilization thereof.
RÉSULTATS DU TEST DE VALIDATION RESULTS OF THE VALIDATION TEST
[0053] Dans le cas d'un acide méthane-sulfonique standard, c'est-à-dire non additivé, en solution à 70% en poids dans l'eau, après application d'une quantité de courant de -800 μΑ.αττ2, le potentiel de l'électrode de travail (éprouvette en acier inoxydable 304L) chute aux alentours de -350 mV, ce qui correspond au passage de l'inox 304L a l'état actif. Lorsque l'application du courant est stoppée, le potentiel du matériau reste quasiment au même niveau et ne remonte pas. L'inox 304L reste à l'état actif et se corrode. In the case of a standard methanesulfonic acid, that is to say not additive, in solution at 70% by weight in water, after application of a current amount of -800 μΑ. αττ 2 , the potential of the working electrode (304L stainless steel test specimen) drops to around -350 mV, which corresponds to the passage of stainless steel 304L in the active state. When the application of the current is stopped, the potential of the material remains almost at the same level and does not rise. 304L stainless steel remains active and corrodes.
[0054] Le comportement est totalement différent dans une solution à 70% en poids dans l'eau d'un acide méthane-sulfonique additivé de nitrites.  The behavior is completely different in a 70% solution by weight in water of a methanesulfonic acid additive nitrites.
[0055] On note tout d'abord un potentiel à l'abandon de l'inox 304L de l'ordre de 750 mV après 30 minutes. Lors de l'application du courant de -800 μΑ.αττ2, le potentiel du matériau chute aux alentours de -200 mV (passage de l'inox 304L à l'état actif). Lorsque l'on arrête l'application du courant, le potentiel du matériau remonte très rapidement. Il est de 780 mV après 2 heures de suivi de potentiel et on note une absence totale de corrosion. We first note a potential abandonment 304L stainless steel of the order of 750 mV after 30 minutes. When applying the current of -800 μΑ.αττ 2 , the potential of the material drops to around -200 mV (passage of stainless steel 304L in the active state). When the application of the current is stopped, the potential of the material rises very rapidly. It is 780 mV after 2 hours of potential monitoring and there is a total absence of corrosion.
[0056] Dans tous les cas (échantillons 1 , 2, 3 et 4 ci-dessus), l'acide méthane- sulfonique additivé par le nitrite de sodium est un acide méthane-sulfonique faible corrosion au sens de la présente invention.  In all cases (samples 1, 2, 3 and 4 above), methanesulfonic acid added with sodium nitrite is a weak methane-sulfonic acid corrosion in the sense of the present invention.

Claims

REVENDICATIONS
1. Acide sulfonique comprenant : A sulfonic acid comprising:
un ratio molaire chlorure/acide sulfonique compris entre 1 ppm et 200 ppm, de préférence entre 5 ppm et 200 ppm, de préférence encore entre 10 ppm et 200 ppm, plus préférentiellement entre 10 ppm et 190 ppm, bornes incluses, et  a chloride / sulphonic acid molar ratio of between 1 ppm and 200 ppm, preferably between 5 ppm and 200 ppm, more preferably between 10 ppm and 200 ppm, more preferably between 10 ppm and 190 ppm, limits included, and
un ratio molaire nitrite/acide sulfonique compris entre 200 ppm et 6000 ppm, de préférence entre 400 ppm et 2000 ppm, particulièrement entre 500 ppm et 1900 ppm, bornes incluses,  a molar nitrite / sulfonic acid ratio of between 200 ppm and 6000 ppm, preferably between 400 ppm and 2000 ppm, particularly between 500 ppm and 1900 ppm, limits included,
et dont la couleur APHA est inférieure à 20, de préférence inférieure à 15, plus particulièrement inférieure à 10, tout particulièrement inférieure à 5. and whose APHA color is less than 20, preferably less than 15, more preferably less than 10, most preferably less than 5.
2. Acide sulfonique selon la revendication 1 choisi parmi les acides sulfoniques de formule R-SO3H, où R représente une chaîne hydrocarbonée saturée ou insaturée, linéaire, ramifiée ou cyclique, comportant de 1 à 12 atomes de carbone, substituée ou non substituée par un ou plusieurs radicaux et/ou atomes choisis parmi les atomes d'halogène, les radicaux alkyles contenant de 1 à 6 atomes de carbone et les radicaux aryles et hétéroaryles à 6 ou 10 chaînons. 2. Sulfonic acid according to claim 1, chosen from sulphonic acids of formula R-SO3H, where R represents a saturated or unsaturated, linear, branched or cyclic hydrocarbon-based chain containing from 1 to 12 carbon atoms, substituted or unsubstituted by a or more radicals and / or atoms selected from halogen atoms, alkyl radicals containing 1 to 6 carbon atoms and aryl and heteroaryl radicals with 6 or 10 members.
3. Acide sulfonique selon l'une quelconque des revendications 1 ou 2, choisi parmi l'acide méthane-sulfonique, l'acide éthane-sulfonique, l'acide n-propane- sulfonique, l'acide /'so-propane-sulfonique, l'acide n-butane-sulfonique, l'acide iso- butane-sulfonique, l'acide sec-butane-sulfonique, l'acide terf-butane-sulfonique, l'acide trifluorométhanesulfonique, l'acide para-toluènesulfonique, l'acide benzènesulfonique, l'acide naphtalènesulfonique et les mélanges de deux ou plusieurs d'entre eux en toutes proportions. 3. sulfonic acid according to any one of claims 1 or 2, selected from methanesulfonic acid, ethanesulfonic acid, n-propane sulfonic acid, / 'n-propane-sulfonic , n-butanesulfonic acid, isobutanesulfonic acid, sec-butanesulfonic acid, tert-butanesulfonic acid, trifluoromethanesulfonic acid, para-toluenesulfonic acid, benzenesulphonic acid, naphthalenesulphonic acid and mixtures of two or more of them in all proportions.
4. Acide sulfonique selon l'une quelconque des revendications 1 à 3, choisi parmi l'acide méthane-sulfonique, l'acide éthane-sulfonique, l'acide trifluorométhanesulfonique et l'acide para-toluènesulfonique, de préférence l'acide sulfonique est l'acide méthane-sulfonique. 4. Sulfonic acid according to any one of claims 1 to 3, selected from methanesulfonic acid, ethanesulfonic acid, trifluoromethanesulfonic acid and para-toluenesulfonic acid, preferably the sulfonic acid is methanesulfonic acid.
5. Acide sulfonique selon l'une quelconque des revendications 1 à 4 en milieu solvanté, ledit solvant pouvant être l'eau ou un solvant organique ou un mélange de solvants organiques, ou encore de l'eau en mélange avec un ou plusieurs autres solvants organiques. 5. sulfonic acid according to any one of claims 1 to 4 in a solvent medium, said solvent may be water or an organic solvent or a mixture of organic solvents, or water in mixture with one or more other solvents organic.
6. Acide sulfonique selon l'une quelconque des revendications 1 à 5 en mélange avec un ou plusieurs additifs et/ou charges choisi parmi les modificateurs de viscosité ou de rhéologie, les agents moussants, les agents anti-moussants, les surfactants, les désinfectants, les biocides, les stabilisateurs, les agents oxydants, les enzymes, les pigments, les colorants, les ignifugeants, les agents retardateurs de flamme, les parfums et les arômes. 6. Sulfonic acid according to any one of claims 1 to 5 in admixture with one or more additives and / or fillers chosen from viscosity or rheology modifiers, foaming agents, anti-foaming agents, surfactants, disinfectants. , biocides, stabilizers, oxidizing agents, enzymes, pigments, dyes, flame retardants, flame retardants, perfumes and flavorings.
7. Composition comprenant au moins un acide sulfonique selon l'une quelconque des revendications 1 à 4, un solvant, et éventuellement un ou plusieurs additif(s) et/ou charge(s). 7. Composition comprising at least one sulfonic acid according to any one of claims 1 to 4, a solvent, and optionally one or more additive (s) and / or filler (s).
EP18773237.5A 2017-09-01 2018-08-30 Weakly coloured sulfonic acid Pending EP3676245A1 (en)

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